- Thread Class
- 3A
- Thread Direction
- Right-hand
- Thread Length
- 0.899 inches minimum and 1.000 inches maximum
- Fastener Length
- 0.970 inches minimum and 1.000 inches maximum
- Head Style
- Flat chamfer
- Head Diameter
- 0.365 inches minimum and 0.375 inches maximum
- Head Height
- 0.244 inches minimum and 0.250 inches maximum
- Locking Feature
- Patch threads or pellet threads or strip threads
- Internal Drive Style
- Hexagon
- Nominal Thread Diameter
- 0.250 inches
- Width Across Flats
- 0.188 inches minimum and 0.190 inches maximum
- Thread Quantity per Inch
- 28
- 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
- Material
- Steel overall
- Surface Treatment
- Cadmium overall and chromate overall
- Surface Treatment Document and Classification
- QQ-P-416 TY2 CL2 fed spec single treatment response overall
- Thread Series Designator
- UNRF
- Specification/Standard Data
- 80205-NAS1351 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.