ASME B18.2.1 1/4-20 UNC×0.5 Hex Cap Screw6 combinations of material, property class and finish supplied in this size.
- Standard
- ASME B18.2.1 · 2012
- Thread
- 1/4-20 UNC
- Length under head
- 1/2 in
- Drive
- 0.438 in spanner · e 0.488 in
- Head height
- 0.163 in
- Clearance / tap drill
- #7 (0.2010 in)
- Weight
- 6.14 kg per 1 000 pieces · Theoretical, from nominal geometry — confirm before ordering163 pieces per kg
Order 1/4-20 UNC×0.5
Set a quantity on as many rows as you need. Not listed? We make to your drawing — send it with the enquiry.
| Material | Class | Finish | Quantity | Net weight |
|---|---|---|---|---|
| Carbon Steel | Grade 5 | Zinc Plated | — | |
| Carbon Steel | Grade 5 | Blackened | — | |
| Carbon Steel | Grade 5 | Plain | — | |
| Carbon Steel | Grade 8 | Zinc Plated | — | |
| Carbon Steel | Grade 8 | Blackened | — | |
| Carbon Steel | Grade 8 | Plain | — |
Dimensions at 1/4-20 UNC×0.5
| Dimension | Value |
|---|---|
| s | 0.438 in |
| e | 0.488 in |
| k | 0.163 in |
| Weight | 6.14 kg / 1000 pcs |
| Pieces per kg | 163 |
Plating adds thickness — state the finish on the order.
Holes for this thread
ISO 273 · ISO 2306| Hole | Diameter |
|---|---|
| Tap drill | #7 (0.2010 in) |
Other lengths in 1/4-20 UNC
All sizes →| Size | kg per 1 000 pieces | |
|---|---|---|
| 1/4-20 UNC×0.5 | 6.14 | this page |
| 1/4-20 UNC×0.625 | 6.88 | open |
| 1/4-20 UNC×0.75 | 7.61 | open |
| 1/4-20 UNC×0.875 | 8.34 | open |
| 1/4-20 UNC×1 | 9.08 | open |
1/4-20 UNC x 0.6251/4-20 UNC x 0.751/4-20 UNC x 0.8751/4-20 UNC x 11/4-20 UNC x 1.1251/4-20 UNC x 1.251/4-20 UNC x 1.3751/4-20 UNC x 1.51/4-20 UNC x 1.751/4-20 UNC x 21/4-20 UNC x 2.251/4-20 UNC x 2.51/4-20 UNC x 2.751/4-20 UNC x 31/4-20 UNC x 3.25
StandardsASME B18.2.1All sizes