- Thread Class
- 3A
- Thread Direction
- Right-hand
- Thread Length
- 0.475 inches minimum and 0.525 inches maximum
- Fastener Length
- 0.985 inches minimum and 1.015 inches maximum
- Head Style
- Bevel-conical
- Head Diameter
- 0.430 inches minimum and 0.438 inches maximum
- Head Height
- 0.226 inches nominal
- Shank Unthreaded Hole Diameter
- 0.076 inches minimum first hole and 0.081 inches maximum first hole
- Internal Drive Style
- Hexagon
- Nominal Thread Diameter
- 0.250 inches
- Width Across Flats
- 0.219 inches minimum and 0.221 inches maximum
- Thread Quantity per Inch
- 28
- Minimum Tensile Strength
- 160000 pounds per square inch
- Distance from Head Largest Bearing Surface to Shank Hole Center
- 0.834 inches minimum first hole and 0.854 inches maximum first hole
- Material
- Steel comp E4340 overall or steel comp 8740 overall or steel comp 6150 overall or steel comp 3140 overall or steel comp 3135 overall
- Surface Treatment
- Cadmium overall and chromate overall
- Surface Treatment Document and Classification
- QQ-P-416, type 2 cl 3 fed spec single treatment response overall
- Thread Series Designator
- UNJF
- Specification/Standard Data
- 80205-NAS144 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.