Internal Metric Thread Table Chart Fastener Sizes M235 - M600

ISO Metric Hardware Engineering Data
Fastener and Screw / Bolt Design, Formula and Calculations

The following table chart are standard metric internal thread sizes M235 - M600 per. ANSI/ASME B1.13M-1995. These thread sizes and classes represent bolts and screws, as well, as other standard internal threads. Do not use these values for standard metric internal thread design. All units in mm.

Metric Internal and External threads

Where:

H = P ( 31/2 / 2 ) = 0.866025 P
or
0.125H = 0.108253P

ISO Metric
Thread Designation
Pitch
Metric Internal Threads
Specification Table
Tolerance Class
Minor Dia
Pitch Dia
Major Dia
Tap Drill
Min
Max
Min
Max
Min
Max
Basic
M235x6
6
6H
228.505
229.305
231.103
231.578
235.000
236.341
229.000
M235x4
4
6H
230.670
231.270
232.402
232.777
235.000
235.952
231.000
M235x3
3
6H
231.752
232.252
233.051
233.386
235.000
235.768
232.000
M240x8
8
6H
231.340
232.340
234.804
235.279
240.000
241.630
232.000
M240x6
6
6H
233.505
234.305
236.103
236.528
240.000
241.291
234.000
M240x4
4
6H
235.670
236.270
237.402
237.777
240.000
240.952
236.000
M240x3
3
6H
236.752
237.252
238.051
238.386
240.000
240.768
237.000
M240x2
2
6H
237.835
238.210
238.701
238.981
240.000
240.569
238.000
M245x6
6
6H
238.505
239.305
241.103
241.528
245.000
246.291
239.000
M245x4
4
6H
240.670
241.270
242.402
242.777
245.000
245.952
241.000
M245x3
3
6H
241.752
242.252
243.051
243.386
245.000
245.768
242.000
M245x2
2
6H
242.835
243.210
243.701
243.981
245.000
245.569
243.000
M250x8
8
6H
241.340
242.340
244.804
245.279
250.000
251.630
242.000
M250x6
6
6H
243.505
244.305
246.103
246.528
250.000
251.291
244.000
M250x4
4
6H
245.670
246.270
247.402
247.777
250.000
250.952
246.000
M250x3
3
6H
246.752
247.252
248.051
248.386
250.000
250.768
247.000
M250x2
2
6H
247.835
248.210
248.701
248.981
250.000
250.569
248.000
M255x6
6
6H
248.505
249.305
251.103
251.578
255.000
256.341
249.000
M255x4
4
6H
250.670
251.270
252.402
252.777
255.000
255.952
251.000
M255x3
3
6H
251.752
252.252
253.051
253.386
255.000
255.768
252.000
M260x8
8
6H
251.340
252.340
254.804
255.279
260.000
261.630
252.000
M260x6
6
6H
253.505
254.305
256.103
256.528
260.000
261.291
254.000
M260x4
4
6H
255.670
256.270
257.402
257.777
260.000
260.952
256.000
M260x3
3
6H
256.752
257.252
258.051
258.386
260.000
260.768
257.000
M265x6
6
6H
258.505
259.305
261.103
261.528
265.000
266.291
259.000
M265x4
4
6H
260.670
261.270
262.402
262.777
265.000
265.952
261.000
M265x3
3
6H
261.752
262.252
263.051
263.386
265.000
265.768
262.000
M270x6
6
6H
263.505
264.305
266.103
266.528
270.000
271.291
264.000
M270x4
4
6H
265.670
266.270
267.402
267.777
270.000
270.952
266.000
M275x6
6
6H
268.505
269.305
271.103
271.528
275.000
276.291
269.000
M275x3
3
6H
271.752
272.252
273.051
273.386
275.000
275.768
272.000
M280x6
6
6H
273.505
274.305
276.103
276.528
280.000
281.291
274.000
M280x3
3
6H
276.752
277.252
278.051
278.386
280.000
280.768
277.000
M285x4
4
6H
280.670
281.270
282.402
282.777
285.000
285.952
281.000
M290x6
6
6H
283.505
284.305
286.103
286.528
290.000
291.291
284.000
M290x3
3
6H
286.752
287.252
288.051
288.386
290.000
290.768
287.000
M295x4
4
6H
290.670
291.270
292.402
292.777
295.000
295.952
291.000
M300x6
6
6H
293.505
294.305
296.103
296.528
300.000
301.291
294.000
M310x4
4
6H
305.670
306.270
307.402
307.777
310.000
310.952
306.000
M330x4
4
6H
325.670
326.270
327.402
327.777
330.000
330.952
326.000
M350x4
4
6H
345.670
346.270
347.402
347.777
350.000
350.952
346.000
M370x4
4
6H
365.670
366.270
367.402
367.802
370.000
370.977
366.000
M390x4
4
6H
385.670
386.270
387.402
387.802
390.000
390.977
386.000
M420x6
6
6H
413.505
414.305
416.103
416.578
420.000
421.341
414.000
M460x6
6
6H
453.505
454.305
456.103
456.578
460.000
461.341
454.000
M480x6
6
6H
473.505
474.305
476.103
476.578
480.000
481.341
474.000
M500x6
6
6H
493.505
494.305
496.103
496.578
500.000
501.341
494.000
M520x6
6
6H
513.505
514.305
516.103
516.578
520.000
521.341
514.000
M540x6
6
6H
533.505
534.305
536.103
536.578
540.000
541.341
534.000
M560x6
6
6H
553.505
554.305
556.103
556.578
560.000
561.341
554.000
M580x6
6
6H
573.505
574.305
576.103
576.578
580.000
581.341
574.000
M600x6
6
6H
593.505
594.305
596.103
596.578
600.000
601.341
594.000

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