What is BS SP 55 AND SP 56 – Washers, spring, double coil about?  
BS SP 55 AND SP 56 provides specifications and requirements for washers, springs, double coil, steel cadmium plated, and phosphor bronze which has a major application in aircraft.
BS SP 55 AND SP 56 specify the materials, dimensions, and finish of double coil spring washers for aircraft, suitable for use with bolts and nuts B.A., B.S.F., or UNF. threads.
Who is BS SP 55 AND SP 56 - Washers, spring, double coil for?  
BS SP 55 AND SP 56 on Washers, spring, double coil is useful for: 
- Manufacturers and suppliers of washers and springs
- Product design engineers
- Quality control personnel
- Aviation, Aerospace and Defence Industries 
Why should you use BS SP 55 AND SP 56- Washers, spring, double coil?  
BS SP 55 AND SP 56 provides clear specifications, requirements, and dimensions for washers, springs, double coils that are mainly used in airplanes and aircraft. 
BS SP 55 AND SP 56 helps you to understand and follow best practices for manufacturing washers and springs, which contributes towards the maintenance of your quality management system.
Using BS SP 55 AND SP 56 guidelines, you contribute towards safer equipment and expeditions as well as longevity for the carrier.  
