- Thread Class
- 3A
- Thread Direction
- Right-hand
- Thread Length
- 0.329 inches minimum and 0.369 inches maximum
- Fastener Length
- 0.428 inches minimum and 0.448 inches maximum
- Head Style
- Double hexagon W/hole
- Head Height
- 0.290 inches minimum and 0.310 inches maximum
- Width Between Flats
- 0.313 inches nominal
- Extended Washer Diameter
- 0.428 inches minimum and 0.438 inches maximum
- Extended Washer Thickness
- 0.060 inches nominal
- Nominal Thread Diameter
- 0.250 inches
- Grip Length
- 0.079 inches minimum and 0.099 inches maximum
- Features Provided
- Finished head
- Thread Quantity per Inch
- 28
- Minimum Tensile Strength
- 85000 pounds per square inch
- Hardness Rating
- 24.0 rockwell C minimum overall and 35.0 rockwell C maximum overall
- Minimum Yield Strength
- 130000 pounds per square inch
- Surface Finish
- 32.0 microinches bearing surface of head
- Surface Finish
- 32.0 microinches grip
- Surface Finish
- 32.0 microinches threads
- Material
- Iron alloy 660 overall
- Material Document and Classification
- AMS5731 assn std single material response overall
- Thread Series Designator
- UNJF
Catalogue data is compiled from public DLA/FLIS sources and is provided for
identification. Availability, condition and certification are confirmed on
quotation. OmniSynk Distribution Services is a stocking distributor.