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| Thread | Size | Major Diameter mm | Threads Per Inch | Pitch |
| ISOMETRIC Isometric to BS3643 : 1981 |
16mm | 16 | 19.93 | 1.50 |
| 20mm | 20 | 19.93 | 1.50 | |
| 25mm | 25 | 19.93 | 1.50 | |
| 32mm | 32 | 19.93 | 1.50 | |
| 40mm | 40 | 19.93 | 1.50 | |
| 50mm | 50 | 19.93 | 1.50 | |
| 63mm | 63 | 19.93 | 1.50 | |
| 75mm | 75 | 19.93. | 1.50 | |
| P.G. P.G. To DIN 40430 : 1971 |
PG 7 | 12.50 | 20 | 1.27 |
| PG9 | 15.20 | 18 | 1.41 | |
| PG11 | 18.60 | 18 | 1.41 | |
| PG 13.5 | 20.40 | 18 | 1.41 | |
| PG 16 | 22.50 | 18 | 1.41 | |
| PG 21 | 28.30 | 16 | 1.59 | |
| PG 29 | 37.00 | 16 | 1.59 | |
| PG 36 | 47.00 | 16 | 1.59 | |
| PG 42 | 54.00 | 16 | 1.59 | |
| PG 48 | 59.30 | 16 | 1.59 | |
| IMPERIAL Imperial to BS31 : 1940(1979) |
5/8" | 15.88 | 18 | 1.41 |
| 3/4" | 19.05 | 16 | 1.59 | |
| 1" | 25.40 | 16 | 1.59 | |
| 1.1/4" | 31.75 | 16 | 1.59 | |
| 1.1/2" | 63.50 | 14 | 1.81 | |
| 2" | 50.80 | 14 | 1.81 | |
| 2.1/2" | 63.50 | 14 | 1.81 | |
| 3" | 76.20 | 14 | 1.81 | |
| N.P.T National Pipe Thread to ANSI/SME :1993 |
1/8" | 10.30 | 27 | 0.94 |
| 1/4" | 13.72 | 18 | 1.41 | |
| 3/8" | 17.15 | 18 | 1.41 | |
| 1/2" | 21.34 | 14 | 1.81 | |
| 3/4" | 26.67 | 14 | 1.81 | |
| 1" | 33.40 | 12 | 2.20 | |
| 1.1/4" | 42.16 | 12 | 2.20 | |
| 1.1/2" | 48.26 | 12 | 2.20 | |
| 2" | 60.33 | 12 | 2.20 | |
| 2.1/2" | 73.03 | 8 | 3.175 | |
| 3" | 88.90 | 8 | 3.175 | |
| 4" | 114.30 | 8 | 3.175 | |
| B.S.P British Standard Pipe BS21 : 1985 |
1/8" | 9.73 | 28 | 0.91 |
| 1/4" | 13.16 | 19 | 1.34 | |
| 3/8" | 16.66 | 19 | 1.34 | |
| 1/2' | 20.96 | 14 | 1.81 | |
| 5/8" | 22.91 | 14 | 1.81 | |
| 3/4" | 26.44 | 14 | 1.81 | |
| 1" | 33.25 | 11 | 2.31 | |
| 1.1/4" | 41.91 | 11 | 2.31 | |
| 1.1/2" | 47.80 | 11 | 2.31 | |
| 2" | 59.61 | 11 | 2.31 | |
| 2.1/2" | 75.18 | 11 | 2.31 | |
| 3" | 87.88 | 11 | 2.31 | |
| 4" | 113.03 | 11 | 2.31 |