Aeronautical Standard Airframe Bolt, Drilled
- Hexagon Head
- Cotter Pin Hole
- UNF-3A
- Tensile: 125,000 lbs PSI
- Material: Steel
- Finish: Cadmium overall and chromate overall
- Major Diameter: 0.25 in.
- Thread Per Inch (TPI): 28
- Industry Standard Specification: AIA/NAS NASM3-20