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BS 2A204,2A206,2A208,A217-A225(1963) : 1963 PD 6167

Current
Current

The latest, up-to-date edition.

SPECIFICATIONS FOR MACHINE SCREWS AND NUTS (UNIFIED THREADS) BELOW 1/4 INCH FOR AERONAUTICAL PURPOSES
Published date

23-11-2012

FOREWORD
SPECIFICATION
1. SCOPE
2. MATERIALS
3. FREEDOM FROM DEFECTS
4. DIMENSIONS
5. HEADS OF SCREWS
6. LENGTH OF SCREWS
7. ENDS OF SCREWS
8. SCREWS THREADS
9. LENGTH OF THREAD ON SCREWS
10. CHAMFERING
11. COUNTERSINKING
12. FINISH
13. IDENTIFICATION AND MARKING
Appendix A - ALTERNATIVE METHODS OF IDENTIFICATION
             OF SCREWS WITH UNIFIED THREADS
Appendix B - FLUSHNESS GAUGE FOR COUNTERSUNK HEAD
             SCREWS
Appendix C - FORMULAE FOR DIMENSIONS OF COUNTERSUNK
             HEAD SCREWS
Appendix D - MILLIMETERE EQUIVALENTS OF BASIC DIAMETERS
             OF SCREWS AND NUTS
Appendix E - TABLE FOR CONVERSATION OF INCHES TO APPROXIMATE
             MILLIMETERE EQUIVALENTS

Gives dimensions, material, protective treatment and part numbers for countersunk head and pan head machine screws and nuts with Unified threads for aeronautical use.

Committee
ACE/12
DevelopmentNote
Supersedes BS A204-209(1957) (07/2005) Reviewed and confirmed by BSI, January 2008. (12/2007)
DocumentType
Standard
PublisherName
British Standards Institution
Status
Current

15/30281806 DC : 0 BS A 401 TO A 420 - AEROSPACE SERIES - SPECIFICATION FOR SCREWS, PAN AND 100 DEGREES COUNTERSUNK HEAD, HEXALOBULAR DRIVE RECESS (UNIFIED THREADS BELOW 1/4 INCH), VARIOUS MATERIALS
BS A 401-420:2015 Specification for screws, pan and 100° countersunk head, hexalobular drive recess (unified threads below ¼ inch) in various materials

BS 3155(1960) : LATEST AMERICAN MACHINE SCREWS AND NUTS IN SIZES BELOW .25 INCH DIAMETER
BS 350-2(1962) : LATEST CONVERSION FACTORS AND TABLES - DETAILED CONVERSION TABLES

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