- Thread Class
- 3A
- Thread Direction
- Right-hand
- Thread Length
- 0.291 inches minimum and 0.341 inches maximum
- Fastener Length
- 2.926 inches minimum and 2.956 inches maximum
- Head Style
- Pan no. 2
- Head Diameter
- 0.473 inches minimum and 0.492 inches maximum
- Head Height
- 0.162 inches minimum and 0.175 inches maximum
- Internal Drive Style
- Cross recess type 1
- Nominal Thread Diameter
- 0.250 inches
- Thread Quantity per Inch
- 28
- Minimum Tensile Strength
- 160000 pounds per square inch
- Hardness Rating
- 36.0 rockwell C minimum and 40.0 rockwell C maximum
- Screw Material
- Steel comp 4140 or steel comp E4340 or steel comp 8740
- Screw Material Document and Classification
- MIL-S-5626 mil spec 1ST material response or MIL-S-5000 mil spec 2ND material response or MIL-S-6049 mil spec 3RD material response
- Screw Surface Treatment
- Cadmium and chromate
- Screw Surface Treatment Document and Classification
- QQ-P-416 ty 2 cl 2 fed spec single treatment response
- Thread Series Designator
- UNJF
- Specification/Standard Data
- 80205-NAS623 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.