- Thread Class
- 3A
- Thread Direction
- Right-hand
- Thread Length
- 0.875 inches minimum
- Fastener Length
- 1.210 inches minimum and 1.250 inches maximum
- Head Style
- Flat chamfer
- Head Diameter
- 0.262 inches minimum and 0.270 inches maximum
- Head Height
- 0.159 inches minimum and 0.164 inches maximum
- Width Between Flats
- 0.1406 inches minimum and 0.1426 inches maximum
- Nominal Thread Diameter
- 0.164 inches
- Thread Quantity per Inch
- 36
- Minimum Tensile Strength
- 160000 pounds per square inch
- Hardness Rating
- 33.0 rockwell C minimum and 42.0 rockwell C maximum
- Screw Material
- Iron alloy 660
- Screw Material Document and Classification
- AMS5731 assn std single material response and AMS5737 assn std single material response
- Screw Surface Treatment
- Passivate
- Screw Surface Treatment Document and Classification
- QQ-P-35 fed spec single treatment response
- Thread Series Designator
- UNRF
- Specification/Standard Data
- 80205-NAS1531 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.