- Thread Class
- 3A
- Thread Direction
- Right-hand
- Thread Length
- 0.521 inches minimum and 0.531 inches maximum
- Fastener Length
- 1.797 inches minimum and 1.827 inches maximum
- Head Style
- Bevel-conical
- Head Diameter
- 0.521 inches minimum and 0.531 inches maximum
- Head Height
- 0.312 inches nominal
- Internal Drive Style
- Hexagon
- Nominal Thread Diameter
- 0.312 inches
- Width Across Flats
- 0.219 inches minimum and 0.221 inches maximum
- Thread Quantity per Inch
- 24
- Minimum Tensile Strength
- 160000 pounds per square inch
- Hardness Rating
- 34.0 rockwell C minimum and 40.0 rockwell C maximum overall
- Material
- Steel comp 4340 or steel comp 4140 or steel comp 8740 or steel comp 8735 overall
- Surface Treatment
- Cadmium and chromate overall
- Surface Treatment Document and Classification
- QQ-P-416, cl 2, ty 2 fed spec single treatment 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.