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Homepage>BS Standards>49 AIRCRAFT AND SPACE VEHICLE ENGINEERING>49.030 Fasteners for aerospace construction>49.030.20 Bolts, screws, studs>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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immediate downloadReleased: 2015-10-31
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 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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Standard number:BS A 401-420:2015
Pages:36
Released:2015-10-31
ISBN:978 0 580 82769 3
Status:Standard
DESCRIPTION

BS A 401-420:2015


This standard BS A 401-420:2015 Specification for screws, pan and 100° countersunk head, hexalobular drive recess (unified threads below ¼ inch) in various materials is classified in these ICS categories:
  • 49.030.20 Bolts, screws, studs

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.