- Thread Class
- 3A
- Thread Direction
- Right-hand
- Thread Length
- 0.291 in min / 0.341 in max
- Fastener Length
- 0.926 in min / 0.956 in max
- Head Style
- Flat countersunk
- Head Diameter
- 0.496 in min / 0.510 in max
- Internal Drive Style
- Torque set
- Nominal Thread Diameter
- 0.250 inches
- Thread Quantity per Inch
- 28
- Min Tensile Strength
- 160,000 psi
- Hardness
- 36.0-40.0 Rockwell C
- Countersink Angle
- 99.0-101.0 degrees
- Material
- Steel (4140/E4340/6150/8735/8740)
- Material Specs
- MIL-S-5626, MIL-S-5000, MIL-S-8503, MIL-S-6098, MIL-S-6049
- Surface Treatment
- Cadmium & chromate (QQ-P-416 Type 2 Class 3)
- Thread Series
- UNF
- Specification
- NAS1624
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.