Internal Metric Thread and Fastener Sizes M 25 - M 50

Internal Metric Thread Table Chart Fastener Sizes M25 - M50

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

The following table chart are standard metric internal thread sizes M 25 - M 50 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 external thread design. All units in mm.

Metric Internal and External threads

Where:

H = P ( 3^1/2 / 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
		Tolerance Class	Min	Max	Min	Max	Min	Max	Basic
M25x2	2	6H	22.835	23.210	23.701	23.925	25.000	25.513	23.000
M25x1.5	1.5	6H	23.376	23.676	24.026	24.226	25.000	25.416	23.500
M25x1	1	6H	23.917	24.153	24.350	24.520	25.000	25.314	24.000
M26x1.5	1.5	6H	24.376	24.676	25.026	25.226	26.000	26.417	24.500
M27x3	3	6H	23.752	24.252	25.051	25.316	27.000	27.698	24.000
M27x2	2	6H	24.835	25.210	25.701	25.925	27.000	27.513	25.000
M27x1.5	1.5	6H	25.376	25.676	26.026	26.226	27.000	27.417	25.500
M27x1	1	6H	25.917	26.153	26.350	26.520	27.000	27.314	26.000
M27x0.75	0.75	6H	26.188	26.378	26.513	26.663	27.000	27.258	26.250
M28x2	2	6H	25.835	26.210	26.701	26.925	28.000	28.513	26.000
M28x1.5	1.5	6H	26.376	26.676	27.026	27.226	28.000	28.417	26.500
M28x1	1	6H	26.917	27.153	27.350	27.520	28.000	28.314	27.000
M30x3.5	3.5	6H	26.211	26.771	27.727	28.007	30.000	30.785	26.500
M30x3	3	6H	26.752	27.252	28.051	28.316	30.000	30.698	27.000
M30x2.5	2.5	6H	27.294	27.744	28.376	28.626	30.000	30.611	27.500
M30x2	2	6H	27.835	28.210	28.701	28.925	30.000	30.513	28.000
M30x1.5	1.5	6H	28.376	28.676	29.026	29.226	30.000	30.416	28.500
M30x1	1	6H	28.917	29.153	29.350	29.520	30.000	30.314	29.000
M30x0.75	0.75	6H	29.188	29.378	29.513	29.663	30.000	30.258	29.250
M32x2	2	6H	29.835	30.210	30.701	30.925	32.000	32.513	30.000
M32x1.5	1.5	6H	30.376	30.676	31.026	31.226	32.000	32.417	30.500
M33x3.5	3.5	6H	29.211	29.771	30.727	31.007	33.000	33.785	29.500
M33x3	3	6H	29.752	30.252	31.051	31.316	33.000	33.698	30.000
M33x2	2	6H	30.835	31.210	31.701	31.925	33.000	33.513	31.000
M33x1.5	1.5	6H	31.376	31.676	32.026	32.226	33.000	33.417	31.500
M33x1	1	6H	31.917	32.153	32.350	32.520	33.000	33.314	32.000
M33x0.75	0.75	6H	32.188	32.378	32.513	32.663	33.000	33.258	31.250
M35x1.5	1.5	6H	33.376	33.676	34.026	34.226	35.000	35.416	33.500
M36x4	4	6H	31.670	32.270	33.402	33.702	36.000	36.877	32.000
M36x3	3	6H	32.752	33.252	34.051	34.316	36.000	36.698	33.000
M36x2	2	6H	33.835	34.210	34.701	34.925	36.000	36.513	34.000
M36x1.5	1.5	6H	34.376	34.676	35.026	35.226	36.000	36.417	34.500
M36x1	1	6H	34.917	35.153	35.350	35.520	36.000	36.314	35.000
M38x1.5	1.5	6H	36.376	36.676	37.026	37.226	38.000	38.417	36.500
M39x4	4	6H	34.670	35.270	36.402	36.702	39.000	39.877	35.000
M39x3	3	6H	35.752	36.252	37.051	37.316	39.000	39.698	36.000
M39x2	2	6H	36.835	37.210	37.701	37.925	39.000	39.513	37.000
M39x1.5	1.5	6H	37.376	37.676	38.026	38.226	39.000	39.417	37.500
M39x1	1	6H	37.917	38.153	38.350	38.520	39.000	39.314	38.000
M40x3	3	6H	36.752	37.252	38.051	38.316	40.000	40.698	37.000
M40x2.5	2.5	6H	37.294	37.744	38.376	38.626	40.000	40.611	37.500
M40x2	2	6H	37.835	38.210	38.701	38.925	40.000	40.513	38.000
M40x1.5	1.5	6H	38.376	38.676	39.026	39.226	40.000	40.416	38.500
M42x4.5	4.5	6H	37.129	37.799	39.077	39.392	42.000	42.965	37.500
M42x4	4	6H	37.670	38.270	39.402	39.702	42.000	42.877	38.000
M42x3	3	6H	38.752	39.252	40.051	40.316	42.000	42.698	39.000
M42x2	2	6H	39.835	40.210	40.701	40.925	42.000	42.513	40.000
M42x1.5	1.5	6H	40.376	40.676	41.026	41.226	42.000	42.417	40.500
M42x1	1	6H	40.917	41.153	41.350	41.520	42.000	42.314	41.000
M45x4.5	4.5	6H	40.129	40.799	42.077	42.392	45.000	45.965	41.500
M45x4	4	6H	40.670	41.270	42.402	42.702	45.000	45.877	41.000
M45x3	3	6H	41.752	42.252	43.051	43.316	45.000	45.698	42.000
M45x2	2	6H	42.835	43.210	43.701	43.925	45.000	45.513	43.000
M45x1.5	1.5	6H	43.376	43.676	44.026	44.226	45.000	45.416	43.500
M45x1	1	6H	43.917	44.153	44.350	44.520	45.000	45.314	44.000
M48x5	5	6H	42.587	43.297	44.752	45.087	48.000	49.057	43.000
M48x4	4	6H	43.670	44.270	45.402	45.717	48.000	48.892	44.000
M48x3	3	6H	44.752	45.252	46.051	46.331	48.000	48.713	45.000
M48x2	2	6H	45.835	46.210	46.701	46.937	48.000	48.525	46.000
M48x1.5	1.5	6H	46.376	46.676	47.026	47.238	48.000	48.429	46.500
M50x4	4	6H	45.670	46.270	47.402	47.717	50.000	50.892	46.000
M50x3	3	6H	46.752	47.252	48.051	48.331	50.000	50.713	47.000
M50x2	2	6H	47.835	48.210	48.701	48.937	50.000	50.525	48.000
M50x1.5	1.5	6H	48.376	48.676	49.026	49.238	50.000	50.428	48.500