ASME B18.3 1/4-20 UNC x 1 Socket Head Cap Screw
In stock in 2 material, grade and finish combinations.
Dimensions at 1/4-20 UNC x 1
in · ASME B18.3 · 2012 edition| Dimension | Nominal | Min | Max | |
|---|---|---|---|---|
| d | Thread size | 1/4-20 UNC | – | – |
| L | Length | 1 | – | – |
| Basic major diameter | 0.25 | – | – | |
| TPI | Threads per inch | 20 | – | – |
| Thread series | UNC | – | – | |
| Thread class | 3A | – | – | |
| D | Body diameter | – | 0.2435 | 0.25 |
| A | Head diameter | – | 0.354 | 0.375 |
| H | Head height | – | 0.244 | 0.25 |
| C | Head chamfer | – | – | 0.025 |
| J | Hex socket size | 0.188 | – | – |
| T | Key engagement | – | 0.12 | – |
| G | Socket wall | – | 0.095 | – |
| K | Head bearing edge chamfer or radius | – | – | 0.01 |
| LT | Thread length (LT) | – | 1 | – |
- Length under head
- 1 in
- Approx. weight
- ≈ 7.76 kg per 1 000 pieces · Bare steel, before coating and packing.129 pieces per kg
Holes for this thread
ISO 273 · ISO 2306Tap drill#7 (0.2010 in)
Other lengths in 1/4-20 UNC
All 123 sizes of Socket Head Cap Screw ASME B18.3StandardsASME B18.3All sizes