- Thread Class
- 3A
- Thread Direction
- Right-hand
- Thread Length
- 0.400 inches minimum and 0.450 inches maximum
- Fastener Length
- 2.410 inches minimum and 2.440 inches maximum
- Head Style
- Flat countersunk
- Head Diameter
- 0.449 inches minimum and 0.507 inches maximum
- Locking Feature
- Strip threads
- Grip Diameter
- 0.2485 inches minimum and 0.2495 inches maximum
- Internal Drive Style
- Offset cruciform (torque set)
- Nominal Thread Diameter
- 0.250 inches
- Grip Length
- 1.990 inches minimum and 2.010 inches maximum
- Thread Quantity per Inch
- 28
- Minimum Tensile Strength
- 160000 pounds per square inch
- Hardness Rating
- 36.0 rockwell C minimum overall and 40.0 rockwell C maximum overall
- Countersink Angle
- 99.0 degrees minimum and 101.0 degrees maximum
- Surface Finish
- 32.0 microinches bearing surface of head
- Surface Finish
- 32.0 microinches grip
- Surface Finish
- 32.0 microinches threads
- Material
- Plastic locking feature
- Material
- Steel comp 4140 fastener or steel comp E4340 fastener or steel comp 8740 fastener
- Material Document and Classification
- MIL-S-5626 mil spec 1ST material response fastener or MIL-S-5000 mil spec 2ND material response fastener or MIL-S-6049 mil spec 3RD material response fastener
- Surface Treatment
- Cadmium fastener and chromate fastener
- Surface Treatment Document and Classification
- QQ-P-416 TY2 CL2 fed spec single treatment response fastener
- Thread Series Designator
- UNJF
- Specification/Standard Data
- 80205-NAS1164 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.