- Thread Class
- 3A
- Thread Direction
- Right-hand
- Thread Length
- 0.291 inches minimum and 0.341 inches maximum
- Fastener Length
- 1.426 inches minimum and 1.456 inches maximum
- Head Style
- Flat countersunk
- Head Diameter
- 0.496 inches minimum and 0.510 inches maximum
- Internal Drive Style
- High-torque
- Nominal Thread Diameter
- 0.250 inches
- Thread Quantity per Inch
- 28
- Minimum Tensile Strength
- 160000 pounds per square inch
- Hardness Rating
- 36.0 rockwell C minimum and 40.0 rockwell C maximum
- Countersink Angle
- 99.0 degrees minimum and 101.0 degrees maximum
- Screw Material
- Steel comp 4140 or steel comp E4340 or steel comp 6150 or steel comp 8735 or steel comp 8740
- Screw Material Document and Classification
- MIL-S-5626 mil spec 1ST material response or MIL-S-5000 mil spec 2ND material response or MIL-S-8503 mil spec 3RD material response or MIL-S-6098 mil spec 4TH material response or MIL-S-6049 mil spec 5TH material response
- Screw Surface Treatment
- Cadmium and chromate
- Screw Surface Treatment Document and Classification
- QQ-P-416, type 2, class 3 fed spec all treatment responses
- Thread Series Designator
- UNF
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.