This procurement specification covers 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 (AMS5061)
2. b UNS K91505 - high expansion steel (AMS5624)
3. c UNS K91456 - high expansion steel (AMS5625)
4. d UNS S32100 - corrosion and heat resistant steel (AMS5645)
5. e UNS S34700 - corrosion and heat resistant steel (AMS5646)