- Thread Class
- 3A
- Thread Direction
- Right-hand
- Thread Length
- 0.161 inches minimum and 0.302 inches maximum
- Fastener Length
- 0.470 inches minimum and 0.500 inches maximum
- Head Style
- Flat countersunk
- Head Diameter
- 0.600 inches minimum and 0.656 inches maximum
- Internal Drive Style
- Hexagon
- Nominal Thread Diameter
- 0.312 inches
- Width Across Flats
- 0.188 inches nominal
- Thread Quantity per Inch
- 18
- Minimum Tensile Strength
- 80000 pounds per square inch
- Hardness Rating
- 80.0 rockwell B minimum overall
- Minimum Yield Strength
- 30000 pounds per square inch
- Countersink Angle
- 80.0 degrees minimum and 84.0 degrees maximum
- Material
- Steel comp 302 overall or steel comp 303 overall or steel comp 304 overall or steel comp 305 overall or steel comp 316 overall or steel comp 384 overall
- Material Document and Classification
- 66 fed std all material responses overall
- Surface Treatment
- Passivate overall
- Surface Treatment Document and Classification
- QQ-P-35 fed spec single treatment response overall
- Thread Series Designator
- UNC
- Nondefinitive Spec/STD Data
- 4 type
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.