Internal Metric Thread Table Chart Fastener Sizes M185 - M230

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

The following table chart are standard metric internal thread sizes M185 - M230 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
M185x6
6
6H
178.505
179.305
181.103
181.528
185.000
186.291
179.000
M185x4
4
6H
180.670
181.270
182.402
182.777
185.000
185.952
181.000
M185x3
3
6H
181.752
182.252
183.051
183.386
185.000
185.768
182.000
M185x2
2
6H
182.835
183.210
183.701
183.981
185.000
185.569
183.000
M190x8
8
6H
181.340
182.340
184.804
185.279
190.000
191.630
182.000
M190x6
6
6H
183.505
184.305
186.103
186.528
190.000
191.291
184.000
M190x4
4
6H
185.670
186.270
187.402
187.777
190.000
190.952
186.000
M190x3
3
6H
186.752
187.252
188.051
188.386
190.000
190.768
187.000
M190x2
2
6H
187.835
188.210
188.701
188.981
190.000
190.569
188.000
M195x6
6
6H
188.505
189.305
191.103
191.528
195.000
196.291
189.000
M195x4
4
6H
190.670
191.270
192.402
192.777
195.000
195.952
191.000
M195x3
3
6H
191.752
192.252
193.051
193.386
195.000
195.768
192.000
M195x2
2
6H
192.835
193.210
193.701
193.981
195.000
195.569
193.000
M200x8
8
6H
191.340
192.340
194.804
195.279
200.000
201.630
192.000
M200x6
6
6H
193.505
194.305
196.103
196.528
200.000
201.291
194.000
M200x4
4
6H
195.670
196.270
197.402
197.777
200.000
200.952
196.000
M200x3
3
6H
196.752
197.252
198.051
198.386
200.000
200.768
197.000
M200x2
2
6H
197.835
198.210
198.701
198.981
200.000
200.569
198.000
M205x6
6
6H
198.505
199.305
201.103
201.528
205.000
206.291
199.000
M205x4
4
6H
200.670
201.270
202.402
202.777
205.000
205.952
201.000
M205x3
3
6H
201.752
202.252
203.051
203.386
205.000
205.768
202.000
M205x2
2
6H
202.835
203.210
203.701
203.981
205.000
205.569
203.000
M210x8
8
6H
201.340
202.340
204.804
205.279
210.000
211.630
202.000
M210x6
6
6H
203.505
204.305
206.103
206.528
210.000
211.291
204.000
M210x4
4
6H
205.670
206.270
207.402
207.777
210.000
210.952
206.000
M210x3
3
6H
206.752
207.252
208.051
208.386
210.000
210.768
207.000
M210x2
2
6H
207.835
208.210
208.701
208.981
210.000
210.569
208.000
M215x6
6
6H
208.505
209.305
211.103
211.528
215.000
216.291
209.000
M215x4
4
6H
210.670
211.270
212.402
212.777
215.000
215.952
211.000
M215x3
3
6H
211.752
212.252
213.051
213.386
215.000
215.768
212.000
M220x8
8
6H
211.340
212.340
214.804
215.279
220.000
221.630
212.000
M220x6
6
6H
213.505
214.305
216.103
216.528
220.000
221.291
214.000
M220x4
4
6H
215.670
216.270
217.402
217.777
220.000
220.952
216.000
M220x3
3
6H
216.752
217.252
218.051
218.386
220.000
220.768
217.000
M220x2
2
6H
217.835
218.210
218.701
218.981
220.000
220.569
218.000
M225x6
6
6H
218.505
219.305
221.103
221.528
225.000
226.291
219.000
M225x4
4
6H
220.670
221.270
222.402
222.777
225.000
225.952
221.000
M225x3
3
6H
221.752
222.252
223.051
223.386
225.000
225.768
222.000
M225x2
2
6H
222.835
223.210
223.701
223.981
225.000
225.569
223.000
M230x6
6
6H
223.505
224.305
226.103
226.528
230.000
231.291
224.000
M230x4
4
6H
225.670
226.270
227.402
227.777
230.000
230.952
226.000
M230x3
3
6H
226.752
227.252
228.051
228.386
230.000
230.768
227.000
M230x2
2
6H
227.835
228.210
228.701
228.981
230.000
230.569
228.000

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