Specification for screws, pan and 100° countersunk head, hexalobular drive recess (unified threads below ¼ inch) in various materials

Specification for screws, pan and 100° countersunk head, hexalobular drive recess (unified threads below ¼ inch) in various materials

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What is BS A 401-420 - Aerospace series about?  

BS A 401-420 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. 

Who is BS A 401-420 - Aerospace series for? 

BS A 401-420 on Aerospace series is useful for: 

  • Manufacturers of screws and Panheads 
  • Aircraft manufacturers  
  • Spacecraft and space products manufacturers  
  • Aeronautical engineers  
  • Quality control personnel of screws and countersunk head 

Why should you use BS A 401-420 - Aerospace series?  

Manufacturing firms that are involved with aircraft flight within and outside the atmosphere. 

BS A 401-420 covers all the quality control requirements for screws, pan, and countersunk head. It creates a standardized approach for manufacturers of screws that they need to adhere to if they supply their products for use by the aerospace industry.  

Quality Assurance measurements in BS A 401-420 ensure that the approaches, techniques, methods, and processes designed for the aircraft assembly are implemented correctly. 

By adopting BS A 401-420, manufacturers can demonstrate the reliability of their assembly parts and build trust in their use throughout the aerospace supply chain.