- Thread Class
- 3A
- Thread Direction
- Right-hand
- Thread Length
- 1.000 inches nominal
- Fastener Length
- 1.210 inches minimum and 1.250 inches maximum
- Head Style
- Flat chamfer
- Head Diameter
- 0.365 inches minimum and 0.375 inches maximum
- Head Height
- 0.244 inches minimum and 0.250 inches maximum
- Internal Drive Style
- Hexagon
- Nominal Thread Diameter
- 0.250 inches
- Width Across Flats
- 0.1875 inches minimum and 0.1900 inches maximum
- Thread Quantity per Inch
- 28
- Minimum Tensile Strength
- 160000 pounds per square inch
- Hardness Rating
- 80.0 rockwell C minimum overall
- Minimum Yield Strength
- 30000 pounds per square inch
- Material
- Iron alloy 660 overall
- Material Document and Classification
- Ams 5731 assn std single material response or ams 5737 assn std single material response overall
- Surface Treatment
- Cadmium and chromate overall
- Surface Treatment Document and Classification
- QQ-P-416 ty 2 cl 2 fed spec single treatment response overall
- Thread Series Designator
- UNRF
- Specification/Standard Data
- 80205-NAS1351 professional/industrial association standard
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.