Military Standard Aircraft Machine Bolt
- Close Tolerance
- Undrilled Head
- Drilled Thread
- Fine Threads
- UNF-3A
- Material: Alloy Steel
- Major Diameter: 0.25 in.
- Threads Per Inch (TPI): 28
- Length: 0.781 in.
- Grip: 0.375 in.
- Industry Standard Specification: AIA/NAS NASM173-186