- Thread Class
- 3A
- Thread Direction
- Right-hand
- Thread Length
- 0.429 inches minimum and 0.578 inches maximum
- Fastener Length
- 2.891 inches minimum and 2.938 inches maximum
- Head Style
- Flat countersunk
- Head Diameter
- 0.447 inches minimum and 0.507 inches maximum
- Internal Drive Style
- Cross recess type 1
- Nominal Thread Diameter
- 0.250 inches
- Thread Quantity per Inch
- 28
- Minimum Tensile Strength
- 125000 pounds per square inch
- Hardness Rating
- 26.0 rockwell C minimum and 32.0 rockwell C maximum
- Countersink Angle
- 99.0 degrees minimum and 101.0 degrees maximum
- Screw Material
- Steel comp 8740 or steel comp 8630
- Screw Material Document and Classification
- MIL-S-6049 mil spec 1ST material response or MIL-S-6050 mil spec 2ND material response
- Screw Surface Treatment
- Cadmium and chromate
- Screw Surface Treatment Document and Classification
- QQ-P-416 ty 2 cl 3 fed spec single treatment response
- 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.