- Thread Class
- 3A
- Thread Direction
- Right-hand
- Thread Length
- 0.533 inches minimum and 0.634 inches maximum
- Fastener Length
- 1.552 inches minimum and 1.572 inches maximum
- Head Style
- Double hexagon W/hole
- Head Height
- 0.320 inches minimum and 0.340 inches maximum
- Width Between Flats
- 0.305 inches minimum and 0.313 inches maximum
- Extended Washer Diameter
- 0.428 inches minimum and 0.448 inches maximum
- Extended Washer Thickness
- 0.060 inches minimum and 0.070 inches maximum
- Grip Diameter
- 0.2494 inches minimum and 0.2499 inches maximum
- Nominal Thread Diameter
- 0.250 inches
- Grip Length
- 0.868 inches minimum and 0.898 inches maximum
- Thread Quantity per Inch
- 28
- Minimum Tensile Strength
- 130000 pounds per square inch
- Hardness Rating
- 24.0 rockwell C minimum and 35.0 rockwell C maximum overall
- Minimum Yield Strength
- 85000 pounds per square inch
- Criticality Code Justification
- SUPP
- Surface Finish
- 32.0 microinches bearing surface of head
- Surface Finish
- 32.0 microinches grip
- Surface Finish
- 32.0 microinches threads
- Special Features
- Undercut 0.221 inch min, 0.231 inch max dia.; 0.050 inch min, 0.060 inch max length
- Material
- Iron alloy 660 overall
- Material Document and Classification
- Ams 5731 assn std single material response overall
- Supplementary Features
- Failure could result in loss or damage to vehicle or weapons system, or death or injury to personnel
- 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.