This procurement specification covers aircraft quality bolts and screws made from carbon steels, high expansion steels, or corrosion and heat resistant steels of the type identified under the Unified Numbering System as follows:

1. a UNS K00802 - carbon steel (AMS 5061)
2. b UNS K91505 - high expansion steel (AMS 5624)
3. c UNS K91456 - high expansion steel (AMS 5625)
4. d UNS S32100 - corrosion and heat resistant steel (AMS 5645)