kSIST FprEN 6128:2026
(Main)Aerospace series - Blind bolt, 100° flush head, high strength
- Abstract
This document specifies the configuration, dimensions, tolerances and mass of a stainless steel blind bolt with 100° flush head for aerospace applications.
- Status
- Not Published
- Public Enquiry End Date
- 15-Oct-2024
- Technical Committee
- I13 - Imaginarni 13
- Current Stage
- 5020 - Formal vote (FV) (Adopted Project)
- Start Date
- 06-Aug-2026
- Due Date
- 24-Sep-2026
- Completion Date
- 07-Aug-2026
kSIST FprEN 6128:2026 is SIST’s publication for an aerospace blind bolt with a 100° flush head and high strength. It specifies the bolt’s configuration, dimensions, tolerances and mass, and it also covers the material, finish, lubrication, designation, marking and the technical specification used for the part.
What does kSIST FprEN 6128:2026 specify?
kSIST FprEN 6128:2026 specifies the requirements for a stainless steel blind bolt with a 100° flush head for aerospace applications. The document is organized into clauses on scope, normative references, terms and definitions, requirements, designation, marking and technical specification.
The core technical content is built around Figure 1 and Figure 2 and Tables 1 to 6. In practice, that means the standard gives the geometry, the installed performance data, the allowable grip range, the mass, and the approved material and finish options needed to select and inspect the fastener.
What are the key requirements of kSIST FprEN 6128:2026?
The most important requirements are in Clause 4, and they link the part’s geometry, installation performance and material choices. For a user, this is the section that drives part selection, drawing checks, incoming inspection and installation planning.
Geometry, tolerances and installed performance
Clause 4.1 requires the configuration, dimensions, tolerances, static strength, tensile preload and spindle retention to conform to Figure 1, Figure 2 and Tables 1 and 2. In practice, this is the main acceptance basis for the fastener shape and the installed mechanical performance.
Figure 1 identifies the bolt configuration, serrated pin geometry, locking collar, sleeve and shifting anvil/drive washer arrangement. Figure 2 shows typical installation and notes the permitted blind-side slope, which matters when the joint is hard to access or has a non-flat blind side.
Grip range and mass
Clause 4.2 assigns the grip range and mass from Tables 3 and 4. That lets the buyer or engineer match the fastener to the joint thickness and control weight during design or procurement.
The designation uses a grip length code, so the table is not just reference data - it is what makes the correct part number possible. The table also includes special notes for some diameter codes, which matters when a single joint design uses different bolt sizes.
Material, finish and lubrication
Clause 4.3 requires material, finish and lubrication according to Tables 5 and 6. The tables list material combinations for the sleeve, serrated pin and locking collar, together with finish options and permitted lubricants.
For practice, this means the spec is not open-ended on surface treatment or lubrication. A supplier has to build the part from the listed material options and use one of the permitted lubricants when lubrication is applied.
Designation and marking
Clause 5 gives the part designation format, using the standard number, material code, diameter code, grip length code and sleeve finish code. Clause 6 requires marking in EN 2424 style B, with the standard number, grip length code and manufacturer identification on the fastener head.
This matters because the part number and head marking are the traceability tools used in purchasing, kitting and inspection. Clause 5 also shows how diameter code 05 is handled when a reduced diameter shifting anvil/drive washer is used.
Technical specification
Clause 7 states that the technical specification is NASM8975, except for the strength, preload and spindle retention values given in Table 2. That tells the reader which general fastener specification applies and where this document overrides it.
What terms does kSIST FprEN 6128:2026 define?
- Blind bolt - A fastener intended for joints that can be installed from one side.
- 100° flush head - A head form designed to sit in a 100° countersink with a flush outer surface.
- Grip length - The joint thickness range the fastener is intended to clamp, encoded in the designation.
- Preload - The tensile load present in the installed fastener after setting.
- Spindle retention - The ability of the spindle to remain retained after installation.
- CRES - The material code used in the tables for corrosion-resistant steel variants.
- Marking - The identification placed on the fastener head for traceability and part control.
Who uses kSIST FprEN 6128:2026?
kSIST FprEN 6128:2026 is used by aerospace designers, fastener manufacturers, procurement teams, quality inspectors and installation personnel. It helps them choose the correct bolt configuration, verify the installed performance, define the correct designation and check marking and material/finish compliance.
It is also relevant to suppliers of surface treatment and lubrication, because the document names the permitted finish and lubricant options and links them to the material table.
What changed in kSIST FprEN 6128:2026 from the previous edition?
kSIST FprEN 6128:2026 updates the earlier EN 6128:2017 edition. The listed technical changes are updated Figures 1 and 2 with dimensions Q and X removed, removal of dimension Q from Table 1, corrected single values and removed hole limits in Table 3, corrected values for diameter code 05 in Table 4, and updated Table 5 and Table 6 to match the current normative references and preferred options.
Which standards are used with kSIST FprEN 6128:2026?
| Standard | What it contributes |
|---|---|
| EN 2424 | Marking of aerospace products |
| EN 4473 | Aluminium pigmented coatings for fasteners |
| DOD-L-85645 | Dry film lubricant |
| MIL-PRF-46010 | Solid film, heat cured, corrosion inhibiting lubricant |
| NASM8975 | General technical specification for blind fasteners |
| SAE AMS2700 | Passivation of corrosion resistant steels |
| SAE AMS5687 | Wire material for Inconel |
| SAE AMS5690 | Wire material for 316 corrosion and heat resistant steel |
| SAE AMS5737 | Wire, bar and related stock for A286 material |
| SAE AS5272 | Solid film, heat cured, corrosion inhibiting lubricant |
| SAE AS87132 | Cetyl alcohol lubricant for fasteners |
What does the kSIST FprEN 6128:2026 document contain?
kSIST FprEN 6128:2026 contains Figure 1 for the bolt configuration and Figure 2 for typical installation. It also contains Tables 1 and 2 for dimensions, tolerances, strength, preload and spindle retention.
Tables 3 and 4 provide grip range and mass data for selection and ordering. Tables 5 and 6 give the material, finish and lubrication options, including the sleeve finish codes used in the designation. Clauses 5 to 7 then turn those technical definitions into the part designation, head marking and the governing technical specification.
Relations
- Effective Date
- 06-Sep-2023
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Frequently Asked Questions
kSIST FprEN 6128:2026 is a draft published by the Slovenian Institute for Standardization (SIST). Its full title is "Aerospace series - Blind bolt, 100° flush head, high strength". This standard covers: This document specifies the configuration, dimensions, tolerances and mass of a stainless steel blind bolt with 100° flush head for aerospace applications.
This document specifies the configuration, dimensions, tolerances and mass of a stainless steel blind bolt with 100° flush head for aerospace applications.
kSIST FprEN 6128:2026 is classified under the following ICS (International Classification for Standards) categories: 49.030.20 - Bolts, screws, studs. The ICS classification helps identify the subject area and facilitates finding related standards.
kSIST FprEN 6128:2026 has the following relationships with other standards: It is inter standard links to SIST EN 6128:2017. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
kSIST FprEN 6128:2026 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
SLOVENSKI STANDARD
oSIST prEN 6128:2024
01-oktober-2024
Aeronavtika - Slepa kovica, 100° ugrezna glava, visoka trdnost
Aerospace series - Blind bolt, 100° flush head, high strength
Luft- und Raumfahrt - Blindbolzen, 100° Senkkopf, hochfest
Série aérospatiale - Boulon aveugle, tête fraisée 100°, haute résistance
Ta slovenski standard je istoveten z: prEN 6128
ICS:
49.030.20 Sorniki, vijaki, stebelni vijaki Bolts, screws, studs
oSIST prEN 6128:2024 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
oSIST prEN 6128:2024
oSIST prEN 6128:2024
DRAFT
EUROPEAN STANDARD
prEN 6128
NORME EUROPÉENNE
EUROPÄISCHE NORM
July 2024
ICS 49.030.20 Will supersede EN 6128:2017
English Version
Aerospace series - Blind bolt, 100° flush head, high
strength
Série aérospatiale - Boulon aveugle, tête fraisée 100°, Luft- und Raumfahrt - Blindbolzen, 100° Senkkopf,
haute résistance hochfest
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee ASD-
STAN.
If this draft becomes a European Standard, 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.
This draft European Standard was established by CEN 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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.
Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2024 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 6128:2024 E
worldwide for CEN national Members.
oSIST prEN 6128:2024
prEN 6128:2024 (E)
Contents Page
European foreword . 3
1 Scope . 4
2 Normative references . 4
3 Terms and definitions . 4
4 Requirements . 5
4.1 Configuration, dimensions tolerances, static strength, preload and spindle retention . 5
4.2 Grip range and mass . 5
4.3 Material, finish, lubrication . 5
5 Designation . 16
6 Marking . 16
7 Technical specification . 16
oSIST prEN 6128:2024
prEN 6128:2024 (E)
European foreword
This document (prEN 6128:2024) has been prepared by ASD-STAN.
After enquiries and votes carried out in accordance with the rules of this Association, this document has
received the approval of the National Associations and the Official Services of the member countries of
ASD-STAN, prior to its presentation to CEN.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 6128:2017.
This document includes the following significant technical changes with respect to EN 6128:2017:
a) Figure 1 and Figure 2 updated (dimensions Q and X removed);
b) dimension Q removed in Table 1 accordingly;
c) Table 3: Single values corrected and hole limits removed;
d) Table 4: Values of diameter code 05 corrected;
e) Table 5 and Table 6 updated according updated normative references and preferred options.
oSIST prEN 6128:2024
prEN 6128:2024 (E)
1 Scope
This document specifies the configuration, dimensions, tolerances and mass of a stainless steel blind
bolt with 100° flush head for aerospace application.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements 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.
EN 2424, Aerospace series — Marking of aerospace products
EN 4473, Aerospace series — Aluminium pigmented coatings for fasteners — Technical specification
DOD-L-85645, Lubricant, Dry Film, Molecular Bonded
MIL-PRF-46010, Lubricant, Solid Film, Heat Cured, Corrosion Inhibiting NATO Code – S-1738
NASM8975, Fastener, Blind, High Strength, Installation Formed, Cres, Heat Resistant Steel and Titanium,
General Specification for
SAE AMS2700, Passivation of Corrosion Resistant Steels
SAE AMS5687, Nickel Alloy, Corrosion- and Heat-Resistant, Wire 74Ni-15.5Cr-8.0Fe Annealed
SAE AMS5690, Steel, Corrosion and Heat Resistant, Wire 17Cr-12Ni-2.5Mo (316) Solution Heat Treated
SAE AMS5737, Steel, Corrosion- and Heat-Resistant, Bars, Wire, Forgings, Mechanical Tubing, and Stock
for Forging and Heading 15Cr-25.5Ni-1.2Mo-2.1Ti-0.006B-0.30V (A286) Consumable Electrode Remelted
1650 °F (899 °C) Solution and Precipitation Heat Treated
SAE AS5272, Lubricant, Solid Film, Heat Cured, Corrosion Inhibiting, Procurement Specification
SAE AS87132, Lubricant, Cetyl Alcohol, 1-Hexadecanol, Application to Fasteners
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp/
— IEC Electropedia: available at https://www.electropedia.org/
Published by Department of Defense (DoD), available at: https://assist.dla.mil/.
Published by Aerospace Industries Association (AIA), available at: https://www.aia-aerospace.org/.
Published by Society of Automotive Engineers (SAE), available at: https://www.sae.org/.
oSIST prEN 6128:2024
prEN 6128:2024 (E)
4 Requirements
4.1 Configuration, dimensions tolerances, static strength, preload and spindle retention
The configuration, dimensions, tolerances, static strength, tensile preload and spindle retention shall
conform to Figure 1, Figure 2 and Table 1 and Table 2.
4.2 Grip range and mass
Grip range and mass shall be according to Table 3 and Table 4.
4.3 Material, finish, lubrication
Material, finish and lubrication shall be according to Table 5 and Table 6.
a) Bolt configuration
oSIST prEN 6128:2024
prEN 6128:2024 (E)
b) Serrated Pin geometry
Key
1 marking see Clause 6
2 serrated pin
3 locking collar
4 crown height (C)
5 grip
6 sleeve
7 shifting anvil
8 drive washer
a
Diameter of serrated pin head shall not exceed “⌀D” max.
b
steners are supplied with shifting anvil/drive washer of manufacturer’s option. The shifting anvil/drive
washer is not part of the installed fastener.
c
optional configuration
Figure 1 — Configuration — Dimensions
oSIST prEN 6128:2024
prEN 6128:2024 (E)
Key
1 grip
a
Blind side head may be installed on 7° max. slope; 5° max. slope for diameter codes 10 and 12.
Figure 2 — Typical installation
Table 1 — Dimensions and tolerances
Dimensions in mm (inch)
Diameter code
05 06 08 10 12
Theor.
8,48 9,83 12,90 16,13 19,38
⌀A
(0,334) (0,387) (0,508) (0,635) (0,763)
Ref.
1,88 2,08 2,74 3,56 4,27
B Ref.
(0,074) (0,082) (0,108) (0,140) (0,168)
0,28 0,33 0,43 0,51 0,58
C max.
(0,011) (0,013) (0,017) (0,020) (0,023)
±0,025 4,14 5,03 6,58 7,90 9,47
⌀D
(±0,001) (0,163) (0,198) (0,259) (0,311) (0,373)
±0,127 9,53 9,53 9,53 11,13 12,70
a
⌀J
(±0,005) (0,375) (0,375) (0,375) (0,438) (0,500)
±1,52 3,56 4,06 4,83 3,94 4,95
N
(±0,060) (0,140) (0,160) (0,190) (0,155) (0,195)
3,05 3,81 4,83 5,88 7,06
⌀D max.
(0,120) (0,150) (0,190) (0,231) (0,278)
2,16 2,79 3,66 4,62 5,69
⌀D max.
(0,085) (0,110) (0,144) (0,182) (0,224)
7,193 8,311 10,973 13,846 16,718
7,188 8,306 10,968 13,840 16,713
⌀W Gage dia.
(0,283 2) (0,327 2) (0,432 0) (0,545 1) (0,658 2)
(0,283 0) (0,327 0) (0,431 8) (0,544 9) (0,658 0)
oSIST prEN 6128:2024
prEN 6128:2024 (E)
Diameter code
05 06 08 10 12
0,523 0,617 0,787 0,932 1,087
0,434 0,521 0,686 0,826 0,965
Gage
H
height
(0,020 6) (0,024 3) (0,031 0) (0,036 7) (0,042 8)
(0,017 1) (0,020 5) (0,027 0) (0,032 5) (0,038 0)
7,62 8,13 9,40 8,89 10,29
b
P max.
(0,300) (0,320) (0,370) (0,350) (0,405)
5,66 6,86 9,01 9,47 11,38
⌀P min.
(0,223) (0,270) (0,355) (0,373) (0,448)
0,25 0,38 0,51 0,64 0,76
R max.
(0,010) (0,015) (0,020) (0,025) (0,030)
5,89 7,42 9,17 8,10 9,25
S max.
(0,232) (0,292) (0,361) (0,319) (0,364)
±0,76 20,32 21,08 24,77 31,60 41,35
J
(±0,030) (0,800) (0,830) (0,975) (1,244) (1,628)
Number
of
J2 18 19 20 18 18
serrations
min.
±0,76 1,52 1,78 2,29 1,98 1,85
X
(±0,030) (0,060) (0,070) (0,090) (0,078) (0,073)
0,13 0,13 0,13 0,36 0,36
E min.
(0,005) (0,005) (0,005) (0,014) (0,014)
0,33 0,33 0,33 0,51 0,58
C Ref.
(0,013) (0,013) (0,013) (0,022) (0,023)
±0,05 0,81 0,81 0,81 1,42 1,70
C
(±0,002) (0,032) (0,032) (0,032) (0,056) (0,067)
F ±5° 45° 45° 45° 45° 45°
G ±5° 30° 30° 30° 30° 30°
a
Diameter code 05 is also available with reduced diameter shifting anvil/drive washer [7,93 mm ±
...