- Nominal Thread Diameter
- 0.250 in
- Thread Series
- UNJF-28
- Thread Class
- 3A, Right-hand
- Thread Length
- 0.589–0.609 in
- Fastener Length
- 0.688 in
- Grip Length
- 0.079–0.099 in
- Head Style
- Double hexagon with hole
- Head Height
- 0.300 in
- Width Between Flats
- 0.312 in
- Extended Washer Diameter
- 0.438 in
- Extended Washer Thickness
- 0.060 in min
- Hole Diameter
- 0.070 in (4 round drilled holes)
- Material
- Iron alloy 660 (AMS 5731)
- Surface Treatment
- Silver (AMS 2411)
- Min Tensile Strength
- 130,000 PSI
- Min Yield Strength
- 85,000 PSI
- Hardness
- 248–341 Brinell
- Surface Finish
- 32.0 microinches
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.