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INCH AND METRIC THREAD SIZE
CHART
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Outer diameter, mm
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thread pitch
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Thread
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Internal diameter, mm
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Inch G, R
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Metric
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Inch ORFS, UNF, JIC
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Inch NPTF, NPSM
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9,3-9,7
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28 threads
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1/8"
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8,5-8,9
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9,3-9,7
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29 threads
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1/8"
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8,5-8,9
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9,7-9,9
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õ 1,5
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M 10x1,5
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8,2-8,6
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10,9-11,1
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20 threads
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7/16"-20
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9,7-10,0
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11,6-11,9
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õ 1,5
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M 12x1,5
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10,2-10,6
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12,4-12,7
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20 threads
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1/2"-20
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11,3-11,6
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12,9-13,1
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19 threads
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1/4"
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11,4-11,9
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12,9-13,1
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18 threads
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1/4"
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11,4-11,9
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13,6-13,9
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x 1,5
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M 14x1,5
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12,2-12,6
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14,0-14,25
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18 threads
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9/16"-18
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12,7-13,0
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15,6-15,9
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x 1,5
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M 16x1,5
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14,2-14,6
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16,3-16,6
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19 threads
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3/8"
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14,9-15,4
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16,3-16,6
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18 threads
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3/8"
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14,9-15,4
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17,2-17,5
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16 threads
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11/16"-16
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15,8-16,0
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17,6-17,9
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x 1,5
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M 18x1,5
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16,2-16,6
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18,7-19,0
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16 threads
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3/4"-16
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17,3-17,6
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19,6-19,9
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x 1,5
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M 20x1,5
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18,2-18,6
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20,5-20,7
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16 threads
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13/16"-16
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18,8-19,3
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20,5-20,9
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14 threads
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1/2"
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1/2"
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18,6-19,0
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21,6-21,9
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x 1,5
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M 22x1,5
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20,2-20,6
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22,0-22,2
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14 threads
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7/8"-14
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20,2-20,5
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22,6-22,9
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14 threads
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5/8"
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5/8"
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20,6-21,0
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23,6-23,9
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x 1,5
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M 24x1,5
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22,2-22,8
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25,1-25,4
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14 threads
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1"-14
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23,6-23,8
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25,6-25,9
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x 1,5
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M 26x1,5
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24,2-24,6
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26,1-26,4
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14 threads
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3/4"
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3/4"
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24,1-24,5
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26,6-26,9
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12 threads
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1.1/16"-12
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24,3-24,7
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29,6-29,9
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x 2
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M 30x2
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27,4-27,8
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29,8-30,1
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12 threads
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1.1/16"-12
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27,6-27,9
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29,6-29,9
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x 1,5
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M 30x1,5
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28,2-28,6
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31,6-31,9
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x 2
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M 32x2
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29,4-29,9
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33,0-33,2
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11 threads
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1"
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30,3-30,8
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33,0-33,3
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12 threads
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1.5/16"-12
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30,8-31,2
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32,9-33,4
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11,5 threads
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1"
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30,3-30,8
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35,6-35,9
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x 2
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M 36x2
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33,4-33,8
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36,1-36,4
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12 threads
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1.7/16"-12
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34,4-34,7
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37,6-37,9
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x 1,5
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M 38x1,5
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36,2-36,6
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40,9-41,2
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12 threads
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1.5/8"-12
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38,7-39,1
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41,6-41,9
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x 2
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M 42x2
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39,4-39,8
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41,5-41,9
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11 threads
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1.1/4"
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39,0-39,5
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41,4-42,0
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11 threads
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1.1/4"
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39,2-39,6
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42,5-42,7
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16 threads
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1.11/16"-16
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40,7-41,0
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44,6-44,9
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x 2
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M 45x2
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42,4-42,8
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44,6-44,9
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x 1,5
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M 45x1,5
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43,2-43,6
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47,3-47,6
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12 threads
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1.7/8"-14
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45,1-45,5
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47,4-47,8
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11 threads
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1.1/2"
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44,8-45,3
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47,3-47,9
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11,5 threads
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1.1/2"
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45,1-45,5
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51,6-51,9
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x 2
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M 52x2
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49,4-49,6
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51,6-51,9
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x 1,5
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M 52x1,5
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50,2-50,6
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59,2-59,6
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11 threads
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2"
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56,2-56,6
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63,1-63,4
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12 threads
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2"-12
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61,1-61,4
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