- Thread Class
- 3A
- Thread Direction
- Right-hand
- Thread Length
- 0.444 inches minimum and 0.494 inches maximum
- Fastener Length
- 1.569 inches minimum and 1.589 inches maximum
- Head Style
- Dished hexagon
- Head Height
- 0.156 inches minimum and 0.171 inches maximum
- Width Between Flats
- 0.492 inches minimum and 0.502 inches maximum
- Hole Diameter
- 0.3110 inches minimum and 0.3120 inches maximum
- Grip Diameter
- 0.311 inches nominal
- Nominal Thread Diameter
- 0.312 inches
- Grip Length
- 0.950 inches nominal
- Thread Quantity per Inch
- 24
- Minimum Tensile Strength
- 16000 pounds per square inch
- Hardness Rating
- 36.0 rockwell C minimum overall and 40.0 rockwell C maximum overall
- Surface Finish
- 32.0 microinches bearing surface of head
- Material
- Steel comp E4340 overall
- Surface Treatment
- Chromate overall and cadmium 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.