
| 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 | 2.5P | 62 | 15 | 26 | 33 | 6 | 4.5 | 7 | 3 | 3 | ◎ |
| 1/4-28UNF | P2 | SPQU04K | 2.5P | 62 | 15 | 26 | 33 | 6 | 4.5 | 7 | 3 | 3 | ○ |
| 1/4-32UNEF | P2 | SPQU04J | 2.5P | 62 | 15 | 26 | 33 | 6 | 4.5 | 7 | 3 | 3 | △ |
| 5/16-18UNC | P2 | SPQU05O | 2.5P | 70 | 19 | - | 36 | 6.2 | 5 | 8 | 3 | 5 | ◎ |
| 5/16-24UNF | P2 | SPQU05M | 2.5P | 70 | 19 | - | 36 | 6.2 | 5 | 8 | 3 | 5 | ○ |
| 5/16-32UNEF | P2 | SPQU05J | 2.5P | 70 | 19 | - | 36 | 6.2 | 5 | 8 | 3 | 5 | △ |
| 3/8-16UNC | P2 | SPQU06P | 2.5P | 75 | 23 | - | 38 | 7 | 5.5 | 8 | 3 | 5 | ◎ |
| 3/8-24UNF | P2 | SPQU06M | 2.5P | 75 | 23 | - | 38 | 7 | 5.5 | 8 | 3 | 5 | ○ |
| 7/16-14UNC | P3 | SPRU07Q | 2.5P | 82 | 26 | - | 42 | 8.5 | 6.5 | 9 | 3 | 5 | ○ |
| 7/16-20UNF | P2 | SPQU07N | 2.5P | 82 | 26 | - | 42 | 8.5 | 6.5 | 9 | 3 | 5 | ○ |
| 1/2-13UNC | P3 | SPRU08R | 2.5P | 88 | 26 | - | 45 | 10.5 | 8 | 11 | 3 | 5 | ○ |
| 1/2-20UNF | P2 | SPQU08N | 2.5P | 88 | 26 | - | 45 | 10.5 | 8 | 11 | 3 | 5 | ○ |
| 9/16-12UNC | P3 | SPRU09S | 2.5P | 95 | 26 | - | 48 | 12.5 | 10 | 13 | 3 | 5 | △ |
| 9/16-18UNF | P2 | SPQU09O | 2.5P | 95 | 26 | - | 48 | 12.5 | 10 | 13 | 3 | 5 | ○ |
| 9/16-24UNEF | P2 | SPQU09M | 2.5P | 95 | 26 | - | 48 | 12.5 | 10 | 13 | 3 | 5 | △ |
| 5/8-11UNC | P3 | SPRU10U | 2.5P | 95 | 26 | - | 48 | 12.5 | 10 | 13 | 3 | 5 | ○ |
| 5/8-18UNF | P2 | SPQU10O | 2.5P | 95 | 26 | - | 48 | 12.5 | 10 | 13 | 3 | 5 | ○ |
| 5/8-24UNEF | P2 | SPQU10M | 2.5P | 95 | 26 | - | 48 | 12.5 | 10 | 13 | 3 | 5 | △ |
| 3/4-10UNC | P3 | SPRU12V | 2.5P | 105 | 33 | - | 50 | 15 | 12 | 15 | 4 | 7 | ○ |
| 3/4-16UNF | P3 | SPRU12P | 2.5P | 105 | 33 | - | 50 | 15 | 12 | 15 | 4 | 7 | ○ |
| 3/4-20UNEF | P2 | SPQU12N | 2.5P | 105 | 33 | - | 50 | 15 | 12 | 15 | 4 | 7 | △ |
| 7/8-9UNC | P3 | SPRU14W | 2.5P | 115 | 33 | - | 55 | 17 | 13 | 16 | 4 | 7 | ○ |
| 7/8-14UNF | P3 | SPRU14Q | 2.5P | 115 | 33 | - | 55 | 17 | 13 | 16 | 4 | 7 | ○ |
| 7/8-20UNEF | P2 | SPQU14N | 2.5P | 115 | 33 | - | 55 | 17 | 13 | 16 | 4 | 7 | △ |
| 1 -8UNC | P3 | SPRU16X | 2.5P | 125 | 39 | - | 58 | 19 | 15 | 18 | 4 | 7 | ○ |
| 1 -12UNF | P3 | SPRU16S | 2.5P | 125 | 39 | - | 58 | 19 | 15 | 18 | 4 | 7 | △ |
| 1 -14UNS | P3 | SPRU16Q | 2.5P | 125 | 39 | - | 58 | 19 | 15 | 18 | 4 | 7 | △ |
| 1 -20UNEF | P2 | SPQU16N | 2.5P | 125 | 39 | - | 58 | 19 | 15 | 18 | 4 | 7 | △ |
| 1 1/8-7UNC | P4 | SPSU18Y | 2.5P | 135 | 46 | - | 62 | 23 | 17 | 20 | 4 | 7 | △ |
| 1 1/8-12UNF | P3 | SPRU18S | 2.5P | 135 | 46 | - | 62 | 23 | 17 | 20 | 4 | 7 | △ |
| 1 1/4-7UNC | P4 | SPMSU20Y | 2.5P | 145 | 46 | - | 67 | 24 | 19 | 22 | 4 | 7 | △ |
| 1 1/4-8UN | P3 | SPMRU20X | 2.5P | 145 | 46 | - | 67 | 24 | 19 | 22 | 4 | 7 | △ |
| 1 1/4-12UNF | P3 | SPMRU20S | 2.5P | 145 | 46 | - | 67 | 24 | 19 | 22 | 4 | 7 | △ |
| 1 3/8-6UNC | P4 | SPMSU22Z | 2.5P | 155 | 52 | - | 71 | 28 | 21 | 24 | 4 | 7 | △ |
| 1 3/8-8UN | P3 | SPMRU22X | 2.5P | 155 | 52 | - | 71 | 28 | 21 | 24 | 4 | 7 | △ |
| 1 3/8-12UNF | P3 | SPMRU22S | 2.5P | 155 | 52 | - | 71 | 28 | 21 | 24 | 4 | 7 | △ |
| 1 1/2-6UNC | P4 | SPMSU24Z | 2.5P | 165 | 52 | - | 76 | 30 | 23 | 26 | 4 | 7 | △ |
| 1 1/2-12UNF | P3 | SPMRU24S | 2.5P | 165 | 52 | - | 76 | 30 | 23 | 26 | 4 | 7 | △ |
| 1 3/4-5UNC | P4 | SPMSU280 | 2.5P | 180 | 59 | - | 83 | 35 | 26 | 30 | 4 | 7 | △ |
| 1 3/4-12UN | P3 | SPMRU28S | 2.5P | 180 | 59 | - | 83 | 35 | 26 | 30 | 4 | 7 | △ |
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 | ||||||
| 1/8W40 | P1 | SPPW02H | 2.5P | 52 | 11 | 17 | 29 | 5 | 4 | 7 | 3 | 3 | ○ |
| 5/32W32 | P2 | SPQW2HJ | 2.5P | 52 | 11 | 17 | 29 | 5 | 4 | 7 | 3 | 3 | △ |
| 3/16W24 | P2 | SPQW03M | 2.5P | 60 | 13 | 21 | 33 | 5.5 | 4.5 | 7 | 3 | 3 | ○ |
| 7/32W24 | P2 | SPQW3HM | 2.5P | 62 | 15 | 26 | 33 | 6 | 4.5 | 7 | 3 | 3 | △ |
| 1/4W20 | P2 | SPQW04N | 2.5P | 62 | 15 | 26 | 33 | 6 | 4.5 | 7 | 3 | 3 | ○ |
| 5/16W18 | P2 | SPQW05O | 2.5P | 70 | 19 | - | 36 | 6.2 | 5 | 8 | 3 | 5 | ○ |
| 3/8W16 | P2 | SPQW06P | 2.5P | 75 | 23 | - | 38 | 7 | 5.5 | 8 | 3 | 5 | ○ |
| 7/16W14 | P3 | SPRW07Q | 2.5P | 82 | 26 | - | 42 | 8.5 | 6.5 | 9 | 3 | 5 | △ |