This product guide contains the specification for metric threaded connector cap nuts, a series of standard parts available from Westfield Fasteners.

| Diameter, d | Head Diameter, dk | d2 | Drive Size, s | Length | Head Height, k | Length 2 |
|---|---|---|---|---|---|---|
| M6 | 15 | 9.5 | 4 | 6.5 | 2.5 | - |
| 14.8 | 8.9 | 5 | 10 | >6 | ||
| 14.4 | 7.5 | 4 / 5 | 12 | >8 | ||
| 15 | 8 | 4 | 15 | - | ||
| 14.8 | 8.9 | 5 | 17 | >13 | ||
| M8 | 20 | 9.9 | 16 | |||
| M10 | 19 | 12 | 6 | 14 | >12 | |
| 22.5 | 13 | 18 | - |