- Thread Class
- 3A
- Thread Direction
- Right-hand
- Thread Length
- 0.476 inches minimum and 0.526 inches maximum
- Fastener Length
- 0.861 inches minimum and 0.891 inches maximum
- Head Style
- Flat countersunk
- Head Diameter
- 0.429 inches minimum and 0.479 inches maximum
- Grip Diameter
- 0.3110 inches minimum and 0.3120 inches maximum
- Internal Drive Style
- Offset cruciform (torque set)
- Nominal Thread Diameter
- 0.312 inches
- Grip Length
- 0.365 inches minimum and 0.385 inches maximum
- Thread Quantity per Inch
- 24
- Minimum Tensile Strength
- 160000 pounds per square inch
- Countersink Angle
- 100.0 degrees nominal
- Surface Finish
- 32.0 microinches grip
- Surface Finish
- 32.0 microinches threads
- Material
- Iron alloy 660 overall
- Surface Treatment
- Passivate 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.