BS A 401-420:2015
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
Hardcopy , PDF
English
31-10-2015
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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.
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| 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) |
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| 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) |
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| 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 |
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| 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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