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Thread Conversion

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

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