- Thread Class
- 3A
- Thread Direction
- Right-hand
- Thread Length
- 0.220 inches minimum and 0.260 inches maximum
- Fastener Length
- 0.330 inches minimum and 0.350 inches maximum
- Head Style
- Flat chamfer
- Head Diameter
- 0.428 inches minimum and 0.448 inches maximum
- Head Height
- 0.170 inches minimum and 0.190 inches maximum
- Shoulder Diameter
- 0.307 inches minimum first shoulder and 0.317 inches maximum first shoulder
- Shoulder Length
- 0.030 inches minimum first shoulder and 0.040 inches maximum first shoulder
- Hole Diameter
- 0.071 inches nominal
- Internal Drive Style
- Hexagon
- Nominal Thread Diameter
- 0.250 inches
- Width Across Flats
- 0.219 inches minimum and 0.221 inches maximum
- Thread Quantity per Inch
- 28
- Hardness Rating
- 30.0 rockwell C minimum overall and 34.0 rockwell C maximum overall
- Hole Configuration Style
- Round longitudinal hole
- Shoulder Shape
- Round first shoulder
- Special Features
- Thread relief under shoulder 0.060 in. min, 0.070 in. max lg, 0.196 in. min, 0.200 in. max dia
- Material
- Steel overall
- Material Document and Classification
- Ams 6382, comp 4140 assn std single material response overall
- Surface Treatment
- Oxide overall
- Surface Treatment Document and Classification
- Ams 2485 assn std single treatment response overall
- Thread Series Designator
- UNF
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.