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ICS 49.030.20
BS 4A 114:1999 +A2:2015
Incorporating corrigenda Nos 1 and 2
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BS 4A 114:1999+A1:2012
ISBN 978 0 580 92822 2
Amendments/corrigenda issued since publication
C2 February 2016 Clause 2 and 4.2 b) updated Table 1
– max and min columns reordered Table 2 – upper tolerance of E updated
This British Standard,
having been approved by the
Engineering Sector Committee,
was published under authority
of the Standards Committee
and comes into effect
on 15 July 1999
© The British Standards
Institution 2016
Published by BSI Standards
Limited 2016
The following BSI references
relate to the work on this
standard:
Committee reference ACE/12
Drafts for comment
98/706175 DC,
12/30262058 DC,
15/30317035 DC
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BS 4A 114:1999+A1:2012
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© The British Standards Institution 2012
Protective finish
Materials for manufacture of bolts
2
BS 4A 114:1999+A2:2015
BS 4A 114:1999+A2:2015
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BS 4A 114:1999+A2:2015
Foreword
Publishing information
This British Standard is published by BSI Standards Limited, under licence from The British Standards Institution, and came into effect on 15 July 1999
It was prepared by Technical Committee ACE/12, Aerospace fasteners and
fastening systems A list of organizations represented on this committee can
be obtained on request to its secretary
Supersession
BS 4A 114:1999+A2:2015 supersedes BS 4A 114:1999+A1:2012, which is withdrawn
Information about this document
Text introduced or altered by Amendments No 1 (and No 2, respectively) are indicated in the text by tags (and ) Minor editorial changes are not tagged
Contractual and legal considerations
This publication does not purport to include all the necessary provisions of a contract Users are responsible for its correct application
Compliance with a British Standard cannot confer immunity from legal obligations.
BS 4A 114:1999+A2:2015
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BS EN ISO 6506-1, Metallic materials – Brinell
hardness test – Part 1: Test method.
BS EN ISO 6507-1, Metallic materials – Vickers
hardness test – Part 1: Test method.
© The British Standards Institution 2015
BS HR 650, Specification for High expansion
heat-resisting steel bar and wire for the manufacture of bolts, studs, set screws and nuts – (Ni 25.5, Cr 15, Ti 2, Mn 1.5, Mo 1.25,
Si 0.7, V 0.3) (Limiting ruling section 20 mm).
N X^D`}Xd`} )`A d[D{)`:D}
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countersink
NOTE The bearing lengths L quoted in Table 2 are in 0.10 inch
L, M and E need to be adjusted
There shall be no protective finish applied.
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The hardness values of finished bolts shall be as follows in accordance with the BS EN ISO 6506-1 and BS EN ISO 6507-1:
a) for machined components: 255 min./321 max
HB or 270 min./340 max HV;
b) for forged components: 248 min./341 max HB
or 260 min./360 max HV.
1
a) 0.2 % proof stress (min.) : 590 MPa;
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BS 4A 114:1999+A2:2015
c) elongation (min.) : 12 %;
d) Izod impact (min.) : 55J (40 ft lbf )
NOTE This is not applicable to the materials given in
BS EN 2398 and BS EN 2399.
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This British Standard specifies materials and manufacture, dimensions, protective treatment and quality assurance requirements for corrosion-resisting and heat resisting steel, mushroom-headed, slotted-drive, bolts
(minimum tensile strength 880 MPa).
The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application For dated references, only the edition cited applies
For undated references, the latest edition
of the referenced document (including any amendments) applies
BS 4A 100:2003, Specification for general
requirements for bolts and free running nuts of tensile strength not exceeding 1249 MPa.
BS S 80, Specification for high chromium-nickel
corrosion-resisting steel forging stock, bars, forgings and parts (880-1080 MPa, limiting ruling section 100 mm).
BS S 143, Specification for
chromium-nickel-copper-molybdenum corrosion-resisting steel (precipitation hardening) billets, bars, forgings and parts (930-1080 MPa).
Text deleted.
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BS EN 2398, Aerospace series – Heat resisting
steel FE-PA2601 (X6NiCrTiMoV26-15) – Rm =
900 MPa – Bars for machined bolts – D = 25 mm.
BS EN 2399, Aerospace series – Heat resisting
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BS 4A 114:1999+A2:2015
1
© The British Standards Institution 2016
b) tensile strength (min.) : 880 MPa
Text deleted;
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Bolts made from material conforming to BS EN 2398
or BS EN 2399 shall be identified with a code “X ”,
e.g a 6-32 UNC bolt with an “L” dimension of
0.1 inches and made from one of the two materials
above shall be referenced as “A114X1B” or for
bolts made from material conforming to BS S 80 or
BS S 143, this shall be identified as “A114-1B”
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Bolts shall be marked in accordance with
BS 4A 100:2003, Clause Bolts for all nominal
sizes made from material conforming to
BS EN 2398 or BS EN 2399 shall be marked with
an “X ”.
BS 4A 114:1999+A1:2012
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6-32 UNC 8-32 UNC 10-32 UNF 1/4-28 UNF 5/16-24 UNF
BS 4A 114:1999+A2:2015
3
© The British Standards Institution 2016
0.1375 0.1635 0.1895 0.2495 0.3120
0.1345 0.1605 0.1865 0.2465 0.3090
0.316 0.378 0.441 0.565 0.690
0.303 0.364 0.425 0.546 0.666
0.086 0.102 0.118 0.150 0.183
0.074 0.088 0.103 0.133 0.162
0.015 0.020 0.020 0.030 0.030
0.005 0.010 0.010 0.015 0.015
0.030 0.030 0.030 0.040 0.040
0.020 0.020 0.020 0.030 0.030
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BS 4A 114:1999+A1:2012
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© The British Standards Institution 2012
BS 4A 114:1999+A2:2015
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© The British Standards Institution 2015
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© The British Standards Institution 2016
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BS 4A 114:1999+A2:2015
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BS EN 2398 High expansion heat-resisting steel For the manufacture of machined bolts
BS EN 2399 High expansion heat-resisting steel For the manufacture of forged bolts
BS S 80 2 1/2% nickel-chromium-molybdenum steel For the manufacture of machined bolts
BS S 143 Chromium-nickel-molybdenum
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BS 4A 114:1999+A2:2015
7
© The British Standards Institution 2015
BS HR 650
High expansion heat-resisting steel bar and wire For the manufacture of bolts, studs, set screws and nuts
36E 37E 38E 39E 40E 41E 42E 43E 44E 45E 46E 47E 48E 49E 50E
36G 37G 38G 39G 40G 41G 42G 43G 44G 45G 46G 47G 48G 49G 50G 4.801
BS 4A 114:1999+A2:2015
7
© The British Standards Institution 2016
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standards-related publications, information and services.
BSI is incorporated by Royal Charter British Standards and other standardization products are published by BSI Standards Limited.
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