ASME B18.2.1 1-8 UNC×3.25 Hex Cap Screw8 combinations of material, property class and finish supplied in this size.
- Standard
- ASME B18.2.1 · 2012
- Thread
- 1-8 UNC
- Length under head
- 3-1/4 in
- Drive
- 1.5 in spanner · e 1.675 in
- Head height
- 0.627 in
- Clearance / tap drill
- 7/8 (0.8750 in)
- Weight
- 449.96 kg per 1 000 pieces · Theoretical, from nominal geometry — confirm before ordering2.2 pieces per kg
Order 1-8 UNC×3.25
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 | — | |
| Carbon Steel | Grade A | Hot Dip Galvanized | — | |
| Carbon Steel | Grade A | Plain | — |
Dimensions at 1-8 UNC×3.25
| Dimension | Value |
|---|---|
| s | 1.5 in |
| e | 1.675 in |
| k | 0.627 in |
| Weight | 449.96 kg / 1000 pcs |
| Pieces per kg | 2.2 |
Plating adds thickness — state the finish on the order.
Holes for this thread
ISO 273 · ISO 2306| Hole | Diameter |
|---|---|
| Tap drill | 7/8 (0.8750 in) |
Other lengths in 1-8 UNC
All sizes →| Size | kg per 1 000 pieces | |
|---|---|---|
| 1-8 UNC×2.75 | 402.98 | open |
| 1-8 UNC×3 | 426.47 | open |
| 1-8 UNC×3.25 | 449.96 | this page |
| 1-8 UNC×3.5 | 473.45 | open |
| 1-8 UNC×3.75 | 496.94 | open |
1-8 UNC x 21-8 UNC x 2.251-8 UNC x 2.51-8 UNC x 2.751-8 UNC x 31-8 UNC x 3.51-8 UNC x 3.751-8 UNC x 41-8 UNC x 4.51-8 UNC x 51-8 UNC x 5.5
StandardsASME B18.2.1All sizes