- Thread Class
- 3A
- Thread Direction
- Right-hand
- Thread Length
- 0.283 inches minimum and 0.334 inches maximum
- Fastener Length
- 1.231 inches minimum and 1.251 inches maximum
- Head Style
- Flat countersunk
- Head Diameter
- 0.449 inches minimum and 0.507 inches maximum
- Locking Feature
- Detent ball grip
- Grip Diameter
- 0.2483 inches minimum and 0.2492 inches maximum
- Shank Unthreaded Hole Diameter
- 0.076 inches minimum first hole and 0.086 inches maximum first hole
- Internal Drive Style
- High-torque
- Nominal Thread Diameter
- 0.250 inches
- Grip Length
- 0.812 inches minimum and 0.828 inches maximum
- Thread Quantity per Inch
- 28
- Hardness Rating
- 36.0 rockwell C minimum overall and 41.0 rockwell C maximum overall
- Countersink Angle
- 100.0 degrees nominal
- Distance from Head Largest Bearing Surface to Shank Hole Center
- 1.131 inches minimum first hole and 1.161 inches maximum first hole
- Surface Finish
- 63.0 microinches grip
- Surface Finish
- 63.0 microinches top of head
- Material
- Steel overall
- Material Document and Classification
- MIL-B-83050 mil spec single material response 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.