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Standard ISO Hardware
Fastening Joining Assembly

The following as a Tap drill size table and chart for Whitworth pipe thread per DIN ISO 228. All dimensional data given in mm (millimeters)

Related: External ISO Pipe Thread Design Chart

Whitworth Pipe Thread Section View DIN ISO 228

Nominal
Diameter
Major
Diameter
Minor Diameter
Nut
Tapping
Drill Size
Threads per Inch
Pitch
G 1/8"
9,73
8,85
8,80
28
0,907
G 1/4"
13,16
11,89
11,80
19
1,337
G 3/8"
16,66
15,39
15,25
19
1,337
G 1/2"
20,95
19,17
19,00
14
1,814
G 5/8"
22,91
21,13
21,00
14
1,814
G 3/4"
26,44
24,66
24,50
14
1,814
G 7/8"
30,20
28,42
28,25
14
1,814
G 1"
33,25
30,93
30,75
11
2,309
G 1 1/8"
37,90
35,58
35,30
11
2,309
G 1 1/4"
41,91
39,59
39,25
11
2,309
G 1 3/8"
44,32
42,00
41,70
11
2,309
G 1 1/2"
47,80
45,48
45,25
11
2,309
G 1 3/4"
53,74
51,43
51,10
11
2,309
G 2"
59,61
57,29
57,00
11
2,309
G 2 1/4"
65,71
63,39
63,10
11
2,309
G 2 1/2"
75,18
72,86
72,60
11
2,309
G 2 3/4"
81,53
79,21
78,90
11
2,309
G 3"
87,88
85,56
85,30
11
2,309
G 3 1/4"
93,98
91,66
91,50
11
2,309
G 3 1/2"
100,33
98,01
97,70
11
2,309
G 3 3/4"
106,68
104,30
104,00
11
2,309
G 4"
113,03
110,71
110,40
11
2,309

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