- Thread Class
- 3A
- Thread Direction
- Right-hand
- Thread Length
- 0.670 inches minimum and 0.750 inches maximum
- Fastener Length
- 0.720 inches minimum and 0.750 inches maximum
- Head Style
- Flat chamfer
- Head Diameter
- 0.218 inches minimum and 0.226 inches maximum
- Head Height
- 0.134 inches minimum and 0.138 inches maximum
- Hole Diameter
- 0.035 inches minimum and 0.050 inches maximum
- Internal Drive Style
- Hexagon
- Nominal Thread Diameter
- 0.138 inches
- Width Across Flats
- 0.1094 inches minimum and 0.1111 inches maximum
- Hole Quantity
- 2
- Hole Type
- Drilled
- Thread Quantity per Inch
- 40
- Hardness Rating
- 80.0 rockwell C minimum overall
- Hole Configuration Style
- Round internal hexagon
- Material
- Iron alloy 660 overall
- Material Document and Classification
- Ams 5731 assn std single material response and ams 5737 assn std single material response overall
- Surface Treatment
- Passivate overall
- Surface Treatment Document and Classification
- QQ-P-35 fed spec single treatment response overall
- Thread Series Designator
- UNRF
- Specification/Standard Data
- 80205-NAS1321 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.