Square Head Plug (SPD)
| Designation | T R (PT) | ℓ/ttd> | ℓ1 | H |
|---|---|---|---|---|
| SPD-01R | 1/8 | 9 | 7 | 7 |
| SPD-02R | 1/4 | 12 | 8 | 9 |
| SPD-03R | 3/8 | 13 | 9 | 12 |
| SPD-04R | 1/2 | 16 | 10 | 14 |
| SPD-06R | 3/4 | 18 | 11 | 17 |
| SPD-08R | 1 | 20 | 12 | 19 |
| SPD-10R | 1 1/4 | 22 | 13 | 24 |
| SPD-12R | 1 1/2 | 22 | 14 | 27 |
| SPD-16R | 2 | 26 | 15 | 32 |
| Designation | T R (PT) | ℓ/ttd> | ℓ1 | H |
|---|---|---|---|---|
| SPD-01R | 1/8 | 9 | 7 | 7 |
| SPD-02R | 1/4 | 12 | 8 | 9 |
| SPD-03R | 3/8 | 13 | 9 | 12 |
| SPD-04R | 1/2 | 16 | 10 | 14 |
| SPD-06R | 3/4 | 18 | 11 | 17 |
| SPD-08R | 1 | 20 | 12 | 19 |
| SPD-10R | 1 1/4 | 22 | 13 | 24 |
| SPD-12R | 1 1/2 | 22 | 14 | 27 |
| SPD-16R | 2 | 26 | 15 | 32 |