- Thread Class
- 3A
- Thread Direction
- Right-hand
- Thread Length
- 0.496 inches minimum and 0.571 inches maximum
- Fastener Length
- 0.949 inches minimum and 0.994 inches maximum
- Head Style
- Flat countersunk
- Head Diameter
- 0.452 inches minimum and 0.510 inches maximum
- Internal Drive Style
- Cross recess type 1
- Nominal Thread Diameter
- 0.250 inches
- Thread Quantity per Inch
- 28
- Minimum Tensile Strength
- 140000 pounds per square inch
- Hardness Rating
- 248.0 brinell standard minimum and 341.0 brinell standard maximum
- Countersink Angle
- 99.0 degrees minimum and 101.0 degrees maximum
- Screw Material
- Iron alloy 660
- Screw Material Document and Classification
- Ams assn std all material responses
- Thread Series Designator
- UNF
- Specification/Standard Data
- 80205-NAS560 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.