- Thread Class
- 3A
- Thread Direction
- Right-hand
- Thread Length
- 0.768 inches minimum
- Fastener Length
- 3.663 inches nominal
- Head Style
- Double hexagon W/hole
- Head Height
- 0.504 inches nominal
- Width Between Flats
- 0.553 inches minimum and 0.564 inches maximum
- Extended Washer Diameter
- 0.818 inches minimum and 0.828 inches maximum
- Extended Washer Thickness
- 0.123 inches nominal
- Grip Diameter
- 0.4955 inches minimum and 0.4985 inches maximum
- Nominal Thread Diameter
- 0.500 inches
- Grip Length
- 2.865 inches minimum and 2.885 inches maximum
- Thread Quantity per Inch
- 20
- Minimum Tensile Strength
- 180000 pounds per square inch
- Hardness Rating
- 39.0 rockwell C minimum and 43.0 rockwell C maximum overall
- Material
- Steel overall
- Surface Treatment
- Cadmium and chromate overall
- Surface Treatment Document and Classification
- QQ-P-416, type 2, cl 2 fed spec all treatment responses 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.