- Thread Class
- 3A
- Thread Direction
- Right-hand
- Thread Length
- 0.476 inches minimum and 0.526 inches maximum
- Fastener Length
- 1.361 inches minimum and 1.391 inches maximum
- Head Style
- Flat countersunk
- Head Diameter
- 0.578 inches minimum and 0.633 inches maximum
- Grip Diameter
- 0.3110 inches minimum and 0.3120 inches maximum
- Shank Unthreaded Hole Diameter
- 0.076 inches minimum first hole and 0.086 inches maximum first hole
- Internal Drive Style
- Torque-set ribbed
- Nominal Thread Diameter
- 0.312 inches
- Grip Length
- 0.865 inches minimum and 0.885 inches maximum
- Thread Quantity per Inch
- 24
- Minimum Tensile Strength
- 160000 pounds per square inch
- Countersink Angle
- 99.0 degrees minimum and 101.0 degrees maximum
- Distance from Head Largest Bearing Surface to Shank Hole Center
- 1.251 inches minimum first hole and 1.261 inches maximum first hole
- Surface Finish
- 32.0 microinches bearing surface of HEAD32.0 microinches GRIP32.0 microinches threads
- Material
- Steel comp 4140 overall or steel comp E4340 overall or steel comp 8740 overall
- Surface Treatment
- Cadmium overall and chromate overall
- Surface Treatment Document and Classification
- QQ+416, TY2CL2 fed spec single treatment response overall
- Thread Series Designator
- UNJF
- Specification/Standard Data
- 80205-NAS1580 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.