- Thread Class
- 3A
- Thread Direction
- Right-hand
- Thread Length
- 0.865 inches minimum and 0.945 inches maximum
- Fastener Length
- 1.990 inches minimum and 2.010 inches maximum
- Head Style
- Double hexagon W/hole
- Head Height
- 0.338 inches minimum and 0.358 inches maximum
- Width Between Flats
- 0.375 inches nominal
- Extended Washer Diameter
- 0.490 inches minimum and 0.510 inches maximum
- Extended Washer Thickness
- 0.070 inches minimum
- Hole Diameter
- 0.060 inches minimum and 0.080 inches maximum
- Nominal Thread Diameter
- 0.312 inches
- Grip Length
- 1.065 inches minimum and 1.125 inches maximum
- Hole Quantity
- 4
- Hole Type
- Drilled
- Features Provided
- Finished head
- Thread Quantity per Inch
- 24
- Minimum Tensile Strength
- 130000 pounds per square inch
- Hardness Rating
- 24.0 rockwell C minimum overall and 35.0 rockwell C maximum overall
- Minimum Yield Strength
- 85000 pounds per square inch
- Hole Configuration Style
- Double hexagon longitudinal hole
- 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
- Ams 5731 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.