- Thread Class
- 3A
- Thread Direction
- Right-hand
- Thread Length
- 0.403 inches nominal
- Fastener Length
- 2.036 inches minimum and 2.066 inches maximum
- Head Style
- Flat countersunk
- Head Diameter
- 0.464 inches minimum and 0.507 inches maximum
- Grip Diameter
- 0.2485 inches minimum and 0.2495 inches maximum
- Shank Unthreaded Hole Diameter
- 0.076 inches minimum grip and 0.086 inches maximum grip
- Internal Drive Style
- Cross recess type III
- Nominal Thread Diameter
- 0.250 inches
- Grip Length
- 0.240 inches minimum and 0.260 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
- Distance from Head Largest Bearing Surface to Shank Hole Center
- 1.910 inches minimum grip and 1.960 inches maximum grip
- Material
- Steel comp 4140 overall and steel comp 4340 overall and steel comp 8740 overall
- Surface Treatment
- Cadmium overall and chromate overall
- Thread Series Designator
- UNF
- 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.