- Thread Series
- UNF
- Thread Diameter
- 0.250 inches (1/4-28)
- Threads Per Inch
- 28
- Thread Class
- 3A
- Thread Direction
- Right-hand
- Thread Length
- 0.422 inches (27/64 in.)
- Fastener Length
- 1.047 inches (1-3/64 in.)
- Grip Diameter
- 0.2485-0.2495 inches
- Material
- Alloy Steel (4140, E4340, 6150, 8735, or 8740)
- Surface Treatment
- Cadmium and Chromate (QQ-P-416, Type 2, Class 2)
- Hardness
- 36.0-40.0 Rockwell C
- Tensile Strength (Min)
- 160,000 PSI
- Head Style
- C3 Dished Hexagon
- Head Feature
- Drilled (H suffix) — for lock-wire
- Shank Hole Diameter
- 0.031 inches nominal
- Shank Type
- Close Tolerance
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.