- Thread Class
- 3A
- Thread Direction
- Right-hand
- Thread Length
- 0.352 inches minimum and 0.448 inches maximum
- Fastener Length
- 1.391 inches minimum and 1.431 inches maximum
- Head Style
- Hexagon
- Head Height
- 0.172 inches minimum and 0.204 inches maximum
- Width Between Flats
- 0.490 inches minimum and 0.502 inches maximum
- Shoulder Diameter
- 0.309 inches minimum and 0.312 inches maximum first shoulder
- Shoulder Length
- 0.948 inches maximum and 0.968 inches maximum first shoulder
- Shank Unthreaded Hole Diameter
- 0.076 inches minimum and 0.086 inches maximum first hole
- Nominal Thread Diameter
- 0.250 inches
- Thread Quantity per Inch
- 28
- Minimum Tensile Strength
- 125000 pounds per square inch
- Hardness Rating
- 26.0 rockwell C minimum and 32.0 rockwell C maximum overall
- Distance from Head Largest Bearing Surface to Shank Hole Center
- 1.203 inches minimum and 1.263 inches maximum first hole
- Shoulder Shape
- Round first shoulder
- Material
- Steel comp 4140 or steel comp 8740 or steel comp 8630 or steel comp 8735 or steel comp 4130 or steel comp 4037 overall
- Surface Treatment
- Chromate and cadmium overall
- Surface Treatment Document and Classification
- QQ-P-416, ty 2, cl 2 fed spec all treatment responses overall
- Thread Series Designator
- UNJF
- Specification/Standard Data
- 80205-NAS1297 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.