ASME B18.2.1 5/16-18 UNC x 3 Hex Cap Screw
In stock in 6 material, grade and finish combinations.
Dimensions at 5/16-18 UNC x 3
in · ASME B18.2.1 · 2012 (R2021) edition| Dimension | Nominal | Min | Max | |
|---|---|---|---|---|
| d | Thread size | 5/16-18 UNC | – | – |
| L | Length | 3 | – | – |
| Basic major diameter | 0.3125 | – | – | |
| TPI | Threads per inch | 18 | – | – |
| Thread series | UNC | – | – | |
| Thread class | 2A | – | – | |
| E | Body diameter | – | 0.3065 | 0.3125 |
| F | Width across flats | – | 0.489 | 0.5 |
| G | Width across corners | – | 0.557 | 0.577 |
| H | Head height | – | 0.195 | 0.211 |
| J | Wrenching height | – | 0.14 | – |
| LT | Thread length (L≤6 in) | 0.875 | – | – |
| LT | Thread length (L>6 in) | 1.125 | – | – |
- Length under head
- 3 in
- Approx. weight
- ≈ 33.41 kg per 1 000 pieces · Bare steel, before coating and packing.29.9 pieces per kg
Holes for this thread
ISO 273 · ISO 2306Tap drillF (0.2570 in)
Other lengths in 5/16-18 UNC
All 143 sizes of Hex Cap Screw ASME B18.2.10.6250.750.87511.1251.251.3751.51.7522.252.52.7533.253.53.754
StandardsASME B18.2.1All sizes