External Metric ISO Thread Table Chart Sizes M180 - M255

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

The following are metric external thread size table chart for sizes M 180 to M 255 per. ANSI/ASME B1.13M-1995. These thread sizes and classes represent bolts and screws, as well, as other standard external threads. Do not use these values for standard metric internal thread designs. All units in mm.

ISO Metric
Thread Designation
Pitch
External Threads
Tolerance Class
Major Dia
Pitch Dia
Minor Dia
Max
Min
Max
Min
Max
Min
M180x8
8
6g
179.900
179.190
174.704
174.369
171.240
169.441
M180x8
8
4g6g
179.900
179.190
174.704
174.492
171.240
169.564
M180x6
6
6g
179.920
179.320
176.023
175.723
173.425
172.027
M180x6
6
4g6g
179.920
179.320
176.023
175.833
173.425
172.137
M180x4
4
6g
179.940
179.465
177.342
177.092
175.610
174.628
M180x4
4
4g6g
179.940
179.465
177.342
177.182
175.610
174.718
M180x3
3
6g
179.952
179.577
178.003
177.779
176.704
175.931
M180x3
3
4g6g
179.952
179.577
178.003
177.863
176.704
176.015
M180x2
2
6g
179.962
179.682
178.663
178.473
177.797
177.241
M180x2
2
4g6g
179.962
179.682
178.663
178.543
177.797
177.311
M185x6
6
6g
184.920
184.320
181.023
180.708
178.425
177.012
M185x6
6
4g6g
184.920
184.320
181.023
180.823
178.425
177.127
M185x4
4
6g
184.940
184.465
182.342
182.062
180.610
179.598
M185x4
4
4g6g
184.940
184.465
182.342
182.162
180.610
179.698
M185x3
3
6g
184.952
184.577
183.003
182.753
181.704
180.905
M185x3
3
4g6g
184.952
184.577
183.003
182.843
181.704
180.995
M185x2
2
6g
184.962
184.682
183.663
183.451
182.797
182.219
M185x2
2
4g6g
184.962
184.682
183.663
183.531
182.797
182.299
M190x8
8
6g
189.900
189.190
184.704
184.349
181.240
179.421
M190x8
8
4g6g
189.900
189.190
184.704
184.480
181.240
179.552
M190x6
6
6g
189.920
189.320
186.023
185.708
183.425
182.012
M190x6
6
4g6g
189.920
189.320
186.023
185.823
183.425
182.127
M190x4
4
6g
189.940
189.465
187.342
187.062
185.610
184.598
M190x4
4
4g6g
189.940
189.465
187.342
187.162
185.610
184.698
M190x3
3
6g
189.952
189.577
188.003
187.753
186.704
185.905
M190x3
3
4g6g
189.952
189.577
188.003
187.843
186.704
185.995
M190x2
2
6g
189.962
189.682
188.663
188.451
187.797
187.219
M190x2
2
4g6g
189.962
189.682
188.663
188.531
187.797
187.299
M195x6
6
6g
194.920
194.320
191.023
190.708
188.425
187.012
M195x6
6
4g6g
194.920
194.320
191.023
190.823
188.425
187.127
M195x4
4
6g
194.940
194.465
192.342
192.062
190.610
189.598
M195x4
4
4g6g
194.940
194.465
192.342
192.162
190.610
189.698
M195x3
3
6g
194.952
194.577
193.003
192.753
191.704
190.905
M195x3
3
4g6g
194.952
194.577
193.003
192.843
191.704
190.995
M195x2
2
6g
194.962
194.682
193.663
193.451
192.797
192.219
M195x2
2
4g6g
194.962
194.682
193.663
193.531
192.797
192.299
M200x8
8
6g
199.900
199.190
194.704
194.349
191.240
189.421
M200x8
8
4g6g
199.900
199.190
194.704
194.480
191.240
189.552
M200x6
6
6g
199.920
199.320
196.023
195.708
193.425
192.012
M200x6
6
4g6g
199.920
199.320
196.023
195.823
193.425
192.127
M200x4
4
6g
199.940
199.465
197.342
197.062
195.610
194.598
M200x4
4
4g6g
199.940
199.465
197.342
197.162
195.610
194.698
M200x3
3
6g
199.952
199.577
198.003
197.753
196.704
195.905
M200x3
3
4g6g
199.952
199.577
198.003
197.843
196.704
195.995
M200x2
2
6g
199.962
199.682
198.663
198.451
197.797
197.219
M200x2
2
4g6g
199.962
199.682
198.663
198.531
197.797
197.299
M205x6
6
6g
204.920
204.320
201.023
200.708
198.425
197.012
M205x6
6
4g6g
204.920
204.320
201.023
200.823
198.425
197.127
M205x4
4
6g
204.940
204.465
202.342
202.062
200.610
199.598
M205x4
4
4g6g
204.940
204.465
202.342
202.162
200.610
199.698
M205x3
3
6g
204.952
204.577
203.003
202.753
201.704
200.905
M205x3
3
4g6g
204.952
204.577
203.003
202.843
201.704
200.995
M205x2
2
6g
204.962
204.682
203.663
203.451
202.797
202.219
M205x2
2
4g6g
204.962
204.682
203.663
203.531
202.797
202.299
M210x8
8
6g
209.900
209.190
204.704
204.349
201.240
199.421
M210x8
8
4g6g
209.900
209.190
204.704
204.480
201.240
199.552
M210x6
6
6g
209.920
209.320
206.023
205.708
203.425
202.012
M210x6
6
4g6g
209.920
209.320
206.023
205.823
203.425
202.127
M210x4
4
6g
209.940
209.465
207.342
207.062
205.610
204.598
M210x4
4
4g6g
209.940
209.465
207.342
207.162
205.610
204.698
M210x3
3
6g
209.952
209.577
208.003
207.753
206.704
205.905
M210x3
3
4g6g
209.952
209.577
208.003
207.843
206.704
205.995
M210x2
2
6g
209.962
209.682
208.663
208.451
207.797
207.219
M210x2
2
4g6g
209.962
209.682
208.663
208.531
207.797
207.299
M215x6
6
6g
214.920
214.320
211.023
210.708
208.425
207.012
M215x6
6
4g6g
214.920
214.320
211.023
210.823
208.425
207.127
M215x4
4
6g
214.940
214.465
212.342
212.062
210.610
209.598
M215x4
4
4g6g
214.940
214.465
212.342
212.162
210.610
209.698
M215x3
3
6g
214.952
214.577
213.003
212.753
211.704
210.905
M215x3
3
4g6g
214.952
214.577
213.003
212.843
211.704
210.995
M220x8
8
6g
219.900
219.190
214.704
214.349
211.240
209.421
M220x8
8
4g6g
219.900
219.190
214.704
214.480
211.240
209.552
M220x6
6
6g
219.920
219.320
216.023
215.708
213.425
212.012
M220x6
6
4g6g
219.920
219.320
216.023
215.823
213.425
212.127
M220x4
4
6g
219.940
219.465
217.342
217.062
215.610
214.598
M220x4
4
4g6g
219.940
219.465
217.342
217.162
215.610
214.698
M220x3
3
6g
219.952
219.577
218.003
217.753
216.704
215.905
M220x3
3
4g6g
219.952
219.577
218.003
217.843
216.704
215.995
M220x2
2
6g
219.962
219.682
218.663
218.451
217.797
217.219
M220x2
2
4g6g
219.962
219.682
218.663
218.531
217.797
217.299
M225x6
6
6g
224.920
224.545
221.023
220.708
218.425
217.012
M225x6
6
4g6g
224.920
224.545
221.023
220.823
218.425
217.127
M225x4
4
6g
224.940
224.465
222.342
222.062
220.610
219.598
M225x4
4
4g6g
224.940
224.465
222.342
222.162
220.610
219.698
M225x3
3
6g
224.952
224.577
223.003
222.753
221.704
220.905
M225x3
3
4g6g
224.952
224.577
223.003
222.843
221.704
220.995
M225x2
2
6g
224.962
224.682
223.663
223.451
222.797
222.219
M225x2
2
4g6g
224.962
224.682
223.663
223.531
222.797
222.299
M230x6
6
6g
229.920
229.320
226.023
225.708
223.425
222.012
M230x6
6
4g6g
229.920
229.320
226.023
225.823
223.425
222.127
M230x4
4
6g
229.940
229.465
227.342
227.062
225.610
224.598
M230x4
4
4g6g
229.940
229.465
227.342
227.162
225.610
224.698
M230x3
3
6g
229.952
229.577
228.003
227.753
226.704
225.905
M230x3
3
4g6g
229.952
229.577
228.003
227.843
226.704
225.995
M230x2
2
6g
229.962
229.682
228.663
228.451
227.797
227.219
M230x2
2
4g6g
229.962
229.682
228.663
228.531
227.797
227.299
M235x6
6
6g
234.920
234.320
231.023
230.668
228.425
226.972
M235x6
6
4g6g
234.920
234.320
231.023
230.799
228.425
227.103
M235x4
4
6g
234.940
234.465
232.342
232.062
230.610
229.598
M235x4
4
4g6g
234.940
234.465
232.342
232.162
230.610
229.698
M235x3
3
6g
234.952
234.577
233.003
232.753
231.704
230.905
M235x3
3
4g6g
234.952
234.577
233.003
232.843
231.704
230.995
M240x8
8
6g
239.900
239.190
234.704
234.349
231.240
229.421
M240x8
8
4g6g
239.900
239.190
234.704
234.480
231.240
229.552
M240x6
6
6g
239.920
239.320
236.023
235.708
233.425
232.012
M240x6
6
4g6g
239.920
239.320
236.023
235.823
233.425
232.127
M240x4
4
6g
239.940
239.465
237.342
237.062
235.610
234.598
M240x4
4
4g6g
239.940
239.465
237.342
237.162
235.610
234.698
M240x3
3
6g
239.952
239.577
238.003
237.753
236.704
235.905
M240x3
3
4g6g
239.952
239.577
238.003
237.843
236.704
235.995
M240x2
2
6g
239.962
239.682
238.663
238.451
237.797
237.219
M240x2
2
4g6g
239.962
239.682
238.663
238.531
237.797
237.299
M245x6
6
6g
244.920
244.320
241.023
240.708
238.425
237.012
M245x6
6
4g6g
244.920
244.320
241.023
240.823
238.425
237.127
M245x4
4
6g
244.940
244.465
242.342
242.062
240.610
239.598
M245x4
4
4g6g
244.940
244.465
242.342
242.162
240.610
239.698
M245x3
3
6g
244.952
244.577
243.003
242.753
241.704
240.905
M245x3
3
4g6g
244.952
244.577
243.003
242.843
241.704
240.995
M245x2
2
6g
244.962
244.682
243.663
243.451
242.797
242.219
M245x2
2
4g6g
244.962
244.682
243.663
243.531
242.797
242.299
M250x8
8
6g
249.900
249.190
244.704
244.349
241.240
239.421
M250x8
8
4g6g
249.900
249.190
244.704
244.480
241.240
239.552
M250x6
6
6g
249.920
249.320
246.023
245.708
243.425
242.012
M250x6
6
4g6g
249.920
249.320
246.023
245.823
243.425
242.127
M250x4
4
6g
249.940
249.465
247.342
247.062
245.610
244.598
M250x4
4
4g6g
249.940
249.465
247.342
247.162
245.610
244.698
M250x3
3
6g
249.952
249.577
248.003
247.753
246.704
245.905
M250x3
3
4g6g
249.952
249.577
248.003
247.843
246.704
245.995
M250x2
2
6g
249.962
249.682
248.663
248.451
247.797
247.219
M250x2
2
4g6g
249.962
249.682
248.663
248.531
247.797
247.299
M255x6
6
6g
254.920
254.320
251.023
250.668
248.425
246.972
M255x6
6
4g6g
254.920
254.320
251.023
250.799
248.425
247.103
M255x4
4
6g
254.940
254.465
252.342
252.062
250.610
249.598
M255x4
4
4g6g
254.940
254.465
252.342
252.162
250.610
249.698
M255x3
3
6g
254.952
254.577
253.003
252.753
251.704
250.905
M255x3
3
4g6g
254.952
254.577
253.003
252.843
251.704
250.995

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