Internal Metric Thread Table Chart Fastener Sizes M125 - M180

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

The following table chart are standard metric internal thread sizes M125 - M180 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
M125x8
8
6H
116.340
117.340
119.804
120.254
125.000
126.605
117.000
M125x6
6
6H
118.505
119.305
121.103
121.503
125.000
126.266
119.000
M125x4
4
6H
120.670
121.270
122.402
122.737
125.000
125.912
121.000
M125x3
3
6H
121.752
122.252
123.051
123.351
125.000
125.733
122.000
M125x2
2
6H
122.835
123.210
123.701
123.951
125.000
125.539
123.000
M125x1.5
1.5
6H
123.376
123.676
124.026
124.262
125.000
125.453
123.500
M130x8
8
6H
121.340
122.340
124.804
125.254
130.000
131.605
122.000
M130x6
6
6H
123.505
124.305
126.103
126.503
130.000
131.266
124.000
M130x4
4
6H
125.670
126.270
127.402
127.737
130.000
130.912
126.000
M130x3
3
6H
126.752
127.252
128.051
128.351
130.000
130.733
127.000
M130x2
2
6H
127.835
128.210
128.701
128.951
130.000
130.539
128.000
M130x1.5
1.5
6H
128.376
128.676
129.026
129.262
130.000
130.453
128.500
M135x6
6
6H
128.505
129.305
131.103
131.503
135.000
136.266
129.000
M135x4
4
6H
130.670
131.270
132.402
132.737
135.000
135.912
131.000
M135x3
3
6H
131.752
132.252
133.051
133.351
135.000
135.733
132.000
M135x2
2
6H
132.835
133.210
133.701
133.951
135.000
135.539
133.000
M135x1.5
1.5
6H
133.376
133.676
134.026
134.262
135.000
135.453
133.500
M140x8
8
6H
131.340
132.340
134.804
135.254
140.000
141.605
132.000
M140x6
6
6H
133.505
134.305
136.103
136.503
140.000
141.266
134.000
M140x4
4
6H
135.670
136.270
137.402
137.737
140.000
140.912
136.000
M140x3
3
6H
136.752
137.252
138.051
138.351
140.000
140.733
137.000
M140x2
2
6H
137.835
138.210
138.701
138.951
140.000
140.539
138.000
M140x1.5
1.5
6H
138.376
138.676
139.026
139.262
140.000
140.453
138.500
M145x6
6
6H
138.505
139.305
141.103
141.503
145.000
146.266
139.000
M145x4
4
6H
140.670
141.270
142.402
142.737
145.000
145.912
141.000
M145x3
3
6H
141.752
142.252
143.051
143.351
145.000
145.733
142.000
M145x2
2
6H
142.835
143.210
143.701
143.951
145.000
145.539
143.000
M145x1.5
1.5
6H
143.376
143.676
144.026
144.262
145.000
145.453
143.500
M150x8
8
6H
141.340
142.340
144.804
145.254
150.000
151.605
142.000
M150x6
6
6H
143.505
144.305
146.103
146.503
150.000
151.266
144.000
M150x4
4
6H
145.670
146.270
147.402
147.737
150.000
150.912
146.000
M150x3
3
6H
146.752
147.252
148.051
148.351
150.000
150.733
147.000
M150x2
2
6H
147.835
148.210
148.701
148.951
150.000
150.539
148.000
M150x1.5
1.5
6H
148.376
148.676
149.026
149.262
150.000
150.453
148.500
M155x6
6
6H
148.505
149.305
151.103
151.503
155.000
156.266
149.000
M155x4
4
6H
150.670
151.270
152.402
152.737
155.000
155.912
151.000
M155x3
3
6H
151.752
152.252
153.051
153.351
155.000
155.733
152.000
M155x2
2
6H
152.835
153.210
153.701
153.951
155.000
155.539
153.000
M160x8
8
6H
151.340
152.340
154.804
155.254
160.000
161.605
152.000
M160x6
6
6H
153.505
154.305
156.103
156.503
160.000
161.266
154.000
M160x4
4
6H
155.670
156.270
157.402
157.737
160.000
160.912
156.000
M160x3
3
6H
156.752
157.252
158.051
158.351
160.000
160.733
157.000
M160x2
2
6H
157.835
158.210
158.701
158.951
160.000
160.539
158.000
M165x6
6
6H
158.505
159.305
161.103
161.503
165.000
166.266
159.000
M165x4
4
6H
160.670
161.270
162.402
162.737
165.000
165.912
161.000
M165x3
3
6H
161.752
162.252
163.051
163.351
165.000
165.733
162.000
M165x2
2
6H
162.835
163.210
163.701
163.951
165.000
165.539
163.000
M170x8
8
6H
161.340
162.340
164.804
165.254
170.000
171.605
162.000
M170x6
6
6H
163.505
164.305
166.103
166.503
170.000
171.266
164.000
M170x4
4
6H
165.670
166.270
167.402
167.737
170.000
170.912
166.000
M170x3
3
6H
166.752
167.252
168.051
168.351
170.000
170.733
167.000
M170x2
2
6H
167.835
168.210
168.701
168.951
170.000
170.539
168.000
M175x6
6
6H
168.505
169.305
171.103
171.503
175.000
176.266
169.000
M175x4
4
6H
170.670
171.270
172.402
172.737
175.000
175.912
171.000
M175x3
3
6H
171.752
172.252
173.051
173.351
175.000
175.733
172.000
M175x2
2
6H
172.835
173.210
173.701
173.951
175.000
175.539
173.000
M180x8
8
6H
171.340
172.340
174.804
175.254
180.000
181.605
172.000
M180x6
6
6H
173.505
174.305
176.103
176.503
180.000
181.266
174.000
M180x4
4
6H
175.670
176.270
177.402
177.737
180.000
180.912
176.000
M180x3
3
6H
176.752
177.252
178.051
178.351
180.000
180.733
17.000
M180x2
2
6H
177.835
178.210
178.701
178.951
180.000
180.539
178.000

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