Specification for gauging practice for 100° countersunk head fasteners for flushness control

Available format(s)

Hardcopy , PDF

Language(s)

English

Published date

31-01-1978

Publisher

British Standards Institution

FOREWORD
1 SCOPE
2 GENERAL REQUIREMENTS
3 PRINCIPLES OF FLUSHNESS CONTROL AND
RECOMMENDED GAUGING PRACTICE

Specifies the principles of flushness control and the recommended gauging practice for 100 degree countersunk head fasteners.

Committee	ACE/12
DevelopmentNote	Partially supersedes BS A211(1961) Supersedes 76/75414 DC (10/2005) Reviewed and confirmed by BSI, April 2008. (03/2008)
DocumentType	Standard
Pages	8
PublisherName	British Standards Institution
Status	Current
Supersedes	BS A 211:1961

BS A273 describes the principles of flushness control and the recommended gauging practice for 100° countersunk head fasteners.

15/30329889 DC : 0	BS A 266 TO 271 - BOLT, 100 DEGREES COUNTERSUNK HEAD, HI-TORQUE SPEED DRIVE RECESS, UNJF THREAD, SPLIT PIN HOLE OPTION, TITANIUM ALLOY, VARIOUS FINISHES, CLASSIFICATION: 80 TF/IN[2] (1100 MPA) AT TA/+315 DEGREES C
BS 2A 266 to 2A 271:2016+A1:2019	Aerospace Series. Bolt, 100° Countersunk head, Hi-Torque speed drive recess, close tolerance shank, UNJF thread, split pin hole option, titanium alloy, various finishes. Classification: R<sub>m</sub> 1100–1250 MPa (160 000–180 000 lbf/in<sup>2</sup>) at Ambient Temperature \| +315 °C
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

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BS A 273:1978