- Thread Class
- 3A
- Thread Direction
- Right-hand
- Thread Length
- 0.500 inches nominal
- Fastener Length
- 0.500 inches nominal
- Head Style
- Fillister
- Head Diameter
- 0.218 inches minimum and 0.226 inches maximum
- Head Height
- 0.134 inches minimum and 0.138 inches maximum
- Locking Feature
- Patch threads
- Internal Drive Style
- Hexagon
- Nominal Thread Diameter
- 0.138 inches
- Width Across Flats
- 0.109 inches nominal
- Thread Quantity per Inch
- 32
- Minimum Tensile Strength
- 180000 pounds per square inch
- Hardness Rating
- 38.0 rockwell C minimum overall and 45.0 rockwell C maximum overall
- Minimum Yield Strength
- 155000 pounds per square inch
- Special Features
- Critical item hydrogen embrittlement relief required
- Material
- Steel overall
- Material Document and Classification
- 66 fed std single material response overall
- Surface Treatment
- Zinc overall
- Surface Treatment Document and Classification
- QQ-Z-325, ty 2, cl 3 fed spec single treatment response overall
- Thread Series Designator
- UNC
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.