- Thread Class
- 3A
- Thread Direction
- Right-hand
- Thread Length
- 0.502 inches minimum and 0.522 inches maximum
- Fastener Length
- 1.387 inches nominal
- Head Style
- Double hexagon W/hole
- Head Height
- 0.300 inches nominal
- Width Between Flats
- 0.304 inches minimum and 0.313 inches maximum
- Extended Washer Diameter
- 0.428 inches minimum and 0.438 inches maximum
- Extended Washer Thickness
- 0.069 inches nominal
- Hole Diameter
- 0.037 inches nominal
- Grip Diameter
- 0.2485 inches minimum and 0.2495 inches maximum
- Nominal Thread Diameter
- 0.250 inches
- Grip Length
- 0.865 inches minimum and 0.885 inches maximum
- Hole Quantity
- 4
- Hole Type
- Drilled
- 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
- Hole Configuration Style
- Hexagon longitudinal hole
- Material
- Steel comp E4340 overall or steel comp 4340 overall or steel comp 8740 overall or steel comp 6150 overall or steel comp 4140 overall
- Surface Treatment
- Cadmium overall and chromate overall
- Surface Treatment Document and Classification
- QQ-P-416 type 2 class 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.