ASME B18.2.1 5/16-18 UNC×3.25 Hex Cap Screw6 combinations of material, property class and finish supplied in this size.
- Standard
- ASME B18.2.1 · 2012
- Thread
- 5/16-18 UNC
- Length under head
- 3-1/4 in
- Drive
- 0.5 in spanner · e 0.557 in
- Head height
- 0.211 in
- Clearance / tap drill
- F (0.2570 in)
- Weight
- 35.23 kg per 1 000 pieces · Theoretical, from nominal geometry — confirm before ordering28.4 pieces per kg
Order 5/16-18 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 | — |
Dimensions at 5/16-18 UNC×3.25
| Dimension | Value |
|---|---|
| s | 0.5 in |
| e | 0.557 in |
| k | 0.211 in |
| Weight | 35.23 kg / 1000 pcs |
| Pieces per kg | 28.4 |
Plating adds thickness — state the finish on the order.
Holes for this thread
ISO 273 · ISO 2306| Hole | Diameter |
|---|---|
| Tap drill | F (0.2570 in) |
Other lengths in 5/16-18 UNC
All sizes →| Size | kg per 1 000 pieces | |
|---|---|---|
| 5/16-18 UNC×2.75 | 30.64 | open |
| 5/16-18 UNC×3 | 32.93 | open |
| 5/16-18 UNC×3.25 | 35.23 | this page |
| 5/16-18 UNC×3.5 | 37.52 | open |
| 5/16-18 UNC×3.75 | 39.82 | open |
5/16-18 UNC x 0.6255/16-18 UNC x 0.755/16-18 UNC x 0.8755/16-18 UNC x 15/16-18 UNC x 1.1255/16-18 UNC x 1.255/16-18 UNC x 1.3755/16-18 UNC x 1.55/16-18 UNC x 1.755/16-18 UNC x 25/16-18 UNC x 2.255/16-18 UNC x 2.55/16-18 UNC x 2.755/16-18 UNC x 35/16-18 UNC x 3.55/16-18 UNC x 3.755/16-18 UNC x 4
StandardsASME B18.2.1All sizes