SIST EN ISO 11148-6:2013

SLOVENSKI STANDARD
01-maj-2013
1DGRPHãþD
SIST EN ISO 11148-6:2011
1HHOHNWULþQDURþQDRURGMD9DUQRVWQH]DKWHYHGHO2URGMD]DYLMDþQH]YH]H
,62
Hand-held non-electric power tools - Safety requirements - Part 6: Assembly power tools
for threaded fasteners (ISO 11148-6:2012)
Handgehaltene nicht elektrisch betriebene Maschinen - Sicherheitsanforderungen - Teil
6: Maschinen für Schraubverbindungen (ISO 11148-6:2012)
Machines portatives à moteur non électrique - Exigences de sécurité - Partie 6:
Machines d'assemblage pour éléments de fixation filetés (ISO 11148-6:2012)
Ta slovenski standard je istoveten z: EN ISO 11148-6:2012
ICS:
25.140.10 3QHYPDWLþQDRURGMD Pneumatic tools
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN ISO 11148-6
NORME EUROPÉENNE
EUROPÄISCHE NORM
December 2012
ICS 25.140.10 Supersedes EN ISO 11148-6:2010
English Version
Hand-held non-electric power tools - Safety requirements - Part
6: Assembly power tools for threaded fasteners (ISO 11148-
6:2012)
Machines portatives à moteur non électrique - Exigences Handgehaltene nicht elektrisch betriebene Maschinen -
de sécurité - Partie 6: Machines d'assemblage pour Sicherheitsanforderungen - Teil 6: Maschinen für
éléments de fixation filetés (ISO 11148-6:2012) Schraubverbindungen (ISO 11148-6:2012)
This European Standard was approved by CEN on 17 December 2012.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national
standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same
status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United
Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2012 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 11148-6:2012: E
worldwide for CEN national Members.

Contents Page
Foreword . 3
Annex ZA (informative) Relationship between this European Standard and the Essential
Requirements of EU Directive 2006/42/EC . 4

Foreword
This document (EN ISO 11148-6:2012) has been prepared by Technical Committee ISO/TC 118
"Compressors and pneumatic tools, machines and equipment" in collaboration with Technical Committee
CEN/TC 255 “Hand-held, non-electric power tools - Safety” the secretariat of which is held by SIS.
This European Standard shall be given the status of a national standard, either by publication of an identical
text or by endorsement, at the latest by June 2013, and conflicting national standards shall be withdrawn at
the latest by June 2013.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN ISO 11148-6:2010.
This document has been prepared under a mandate given to CEN by the European Commission and the
European Free Trade Association, and supports essential requirements of EU Directive(s).
For relationship with EU Directive(s), see informative Annex ZA, which is an integral part of this document.
According to the CEN/CENELEC Internal Regulations, the national standards organisations of the following
countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech
Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece,
Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.
Endorsement notice
The text of ISO 11148-6:2012 has been approved by CEN as a EN ISO 11148-6:2012 without any
modification.
Annex ZA
(informative)
Relationship between this European Standard and the Essential
Requirements of EU Directive 2006/42/EC
This European Standard has been prepared under a mandate given to CEN by the European Commission
and the European Free Trade Association to provide a means of conforming to Essential Requirements of the
New Approach Directive 2006/42/EC on machinery.
Once this standard is cited in the Official Journal of the European Union under that Directive and has been
implemented as a national standard in at least one Member State, compliance with the clauses of this
standard confers, within the limits of the scope of this standard, a presumption of conformity with the
corresponding Essential Requirements of that Directive and associated EFTA regulations.
WARNING — Other requirements and other EU Directives may be applicable to the product(s) falling
within the scope of this standard.

INTERNATIONAL ISO
STANDARD 11148-6
Second edition
2012-12-15
Hand-held non-electric power tools —
Safety requirements —
Part 6:
Assembly power tools for threaded
fasteners
Machines portatives à moteur non électrique — Exigences de sécurité —
Partie 6: Machines d’assemblage pour éléments de fixation filetés
Reference number
ISO 11148-6:2012(E)
©
ISO 2012
ISO 11148-6:2012(E)
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means,
electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISO’s
member body in the country of the requester.
ISO copyright office
Case postale 56 • CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail copyright@iso.org
Web www.iso.org
Published in Switzerland
ii © ISO 2012 – All rights reserved

ISO 11148-6:2012(E)
Contents Page
Foreword .iv
Introduction . v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
3.1 General definitions . 2
3.2 Definitions related to assembly power tools for threaded fasteners . 4
4 Safety requirements and/or protective measures . 5
4.1 General . 5
4.2 Mechanical safety . 5
4.3 Thermal safety . 6
4.4 Noise reduction . 6
4.5 Vibration . 6
4.6 Materials and substances processed, used or exhausted . 7
4.7 Ergonomics . 7
4.8 Controls . 9
5 Verification .10
5.1 General conditions for tests .10
5.2 Noise .10
5.3 Vibration .10
5.4 Unintentional start .10
5.5 Power tool construction .10
5.6 Structure of verification of safety requirements . 11
6 Information for use . 11
6.1 Marking, signs and written warnings . 11
6.2 Instructions handbook .12
6.3 Operating instructions .17
6.4 Data .17
6.5 Maintenance instructions .18
Annex A (informative) List of significant hazards .19
Annex B (informative) Examples of assembly power tools for threaded fasteners covered by this part of
ISO 11148 .21
Annex C (normative) Symbols for labels and signs.23
Annex D (normative) Additional safety requirements related to internal combustion engine
power tools .25
Bibliography .29
ISO 11148-6:2012(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
(ISO member bodies). The work of preparing International Standards is normally carried out through ISO
technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International
Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 11148-6 was prepared by Technical Committee ISO/TC 118, Compressors and pneumatic tools, machines
and equipment, Subcommittee SC 3, Pneumatic tools and machines.
This second edition cancels and replaces the first edition (ISO 11148-6:2010), of which it constitutes a minor revision.
ISO 11148 consists of the following parts, under the general title Hand-held non-electric power tools — Safety
requirements:
— Part 1: Assembly power tools for non-threaded mechanical fasteners
— Part 2: Cutting-off and crimping power tools
— Part 3: Drills and tappers
— Part 4: Non-rotary percussive power tools
— Part 5: Rotary percussive drills
— Part 6: Assembly power tools for threaded fasteners
— Part 7: Grinders
— Part 8: Sanders and polishers
— Part 9: Die grinders
— Part 10: Compression power tools
— Part 11: Nibblers and shears
— Part 12: Circular, oscillating and reciprocating saws
A part 13, dealing with fastener driving tools, is under preparation.
iv © ISO 2012 – All rights reserved

ISO 11148-6:2012(E)
Introduction
This document is a type C standard as stated in ISO 12100.
The machinery concerned and the extent to which hazards, hazardous situations and events are covered are
defined in the Scope of this part of ISO 11148.
When provisions of this type C standard are different from those that are stated in type A or B standards, the
requirements of this type C standard take precedence over the requirements of other standards for machines
that have been designed and built according to the requirements of this type C standard.
ISO 11148 consists of a number of independent parts for individual types of hand-held, non-electric power tools.
Certain elements of this part of ISO 11148 cover hand-held, non-electric power tools driven by internal
combustion engines powered by gaseous or liquid fuel. In these parts, the safety aspects relating to internal
combustion engines are found in a normative annex.
The parts are type C standards and refer to pertinent standards of types A and B where such standards are applicable.
INTERNATIONAL STANDARD ISO 11148-6:2012(E)
Hand-held non-electric power tools — Safety requirements —
Part 6:
Assembly power tools for threaded fasteners
IMPORTANT — The electronic file of this document contains colours that are considered useful for the
correct understanding of the document. Users should consider printing this document using a colour
printer. ISO 3864-4 provides colourimetric and photometric properties together with, as a guideline,
references from colour order systems.
1 Scope
This part of ISO 11148 applies to hand-held non-electric power tools (hereinafter “assembly power tools for
threaded fasteners”) intended for tightening or installing of threaded fasteners. The assembly power tools for
threaded fasteners can be powered by compressed air, hydraulic fluid or internal combustion engines and are
intended for use by one operator and supported by the operator’s hand or hands, with or without a suspension,
e.g. a balancer.
This part of ISO 11148 covers
— air-hydraulic impulse wrenches;
— impact wrenches;
— fastener installation tools;
— nutrunners;
— open-ended spanners (crow-foot with open-ended socket or tube nut wrench);
— ratchet wrenches;
— screwdrivers.
NOTE 1 For examples of assembly power tools for threaded fasteners, see Annex B.
This part of ISO 11148 does not cover special requirements and modifications of assembly power tools for
threaded fasteners for the purpose of mounting them in fixtures.
This part of ISO 11148 deals with all significant hazards, hazardous situations or hazardous events when
the tools are used as intended and under conditions of misuse which are reasonably foreseeable by the
manufacturer, with the exception of the use of assembly power tools for threaded fasteners in potentially
explosive atmospheres.
NOTE 2 EN 13463-1 gives requirements for non-electrical equipment for potentially explosive atmospheres.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced document
(including any amendments) applies.
ISO 3857-3, Compressors, pneumatic tools and machines — Vocabulary — Part 3: Pneumatic tools and machines
ISO 3864-2, Graphical symbols — Safety colours and safety signs — Part 2: Design principles for product
safety labels
ISO 11148-6:2012(E)
ISO 5391, Pneumatic tools and machines — Vocabulary
1)
ISO 7000, Graphical symbols for use on equipment — Registered symbols
1)
ISO 7010, Graphical symbols — Safety colours and safety signs — Registered safety signs
ISO 9158, Road vehicles — Nozzle spouts for unleaded gasoline
ISO 9159, Road vehicles — Nozzle spouts for leaded gasoline and diesel fuel
ISO 12100:2010, Safety of machinery — General principles for design — Risk assessment and risk reduction
ISO 13732-1, Ergonomics of the thermal environment — Methods for the assessment of human responses to
contact with surfaces — Part 1: Hot surfaces
ISO 13732-3, Ergonomics of the thermal environment — Methods for the assessment of human responses to
contact with surfaces — Part 3: Cold surfaces
ISO 15744, Hand-held non-electric power tools — Noise measurement code — Engineering method (grade 2)
ISO 17066, Hydraulic tools — Vocabulary
ISO 20643, Mechanical vibration — Hand-held and hand-guided machinery — Principles for evaluation of
vibration emission
ISO 28927-2, Hand-held portable power tools — Test methods for evaluation of vibration emission — Part 2:
Wrenches, nutrunners and screwdrivers
EN 12096, Mechanical vibration — Declaration and verification of vibration emission values
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 3857-3, ISO 5391, ISO 12100 and
ISO 17066 (for hydraulic tools), and the following apply.
3.1 General definitions
3.1.1
hand-held power tool
machine operated by one or two hands and driven by rotary or linear motors powered by compressed air,
hydraulic fluid, gaseous or liquid fuel, electricity or stored energy (e.g. by a spring) to do mechanical work and so
designed that the motor and the mechanism form an assembly that can easily be brought to its place of operation
NOTE Hand-held power tools driven by compressed air or gas are called pneumatic tools (or air tools). Hand-held
power tools driven by hydraulic liquid are called hydraulic tools.
3.1.2
inserted tool
tool inserted in the assembly power tool for threaded fasteners to perform the intended work
3.1.3
service tool
tool intended for performing maintenance or service on the assembly power tool for threaded fasteners
3.1.4
control device
device to start and stop the assembly power tool for threaded fasteners or to change the direction of the
rotation or to control the functional characteristics such as speed and power
1) The graphical symbol collections of ISO 7000, ISO 7001 and ISO 7010 are also available online in the ISO web store.
For more information, consult http://www.iso.org/iso/fr/publications_and_e-products/databases.htm.
2 © ISO 2012 – All rights reserved

ISO 11148-6:2012(E)
3.1.5
start-and-stop device
throttle
manually operated control on the assembly power tool for threaded fasteners by which the energy supply to
the motor can be turned on and off
3.1.6
hold-to-run start-and-stop device
constant-pressure throttle
start-and-stop device that automatically returns to the OFF position when force on the start-and-stop device
actuator is released
3.1.7
lock-on start-and-stop device
constant-pressure throttle with instant release lock
hold-to-run start-and-stop device that can be locked in the ON position and designed so that it permits the
assembly power tool for threaded fasteners to be turned off by a single motion of the same finger or fingers
used to turn it on
3.1.8
lock-off start-and-stop device
lock-off throttle
start-and-stop device that automatically latches in the OFF position when the actuator is released and where
two motions are required to energize the assembly power tool for threaded fasteners
3.1.9
positive on-off start-and-stop device
positive on-off throttle
start-and-stop device that remains in an ON position until it is manually changed
3.1.10
maximum operating pressure
maximum pressure at which an assembly power tool for threaded fasteners may be operated
3.1.11
whip hose
air hose, connecting the main air hose with an air tool for the purpose of providing more flexibility
3.1.12
rated air pressure
air pressure, required at an air tool inlet port to assure rated performance of the tool, also considered the
maximum pressure at which the tool may be operated
3.1.13 Rated speed
3.1.13.1
rated speed
〈pneumatic tool〉 speed of an air tool at no load and rated air pressure at the tool inlet port
NOTE The rated speed is expressed in revolutions per minute.
3.1.13.2
rated speed
〈hydraulic tool〉 nominal speed of a hydraulic tool at no load and rated flow at the tool inlet port
NOTE The rated speed is expressed in revolutions per minute.
3.1.14
maximum attainable speed
maximum speed which the tool can achieve under the most adverse condition of possible maladjustment or
malfunction of its speed control devices, when supplied with compressed air at the pressure marked on the
assembly power tool for threaded fasteners
ISO 11148-6:2012(E)
3.1.15
suspension device
device, which is attached to the tool, whose primary purpose is to reduce the strain on the operator caused by
the weight of the tool
NOTE The device may also have a secondary purpose of transmitting a reaction torque.
3.2 Definitions related to assembly power tools for threaded fasteners
3.2.1
screwdriver
rotary, reversible or non-reversible, power tool driving a spindle fitted with a screwdriver bit
NOTE Screwdrivers can be straight, pistol-grip or angle types, and might or might not have a clutch; these terms are
defined in ISO 5391.
3.2.2
nutrunner
rotary, reversible or non-reversible, power tool, incorporating a socket adapter for the tightening of nuts and bolts
NOTE Nutrunners can be pistol-grip or angle-drive types, and might or might not have a clutch. This category includes
two-speed and crow-foot nutrunners; these terms are defined in ISO 5391.
3.2.3
impact wrench
percussive rotary power tool fitted with a multi-vane or oscillating motor driving a hammer that periodically
strikes an anvil to tighten nuts and bolts without producing any considerable reaction torque on the tool
NOTE These terms are defined in ISO 5391.
3.2.4
air-hydraulic impulse wrench
power assembly tool fitted with a motor driving a hydraulic impulse mechanism for tightening threaded fasteners,
which applies torque through a hydraulic impulse unit to a fastener in discontinuous increments
NOTE Air-hydraulic impulse wrenches have the same types as impact wrenches; these terms are defined in ISO 5391.
3.2.5
fastener installation tool
screwdriver, having a manual or automatic reverse mechanism and a threaded drive spindle for installing
threaded captive fasteners, which may be straight, pistol-grip or angle-drive type
3.2.6
open-ended spanner
crow-foot with open-ended socket
tube nut wrench
nutrunner or a ratchet wrench with an open-ended socket
3.2.7
ratchet wrench
angle-drive wrench progressively rotating a socket by means of a ratchet and pawl coupling
3.2.8
reaction bar
implement fitted to the hand-held tool to place against a fixed structure of sufficient strength to accept the load
of the reaction torque
3.2.9
sleeve fitting
device for aligning the inserted tool or drive adapter with the axis of rotation of the power tool spindle that can
reduce the vibration caused by misalignment
4 © ISO 2012 – All rights reserved

ISO 11148-6:2012(E)
3.2.10
drive adapter
implement fitted to the hand-held power tool to drive the threaded fastener
EXAMPLE Drive bits and sockets.
4 Safety requirements and/or protective measures
4.1 General
The machine shall comply with the following safety requirements and/or protective measures and be verified in
accordance with Clause 5. In addition, the machine shall be designed in accordance with the principles of ISO 12100
for the relevant, but not necessarily significant, hazards, which are not dealt with by this part of ISO 11148.
The measures adopted to comply with the requirements of Clause 4 shall take account of the state-of-the-art.
It is recognized that optimizing the design with respect to some safety measures can result in a degradation of
performance against other safety requirements. In such cases, it is required to strike a balance between the
various requirements in order to achieve an assembly power tool design that satisfies each requirement, so far
as is reasonably practicable, and remains fit for purpose.
4.2 Mechanical safety
4.2.1 Surfaces, edges and corners
Accessible parts of assembly power tools for threaded fasteners, except the inserted tool, shall not have sharp
edges or angles or rough or abrasive surfaces; see ISO 12100:2010, 6.2.2.1.
4.2.2 Supporting surface and stability
Assembly power tools for threaded fasteners shall be so designed that they can be laid aside and remain in a
stable position on a plane surface.
4.2.3 Hydraulic fluid ejection
Hydraulic systems of the assembly power tool shall be enclosed so as to give protection against high-pressure
fluid ejection.
4.2.4 Guards
Guards covering the drive adaptor and the inserted tool are not required.
4.2.5 Access openings
Openings provided in the assembly power tool for threaded fasteners to allow access to adjusting means shall
be designed to protect the operator from pinching his/her fingers while operating the tool; see ISO 13857.
4.2.6 Socket retainer
The socket retainer shall be designed and used so that it retains the socket on the output shaft while the
assembly power tool for threaded fasteners is operating. Loose pin retainers shall have a positive means of
retaining the pin.
4.2.7 Power tool construction
The assembly power tool for threaded fasteners shall be designed and constructed so as to prevent the
loosening or loss of components during expected use, including rough handling and occasional dropping,
which can compromise its safety functions. Verification shall be made in accordance with 5.5.
ISO 11148-6:2012(E)
4.3 Thermal safety
Surface temperatures of parts of the assembly power tools for threaded fasteners that are held during use or
that can be inadvertently touched shall follow the provisions of ISO 13732-1 and ISO 13732-3.
Pneumatic tools shall be designed to avoid the cooling effects of exhaust air on the handles and other gripping zones.
4.4 Noise reduction
The assembly power tool for threaded fasteners shall be designed and constructed so that the emission of noise
is reduced to the lowest level, taking account of technical progress and the availability of means of reducing
noise, in particular at the source. Principles for designing assembly power tools for threaded fasteners with
reduced noise emission are contained in ISO/TR 11688-1 and ISO/TR 11688-2.
The noise emission from using assembly power tools for threaded fasteners has three main sources:
— the assembly power tool for threaded fasteners itself;
— the inserted tool;
— the workpiece.
NOTE Generally, the noise emitted due to the characteristics of the workpiece cannot be controlled directly by the
manufacturer of the assembly power tool for threaded fasteners.
Typical sources of noise emitted by the assembly power tool for threaded fasteners itself are
a) the motor and drive mechanism;
b) the exhaust air or gases;
c) vibration- or impact-induced noise.
Where the exhaust air or gases are the major contributor to the noise, means to reduce the noise, for example
a silencer or equivalent means, shall be included in the design.
Alternatively, where practicable, the exhaust air or gases can be piped away from the operator in a hose.
Vibration-induced noise can often be reduced by vibration isolation and damping.
This list is not exhaustive; where alternative technical measures for noise reduction, with greater efficiency, are
available, they should be used by the manufacturer.
4.5 Vibration
The assembly power tool for threaded fasteners shall be designed and constructed so that the vibration is
reduced to the lowest level at the handles and at any other parts of the tool in contact with the operator’s
hands, taking account of technical progress and the availability of means of reducing vibration, in particular at
source. Principles for designing assembly power tools for threaded fasteners with reduced vibration emission
are contained in CR 1030-1.
Typical sources of vibration emitted by an assembly power tool for threaded fasteners are
— unbalance of rotating parts;
— poorly designed motors and gears;
— resonances in the structure of the machine, particularly the handles and their mounts.
The following design features have been found effective and should be considered by manufacturers when
designing assembly power tools for threaded fasteners:
a) autobalancers;
6 © ISO 2012 – All rights reserved

ISO 11148-6:2012(E)
b) increasing inertia;
c) isolated casing or handles;
d) in the case of impulse wrenches, the socket interface should be dimensioned as recommended by
ISO/TS 21108.
This list is not exhaustive; where alternative technical measures for vibration reduction, with greater efficiency,
are available, they should be used by the manufacturer.
4.6 Materials and substances processed, used or exhausted
4.6.1 Exhaust air or gas
Assembly power tools for threaded fasteners driven with compressed air or gas or an internal combustion
engine shall be designed in such a way that exhaust air or gases are directed so as not to cause a hazard to
the operator and so that any other effects, such as blowing the dust and reflected air or gas from the workpiece
onto the operator, are minimized.
4.6.2 Lubricants
When specifying lubricants, the manufacturer shall take environmental and occupational health aspects into account.
4.7 Ergonomics
4.7.1 Design of the handle
Gripping areas of the assembly power tools for threaded fasteners shall be designed to provide a convenient,
effective means for the operator to exercise full control over the assembly power tool for threaded fasteners.
Handles and other parts used for gripping the assembly power tool for threaded fasteners shall be designed to
ensure that the operator is able to grip the assembly power tool for threaded fasteners correctly and to perform
the expected work. Handles shall suit the functional anatomy of the hand and the dimensions of the hands of
the operator population.
NOTE Further guidance on ergonomic design principles can be found in EN 614-1.
Assembly power tools for threaded fasteners having a mass greater than 2 kg (including the inserted tool) shall
be capable of being supported by two hands while being lifted or operated.
The grip shall be such that normal feed force and reaction torque can be transmitted in an ergonomic way from
the hand of the operator to the assembly power tool for threaded fasteners.
The strength of a removable handle and the method of fixing it shall be appropriate to the intended principal use.
4.7.2 Suspension device
Provision shall be made, where appropriate, to enable the attachment to the assembly power tool for threaded
fasteners of a suspension device in order to reduce, where practicable, the physical strain placed on the
operator by the weight of the assembly power tool for threaded fasteners. The fitting of a suspension device
shall not introduce an additional hazard.
4.7.3 Reaction torque absorption
Screwdrivers and nutrunners shall be designed to reduce the effect of the reaction torque as much as possible.
The reaction torque can be absorbed by mechanical means, such as support handles, reaction bars or
suspension arms.
Where it is possible to envision that screwdrivers and nutrunners can be used in such a manner that the
operator is required to absorb a harmful reaction torque, provisions shall be made for the attachment of
ISO 11148-6:2012(E)
absorbing devices (support handles, reaction bars). Reaction bars shall be designed to withstand the strain
that can be exerted upon them.
Straight rotary tools shall have provisions for mounting a second handle when the reaction torque absorbed by
the operator can exceed 4 N⋅m.
Pistol-grip tools shall have a provision for mounting a second handle when the reaction torque absorbed by
the operator can exceed 10 N⋅m.
Angle nutrunners shall have provision for mounting a reaction bar when the reaction torque absorbed by the
operator can exceed 60 N⋅m.
NOTE 1 Provision for mounting second handles or reaction bars can be required at values of reaction torque lower
than those indicated above, depending upon factors such as the expected frequency and daily duration of operation, the
physique and posture of the operator, the type of joint and use of accessories, such as extensions.
NOTE 2 Recommended force limits for machinery operation are given in EN 1005.
Figures 1 to 3 show examples of methods (indicated by the arrows in Figures 1 and 2) for absorbing reaction torque.
Figure 1 — Reaction bar
Figure 2 — Support handle
8 © ISO 2012 – All rights reserved

ISO 11148-6:2012(E)
Figure 3 — Suspension arm
4.8 Controls
4.8.1 Start-and-stop device
Assembly power tools for threaded fasteners shall be equipped with a single control device to start or stop
them. It shall be adapted to the handle or to the part of the assembly power tool for threaded fasteners being
gripped, so that the operator can activate it without releasing the grip on the handles.
Start-and-stop devices shall be so designed that the inserted tool ceases to be powered when the start-and-
stop device is released. Without manual effort and when completely released, the device shall move to the stop
position, i.e. shall be of the hold-to-run type.
Start-and-stop devices shall be in the stop position or immediately move to the stop position when the assembly
power tool for threaded fasteners is connected to the energy supply.
It shall not be possible to lock the start-and-stop device in the running position.
There is an exception for assembly power tools for threaded fasteners with a capacity to tighten fasteners
having a thread size of 8 mm or less, which may have a lock-on start-and-stop device.
Start-and-stop devices shall be so positioned or guarded that release cannot be unintentionally or inadvertently
prevented. An example of a suitable position for the control device for angle nutrunners is shown in Figure 4.
Figure 4 — Suitable position for the control device on the upper side of the handle
4.8.2 Unintentional start
The start-and-stop device for open-ended spanners shall be so designed, positioned or guarded that the risk
of unintentional start is minimized. Verification shall be made according to 5.4.
Open-ended spanners shall have a lock-off throttle.
ISO 11148-6:2012(E)
4.8.3 Actuating forces
For assembly power tools for threaded fasteners that are intended for frequent starts or for use with precision
work, the actuating force shall be small.
For assembly power tools for threaded fasteners that are normally used in operations of long duration, the force
to keep the start device in the run position should be small.
NOTE For further information on trigger forces for control devices, see EN 894-3.
4.8.4 Directional control devices
An assembly power tool for threaded fasteners starting in an unintended direction can be hazardous due to the
unexpected direction of the assembly power tool’s movement. If it is possible for the assembly power tool for
threaded fasteners to start in the reverse direction, the positions of the control device that control the forward
and the reverse movements shall be clearly marked by arrows showing the rotational direction of the spindle.
Forward is defined as the direction of rotation of the inserted tool that tightens a right-hand threaded fastener.
Examples of indicating the mode of operation are found in Annex C.
5 Verification
5.1 General conditions for tests
Tests according to this part of ISO 11148 are type tests.
5.2 Noise
The noise-emission values shall be measured and declared in accordance with ISO 15744.
Compliance with 4.4 may be verified through the comparison of the noise emission values with those for other
machines of the same family or with machines of similar size and performance characteristics.
5.3 Vibration
The vibration total value shall be measured and reported in accordance with ISO 28927-2.
The vibration-emission value and its uncertainty shall be declared in accordance with EN 12096.
Compliance with 4.5 may be verified through the comparison of the vibration emission values with those for
other machines of the same family or with machines of similar size and performance characteristics.
5.4 Unintentional start
Compliance with 4.8.2 shall be verified as follows.
Visually check that open-ended spanners require two separate and dissimilar actions to start them.
Open-ended spanners shall be subjected to a test in which the open-ended spanner shall be connected to the
energy supply and placed in any possible position and pulled over the horizontal plane by its hose and the tool
shall then not start.
5.5 Power tool construction
Compliance with 4.2.7 shall be verified by dropping a sample assembly power tool for threaded fasteners
without inserted tool or accessory three times onto a concrete surface from a height of 1 m without affecting its
operational and safety functions. The sample shall be positioned to vary the point of impact.
10 © ISO 2012 – All rights reserved

ISO 11148-6:2012(E)
5.6 Structure of verification of safety requirements
Table 1 — Structure of verification
Safety requirement Visual Functional Measurement Reference
check check [to the subclause(s) of this part
of ISO 11148 or other standard]
4.2.1 X — — —
Surfaces, edges and corners
4.2.2 X X — —
Supporting surface and stability
4.2.3 X — — —
Hydraulic fluid ejection
4.2.5 X — — —
Access openings
4.2.6 X — — —
Socket retainer
4.2.7 — X — 5.5
Power tool construction
4.3 — X X ISO 13732-1
Thermal safety ISO 13732-3
4.4 — — X ISO 15744
Noise reduction 5.2
4.5 — — X ISO 28927-2
Vibration 5.3
4.6.1 — X — —
Exhaust air or gas
4.7.1 X — — —
Design of the handle
4.7.2 X X — —
Suspension device
4.7.3 X X — —
Reaction torque absorption
4.8.1 — X — —
Start-and-stop device
4.8.2 X X — 5.4
Unintentional start
4.8.3 X X — —
Actuating forces
4.8.4 X X — —
Directional control device
6 Information for use
6.1 Marking, signs and written warnings
Assembly power tools for threaded fasteners shall be marked visibly, legibly and indelibly with the following
information:
— name and full address of the manufacturer and, where applicable, his/her authorized representative;
NOTE 1 The address can be simplified if there is not really enough room on small machines, as long as the manufacturer
(and, where applicable, his/her authorized representative) can always be identified so that mail is able to reach the company.
— designation of series or type;
ISO 11148-6:2012(E)
NOTE 2 The designation of the tool can be achieved by a combination of letters and numbers.
— serial number or batch number;
— year of construction, that is the year in which the manufacturing process is completed;
— rated speed, in revolutions per minute:
— for pneumatic assembly power tools for threaded fasteners:
— the rated air pressure marked as (max.);
— for hydraulic assembly power tools for threaded fasteners:
— the nominal pressure and flow,
— the maximum allowable setting for the pressure relief valve.
Assembly power tools for threaded fasteners shall be permanently marked with a graphical symbol in
accordance with Annex C showing that the operator’s instructions shall be read before work starts.
The direction of rotation, as required in 4.8.4, shall be permanently marked in accordance with Annex C.
Open-ended spanners shall have a warning sign in accordance with Annex C affixed to the head, warning
against the risk of crushing.
Tools with fixed torque reaction bars shall be provided with labels as shown in Annex C indicating the proper
position of the reaction device.
Other graphical symbols that can be used are shown in Annex C.
6.2 Instructions handbook
6.2.1 General
For the information provided to the user, the content of Clause 6 together with ISO 12100:2010, 6.4
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