- Thread Class
- 3A
- Thread Direction
- Right-hand
- Thread Length
- 0.381 inches nominal
- Fastener Length
- 0.558-0.589 inches
- Head Style
- Flat countersunk
- Head Diameter
- 0.491-0.507 inches
- Locking Feature
- Strip (polychlorotrifluoroethylene)
- Internal Drive Style
- Torque set
- Nominal Thread Diameter
- 0.250 inches (1/4-28 UNF)
- Thread Qty/Inch
- 28
- Min Tensile Strength
- 180,000 psi
- Countersink Angle
- 99-101 degrees
- Material
- Iron alloy 660 (A-286)
- Surface Treatment
- Passivate per QQ-P-35
- Thread Surface Finish
- 32.0 microinches
- Thread Series
- 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.