Technical Info Machining tolerance・Inner diameter size >>>Tokai Bussan Co., Ltd. / Tokai Metal Industry Co.,Ltd.

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Machining Tolerance・Inner diameter size

1.Tolerance of machining measurement

Without customer’s request, tolerance is made along JIS: middle grade (the 2nd grade.)
Details are below.


①Tolerance to the measurement except beveling part.(mm)

Grade
Standard measurement categories
0.5≦
≦3.0
3.0<
≦6.0
6.0<
≦30.0
30.0<
≦120.0
120.0<
≦400
400<
≦1000
1000<
≦2000
Precise
±0.05
±0.05
±0.1
±0.15
±0.2
±0.3
±0.5
Middle
±0.1
±0.1
±0.2
±0.3
±0.5
±0.8
±1.2
Coarse
±0.2
±0.3
±0.5
±0.8
±1.2
±2
±3
Very coarse
±0.5
±1
±1.5
±2.5
±4
±6


②Tolerance to the measurement of beveling part (mm)

Grade
Standard measurement categories
0.5≦
≦3.0
3.0<
≦6.0
6.0<
Precise
±0.2
±0.5
±1
Middle
Coarse
±0.4
±1
±2
Very coarse

③Tolerance of the angle measurement (mm)

Grade
Standard measurement categories
0.5≤
≤3.0
3.0<
≤6.0
6.0<
≤30.0
30.0<
≤120.0
120.0<
≤400
Precise
±1°
±30'
±20'
±10'
±5'
Middle
Coarse
±1°30'
±1°
±30'
±15'
±10'
Very coarse
±3°
±2°
±1°
±30'
±20'

2.Resin Hole Inner Diameter Measurement

内径

Without customer’s request, tolerance is made along JIS: middle grade (the 2nd grade.)

If the customer dose use the molding insert nut and dose not request inner-diameter, molding pin measurement is refered to "min" on the below table.

Metric parallel-knurling thread

Thread Size
2nd grade female-thread inner-diameter
max
min
M1×0.25
0.785
0.729
M1.1×0.25
0.885
0.829
M1.2×0.25
0.985
0.929
M1.4×0.3
1.142
1.075
M1.6×0.35
1.321
1.221
M1.7×0.35
1.421
1.321
M1.8×0.35
1.521
1.421
M2.0×0.4
1.679
1.567
M2.2×0.45
1.839
1.713
M2.3×0.4
1.979
1.867
M2.5×0.45
2.138
2.013
M2.6×0.45
2.238
2.113
M3×0.5
2.599
2.459
※M3×0.6
2.440
2.280
M3.5×0.6
3.010
2.850
M4×0.7
3.422
3.242
※M4×0.75
3.326
3.106
M4.5×0.75
3.878
3.688
M5×0.8
4.334
4.134
※M5×0.9
4.170
3.930
M6×1.0
5.153
4.917
M7×1.0
6.153
5.917
M8×1.25
6.912
6.647
M9×1.25
7.912
7.647
M10×1.5
8.676
8.376
M11×1.5
9.676
9.376
M12×1.75
10.441
10.106
M14×2.0
12.210
11.835
M16×2.0
14.210
13.835
M18×2.5
15.744
15.294
M20×2.5
17.744
17.294

 

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