- Thread Class
- 3A
- Thread Direction
- Right-hand
- Thread Length
- 1.000 inches minimum
- Fastener Length
- 2.250 inches nominal
- Head Style
- Flat chamfer
- Head Diameter
- 0.365-0.375 inches
- Head Height
- 0.244-0.250 inches
- Hole Diameter
- 0.050 inches nominal
- Internal Drive Style
- Hexagon
- Nominal Thread Diameter
- 0.250 inches (1/4-28 UNF)
- Width Across Flats
- 0.188-0.190 inches
- Hole Quantity
- 6
- Hole Type
- Drilled
- Thread Quantity per Inch
- 28
- Minimum Tensile Strength
- 170000 psi
- Hardness Rating
- 36.0-43.0 Rockwell C
- Minimum Yield Strength
- 150000 psi
- Hole Configuration Style
- Round internal hexagon
- Material
- Steel overall, Fed Std 66
- Surface Treatment
- Cadmium overall and chromate overall per QQ-P-416, ty 2, cl 3
- Thread Series Designator
- 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.