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ISO 228 - Pipe Threads where Pressure-tight Joints are not made on the Threads

Requirements for thread form, dimensions, tolerances and designation for fastening pipe threads, thread sizes

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The ISO 228 "Pipe Threads where Pressure-tight Joints are not made on the Threads" consists of the following parts:

  • ISO 228-1:2000 Dimensions, tolerances and designation
  • ISO 228-2:1987 Verification by means of limit gauges
G Size
(in)
Major (Outside) Diameter (mm)
Minor (Nut) Diameter
(mm)
Core Hole Diameter
(mm)
Thread Pitch
(in)(mm)
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

Example - Typical designation for Thread according ISO 228

  • ISO 228 G 3 1/4"
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  • en: iso 228 pipe threads pressure thight
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