- Thread Class
- 3A
- Thread Direction
- Right-hand
- Thread Length
- 0.492 inches minimum and 0.532 inches maximum
- Fastener Length
- 4.127 inches minimum and 4.147 inches maximum
- Head Style
- Double hexagon W/hole
- Head Height
- 0.290 inches minimum and 0.310 inches maximum
- Width Between Flats
- 0.3125 inches nominal
- Extended Washer Diameter
- 0.428 inches minimum and 0.438 inches maximum
- Extended Washer Thickness
- 0.059 inches minimum and 0.079 inches maximum
- Hole Diameter
- 0.032 inches minimum and 0.042 inches maximum
- Grip Diameter
- 0.2485 inches minimum and 0.2495 inches maximum
- Nominal Thread Diameter
- 0.250 inches
- Grip Length
- 3.615 inches minimum and 3.635 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
- Double hexagon longitudinal hole
- Material
- Steel comp 4140 overall or steel comp E4340 overall or steel comp 8740 overall or steel comp 6150 overall
- Surface Treatment
- Cadmium overall and chromate overall
- Surface Treatment Document and Classification
- QQ-P-416, ty 2 cl 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.