- Thread Class
- 3A
- Thread Direction
- Right-hand
- Thread Length
- 0.679 inches minimum
- Fastener Length
- 0.719-0.750 inches
- Head Style
- PAN
- Head Diameter
- 0.473-0.492 inches
- Head Height
- 0.162-0.175 inches
- Internal Drive Style
- Torque set
- Nominal Thread Diameter
- 0.250 inches (1/4-28 UNF)
- Thread Quantity per Inch
- 28
- Min Tensile Strength
- 160000 PSI
- Hardness Rating
- 36.0-40.0 Rockwell C
- Screw Material
- Steel comp 4140/E4340/6150/8735/8740
- Material Spec
- MIL-S-5626/MIL-S-5000/MIL-S-8503/MIL-S-6098/MIL-S-6049
- Surface Treatment
- Cadmium and chromate per QQ-P-416 Ty2 Cl3
- Thread Series Designator
- UNF
- Specification
- NAS1100
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.