- Thread Class
- 3A
- Thread Direction
- Right-hand
- Thread Length
- 0.345-0.395 inches
- Fastener Length
- 0.917-0.947 inches
- Head Style
- Dished hexagon
- Head Height
- 0.125-0.140 inches
- Width Between Flats
- 0.429-0.439 inches
- Grip Diameter
- 0.2485-0.2495 inches
- Nominal Thread Diameter
- 0.250 inches
- Grip Length
- 0.552-0.572 inches
- Thread Quantity per Inch
- 28
- Minimum Tensile Strength
- 160000 psi
- Surface Finish
- 32.0 microinches (bearing surface, grip, threads)
- Material
- Iron alloy 660
- Material Spec
- AMS 5731 or AMS 5737
- Surface Treatment
- Cadmium and chromate per QQ-P-416 TY2 CL2
- Thread Series Designator
- UNJF
- Specification
- NAS6304
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.