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BS A 401-420:2015

Current

Current

The latest, up-to-date edition.

Specification for screws, pan and 100° countersunk head, hexalobular drive recess (unified threads below ¼ inch) in various materials

Available format(s)

Hardcopy , PDF

Language(s)

English

Published date

31-10-2015

€271.12
Excluding VAT

1 Scope
2 Normative references
3 General
4 Quality assurance procedure
5 Material and manufacture
6 Protective finish
7 Freedom from defects
8 Dimensions
9 Head of screws
10 Hexalobular drive recess
11 Unified thread identifier
12 Length of screws
13 Screw threads
14 Ends of screws
15 Length of thread
16 Designation
17 Identification and marking
Annexes
Annex A (informative) - Screw equivalency quick reference
        guide
Annex B (informative) - Conversion tables
Annex C (informative) - Measuring inspection criteria for
        countersunk heads
Annex D (informative) - Derivation of design of the
        countersunk head
Bibliography

Defines the dimensions, materials, protective finishes and part numbers for 100 degrees countersunk head and pan head screws with unified threads for non-structural general aerospace use.

Committee
ACE/12
DevelopmentNote
Supersedes 15/30281806 DC. (11/2015)
DocumentType
Standard
Pages
36
PublisherName
British Standards Institution
Status
Current
Supersedes

This British Standard specifies the dimensions, materials, protective finishes and part numbers for 100° countersunk head and pan head screws with unified threads for non-structural general aerospace use.

BS 7S 80:2002 High chromium-nickel corrosion resisting steel forging stock, bars, forgings and parts (880 to 1080 MPa: limiting ruling section 100 mm)
BS A 273:1978 Specification for gauging practice for 100° countersunk head fasteners for flushness control
TR 4070 : 1 AEROSPACE SERIES - MOLYBDENUM DISULPHIDE COATINGS - LIST OF COMMERCIAL PRODUCTS
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NAS1800:2004 RECESS, SIX LOBE DRIVE, INTERNAL, DIMENSIONS FOR RECESS AND GAGES
SAE AMS 2417 : 2013 PLATING, ZINC-NICKEL ALLOY
BS S 154:1976 Specification. 2½% nickel-chromium-molybdenum steel billets, bars, forgings and parts (880-1080 MPa: limiting ruling section 150 mm)
BS EN ISO 898-1:2013 Mechanical properties of fasteners made of carbon steel and alloy steel Bolts, screws and studs with specified property classes. Coarse thread and fine pitch thread
SAE AMS 03-25 : 2015 SULFURIC ACID ANODIZING OF ALUMINUM AND ALUMINUM ALLOYS
BS 2S 130:1976 Specification for 18/9 chromium-nickel corrosion-resisting steel (niobium stabilized) billets, bars, forgings and parts (540 MPa: limiting ruling section 150 mm)
BS S148(1969) : 1969 SPECIFICATION FOR LOW NICKEL-CHROMIUM STEEL (BAR FOR THE MANUFACTURE OF FORGED BOLTS ONLY)
BS 2S 142:1977 Specification for 1% chromium-molybdenum steel billets, bars, forgings and parts (900-1100 MPa: limiting ruling section 40 mm)
BS EN 4826:2014 Aerospace series. Zinc-Nickel (12 %-16 % Ni) plating of steels with specified tensile strength ≤ 1 450 MPa, copper alloys, nickel alloys and aluminium alloys for parts and fasteners
BS 2S 129:1976 Specification for 18/9 chromium-nickel corrosion-resisting steel (titanium stabilized) billets, bars, forgings and parts (540 MPa: limiting ruling section 150 mm)
BS L 102:1971 Specification for bars and extruded sections of aluminium-copper-magnesium-silicon-manganese alloy (solution treated and aged at room temperature) (not exceeding 200 mm diameter or minor sectional dimension) (Cu 4.4, Mg 0.5, Si 0.7, Mn 0.8)
TR 3775 : 4 AEROSPACE SERIES - BOLTS AND PINS - MATERIALS
BS 2A204,2A206,2A208,A217-A225(1963) : 1963 PD 6167 SPECIFICATIONS FOR MACHINE SCREWS AND NUTS (UNIFIED THREADS) BELOW 1/4 INCH FOR AERONAUTICAL PURPOSES
BS EN 2399:2008 Aerospace series. Heat resisting steel FE-PA2601 (X4NiCrTiMoV26-15). Rm ≥ 900 MPa. Bars for forged bolts. D ≤ 25 mm
BS EN 2133:2010 Aerospace series. Cadmium plating of steels with specified tensile strength ≤ 1450 MPa, copper, copper alloys and nickel alloys
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BS EN 2516:1997 Passivation of corrosion resisting steels and decontamination of nickel base alloys
BS EN 2100:1992 Aluminium alloy AL-P2014A-T4511. Extruded bars and sections a or D ≤ 200 mm
BS EN 2398:2008 Aerospace series. Heat resisting steel FE-PA2601(X6NiCrTiMoV26-15). Rm ≥ 900 MPa. Bars for machined bolts. D ≤ 25 mm
BS EN 12166:2011 Copper and copper alloys. Wire for general purposes
BS EN 755-2:2016 Aluminium and aluminium alloys. Extruded rod/bar, tube and profiles Mechanical properties
BS 4A 100:2003 Specification for general requirements for bolts and free running nuts of tensile strength not exceeding 1249 MPa
BS L 168:1978 Specification for bars and extruded sections of aluminium-copper-magnesium-silicon-manganese alloy (solution treated and artificially aged) (not exceeding 200 mm diameter or minor sectional dimension) (Cu 4.4, Mg 0.5, Si 0.7, Mn 0.8)
BS EN ISO 10664:2014 Hexalobular internal driving feature for bolts and screws
BS S 158:1977 Specification for 1% chromium-molybdenum steel bars for the manufacture of forged bolts and forged nuts
BS 6338:1982 Specification for chromate conversion coatings on electroplated zinc and cadmium coatings
BS EN 2284:1991 Specification for sulfuric acid anodizing of aluminium and wrought aluminium alloys
BS 2S 147:1976 Specification for 0.5% nickel-chromium-molybdenum steel bars for the manufacture of forged bolts and forged nuts
BS EN 12163:2011 Copper and copper alloys. Rod for general purposes
BS EN 12164:2011 Copper and copper alloys. Rod for free machining purposes
NAS9800:2014 HEAD PROTRUSION GAGING, 100 DEGREES FLUSH HEAD FASTENERS, GAGE BLOCK, GAGE DIAMETERS AND STYLUS

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