- Thread Class
- 3A
- Thread Direction
- Right-hand
- Thread Length
- 0.444 inches minimum and 0.494 inches maximum
- Fastener Length
- 0.642 inches minimum and 0.672 inches maximum
- Head Style
- Oval countersunk
- Head Diameter
- 0.3898 inches minimum and 0.3948 inches maximum
- Grip Diameter
- 0.2485 inches minimum and 0.2495 inches maximum
- Internal Drive Style
- Offset cruciform (torque set)
- Nominal Thread Diameter
- 0.250 inches
- Grip Length
- 0.178 inches minimum and 0.198 inches maximum
- Thread Quantity per Inch
- 28
- Minimum Tensile Strength
- 180000 pounds per square inch
- Hardness Rating
- 39.0 rockwell C minimum overall and 43.0 rockwell C maximum overall
- Countersink Angle
- 99.0 degrees minimum and 101.0 degrees maximum
- Surface Finish
- 32.0 microinches grip
- Surface Finish
- 32.0 microinches threads
- Material
- Steel comp 8740 overall
- Material Document and Classification
- MIL-S-6049 mil spec single material response overall
- Surface Treatment
- Aluminum overall
- Surface Treatment Document and Classification
- MIL-C-83488, type 2 class 3 mil spec single treatment response overall
- Thread Series Designator
- UNJF
- Specification/Standard Data
- 76301-3-963 manufacturers standard
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.