FprEN 6128
(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
- Publication Date
- 03-Jan-2027
- Technical Committee
- ASD-STAN - Aerospace
- Drafting Committee
- ASD-STAN/D 3/S 2 - Fasteners
- Current Stage
- 5060 - Closure of Vote - Formal Approval
- Start Date
- 24-Sep-2026
- Completion Date
- 24-Sep-2026
FprEN 6128 is a CEN draft European Standard for an aerospace blind bolt with a 100° flush head and high strength. It specifies the configuration, dimensions, tolerances and mass of a stainless steel blind bolt for aerospace applications, so engineers, buyers and quality teams can define, select and inspect the same fastener type.
What does FprEN 6128 specify?
FprEN 6128 sets the product definition for a stainless steel blind bolt used in aerospace applications. It focuses on the bolt’s form, size, fit, mass and accepted material and finish combinations, so the fastener can be specified consistently across design, procurement and inspection.
The document is organized into:
- Scope
- Normative references
- Terms and definitions
- Requirements
- Designation
- Marking
- Technical specification
Clause 4 is the core of the document, with tables and figures covering geometry, performance and material options.
What are the key requirements of FprEN 6128?
FprEN 6128 is built around dimensional control, installation performance and identification. The most important requirements are in Clause 4, with supporting details in Figures 1 and 2 and Tables 1 to 6.
Configuration, dimensions and tolerances
Clause 4.1 requires the configuration, dimensions, tolerances, static strength, tensile preload and spindle retention to conform to Figure 1, Figure 2, Table 1 and Table 2. In practice, this means the bolt is not just a general fastener type - its head form, serrated pin geometry, sleeve arrangement and limiting dimensions are all controlled.
Figure 1 shows the main configuration and identifies the marking location, serrated pin, locking collar, crown height, grip, sleeve, shifting anvil and drive washer. Figure 2 shows typical installation, including the blind-side head slope limits. For a purchaser or inspector, these figures define what the installed fastener should look like and how it sits in an assembly.
Strength, preload and spindle retention
Table 2 gives the minimum installed single shear strength, tensile strength, tensile preload and spindle retention values. These are the performance checks that matter when the bolt is expected to hold load after installation. For design and qualification work, this table is the reference for the fastener’s installed mechanical behavior.
Grip range and mass
Clause 4.2 links grip range and mass to Table 3 and Table 4. Table 3 sets the usable grip length ranges, including different underlap and overlap cases and special notes for certain diameter codes. Table 4 gives mass per 1 000 pieces, which helps with procurement, logistics and weight-sensitive aerospace assemblies.
Material, finish and lubrication
Clause 4.3 refers to Tables 5 and 6 for the permitted material, finish and lubrication combinations. Table 5 links the sleeve, serrated pin and locking collar to specified materials and finish options, and it also allows lubrication by named product specifications when lubrication is used. Table 6 gives sleeve finish codes. This matters because surface treatment and lubrication affect corrosion resistance, installation behavior and part identification.
Designation
Clause 5 defines the designation format. The example shows how the standard number, material code, diameter code, grip length code and sleeve finish code are combined into one part number. This helps manufacturers and buyers order the correct variant without ambiguity. Clause 5 also notes a special change for diameter code 05 when the reduced diameter shifting anvil/drive washer is used.
Marking
Clause 6 requires marking according to EN 2424 style B on the fastener head, with the EN standard number, grip length code and manufacturer’s identification. It also allows the manufacturer’s material code or part number instead of the EN standard number, and it permits single-digit marking for grip length codes below 10. That gives production and inspection teams a clear marking format to check on the part.
Technical specification
Clause 7 points to NASM8975 as the technical specification, except for the strength, preload and spindle retention requirements stated in Table 2. In practice, this means FprEN 6128 uses an external fastener specification as its base, then overrides the performance values that are specific to this bolt.
Who uses FprEN 6128?
FprEN 6128 is used by aerospace designers, fastener manufacturers, procurement teams and quality inspectors. Designers use it to define the bolt type, grip range and performance level. Buyers and suppliers use it to order and produce the correct designation, material and finish. Quality teams use it to verify dimensions, marking, installation behavior and the installed strength-related requirements.
What changed in FprEN 6128 from the previous edition?
FprEN 6128 will supersede EN 6128:2017. The stated technical changes are:
- Figure 1 and Figure 2 were updated, with dimensions Q and X removed
- Dimension Q was removed from Table 1
- Table 3 was corrected and hole limits were removed
- Table 4 values for diameter code 05 were corrected
- Tables 5 and 6 were updated to match the current normative references and preferred options
Which standards are used with FprEN 6128?
FprEN 6128 uses several external documents to define marking, coatings, materials, lubrication and passivation:
- EN 2424 - marking of aerospace products
- EN 4473 - aluminium pigmented coatings for fasteners
- DOD-L-85645 - one permitted dry film lubricant
- MIL-PRF-46010 - one permitted solid film lubricant
- NASM8975 - the base technical specification used in Clause 7
- SAE AMS2700 - passivation of corrosion resistant steels
- SAE AMS5687, SAE AMS5690 and SAE AMS5737 - material specifications used in Table 5
- SAE AS5272 and SAE AS87132 - permitted lubrication options
What does the FprEN 6128 document contain?
The document contains the engineering definition of the blind bolt through figures, tables and short clauses. Figures 1 and 2 show the configuration and a typical installation. Tables 1 to 4 cover dimensions, tolerances, performance, grip range and mass, while Tables 5 and 6 define the material, finish, lubrication and sleeve finish coding.
It also contains the part designation scheme, the marking rule and the reference technical specification used for the fastener. For anyone building, buying or checking the part, these are the sections that turn the fastener type into a specific, orderable and inspectable product.
Relations
- Effective Date
- 06-Sep-2023
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Frequently Asked Questions
FprEN 6128 is a draft published by the European Committee for Standardization (CEN). 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.
FprEN 6128 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.
FprEN 6128 has the following relationships with other standards: It is inter standard links to EN 6128:2017. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
FprEN 6128 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 ±
...