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
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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