
| Size | Class | Code | Chamfer | L | ℓ | ℓn | ℓs | Ds | K | ℓk | No. of |
| (mm) | (mm) | (mm) | (mm) | (mm) | (mm) | (mm) | flutes Type Stock |
M18 × 1.5 △
P2 SPQ018O--L 2.5P 100 33 - 51 14 11 14 4 2
M20 × 2.5 ○
P3 SPR020R--L 2.5P 105 33 - 50 15 12 15 4 3
M20 × 1.5 △
P3 SPR020O--L 2.5P 105 33 - 50 15 12 15 4 3
M22 × 2.5 △
P3 SPR022R--L 2.5P 115 33 - 55 17 13 16 4 3
M22 × 1.5 △
P3 SPR022O--L 2.5P 115 33 - 55 17 13 16 4 3
M24 × 3 ○
P3 SPR024S--L 2.5P 120 39 - 55 19 15 18 4 3
M24 × 1.5 △
P3 SPR024O--L 2.5P 120 39 - 55 19 15 18 4 3
M27 × 3 △
P3 SPR027S--L 2.5P 130 39 - 60 20 15 18 4 3
M30 × 3.5 △
P4 SPS030T--L 2.5P 135 46 - 62 23 17 20 4 3
M30 × 2 △
P3 SPR030Q--L 2.5P 135 46 - 62 23 17 20 4 3
M30 × 1.5 △
P3 SPR030O--L 2.5P 135 46 - 62 23 17 20 4 3
For Unified Threads
| Size Class | Code Chamfer | L | ℓ | ℓn | ℓs | Ds | K | ℓk | No. of | ||||
| (mm) | (mm) | (mm) | (mm) | (mm) | (mm) | (mm) | flutes Type Stock | ||||||
| 1/4-20UNC | P2 | SPQU04N--L | 2.5P | 62 | 15 | 26 | 33 | 6 | 4.5 | 7 | 3 | 1 | △ |
| 1/4-28UNF | P2 | SPQU04K--L | 2.5P | 62 | 15 | 26 | 33 | 6 | 4.5 | 7 | 3 | 1 | △ |
| 5/16-18UNC | P2 | SPQU05O--L | 2.5P | 70 | 19 | - | 36 | 6.2 | 5 | 8 | 3 | 2 | △ |
| 5/16-24UNF | P2 | SPQU05M--L | 2.5P | 70 | 19 | - | 36 | 6.2 | 5 | 8 | 3 | 2 | △ |
| 3/8-16UNC | P2 | SPQU06P--L | 2.5P | 75 | 23 | - | 38 | 7 | 5.5 | 8 | 3 | 2 | △ |
| 3/8-24UNF | P2 | SPQU06M--L | 2.5P | 75 | 23 | - | 38 | 7 | 5.5 | 8 | 3 | 2 | △ |
| 7/16-14UNC | P3 | SPRU07Q--L | 2.5P | 82 | 26 | - | 42 | 8.5 | 6.5 | 9 | 3 | 2 | △ |
| 7/16-20UNF | P2 | SPQU07N--L | 2.5P | 82 | 26 | - | 42 | 8.5 | 6.5 | 9 | 3 | 2 | △ |
| 1/2-13UNC | P3 | SPRU08R--L | 2.5P | 88 | 26 | - | 45 | 10.5 | 8 | 11 | 3 | 2 | △ |
| 1/2-20UNF | P2 | SPQU08N--L | 2.5P | 88 | 26 | - | 45 | 10.5 | 8 | 11 | 3 | 2 | △ |
For Whitworth Threads
| Size Class | Code Chamfer | L | ℓ | ℓn | ℓs | Ds | K | ℓk | No. of | ||||
| (mm) | (mm) | (mm) | (mm) | (mm) | (mm) | (mm) | flutes Type Stock | ||||||
| 1/4W20 | P2 | SPQW04N--L | 2.5P | 62 | 15 | 26 | 33 | 6 | 4.5 | 7 | 3 | 1 | △ |
| 5/16W18 | P2 | SPQW05O--L | 2.5P | 70 | 19 | - | 36 | 6.2 | 5 | 8 | 3 | 2 | △ |
| 3/8W16 | P2 | SPQW06P--L | 2.5P | 75 | 23 | - | 38 | 7 | 5.5 | 8 | 3 | 2 | △ |
| 7/16W14 | P3 | SPRW07Q--L | 2.5P | 82 | 26 | - | 42 | 8.5 | 6.5 | 9 | 3 | 2 | △ |
| 1/2W12 | P3 | SPRW08S--L | 2.5P | 88 | 26 | - | 45 | 10.5 | 8 | 11 | 3 | 2 | △ |
| 5/8W11 | P3 | SPRW10U--L | 2.5P | 95 | 26 | - | 48 | 12.5 | 10 | 13 | 3 | 2 | △ |
| 3/4W10 | P3 | SPRW12V--L | 2.5P | 105 | 33 | - | 50 | 15 | 12 | 15 | 4 | 3 | △ |