- Thread Class
- 3A
- Thread Direction
- Right-hand
- Thread Length
- 0.403 inches maximum
- Fastener Length
- 1.638 inches minimum and 1.668 inches maximum
- Head Style
- Flat countersunk
- Head Diameter
- 0.350 inches minimum and 0.399 inches maximum
- Grip Diameter
- 0.2490 inches minimum and 0.2495 inches maximum
- Internal Drive Style
- Torque-set ribbed
- Nominal Thread Diameter
- 0.250 inches
- Grip Length
- 1.240 inches minimum and 1.260 inches maximum
- Thread Quantity per Inch
- 28
- Minimum Tensile Strength
- 160000 pounds per square inch
- Countersink Angle
- 99.0 degrees minimum and 101.0 degrees maximum
- Material
- Iron alloy 660 overall
- Material Document and Classification
- Ams 5731 assn std single material response overall or ams 5732 assn std single material response overall or ams 5337 assn std single material response overall or ams 5853 assn std single material response overall
- Surface Treatment
- Passivate overall
- Surface Treatment Document and Classification
- QQ-P-35 fed spec single treatment response overall
- Thread Series Designator
- UNJF
- Specification/Standard Data
- 80205-NAS1581 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.