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Contact person: Nick Lee
Phone: (86) 15362887736
E-mail: sales03@dgmtwj.cn
Tel: (86) 769-88388276
Factory: No.2, Baidai Industrial Park, Daojiao Town, Dongguan, China ，
Free tolerance table
1. Limit deviation value of linear dimension (GB / t1804-2000) (mm)
|
Tolerance class |
Basic dimension segmentation |
||||||
|
|
0.5~3 |
＞3~6 |
＞6~30 |
＞30~120 |
＞120~400 |
＞400~1000 |
＞1000~2000 |
|
precise f |
±0.05 |
±0.05 |
±0.1 |
±0.15 |
±0.2 |
±0.3 |
±0.5 |
|
Middle m |
±0.1 |
±0.1 |
±0.2 |
±0.3 |
±0.5 |
±0.8 |
±1.2 |
|
Rough e |
±0.2 |
±0.3 |
±0.5 |
±0.8 |
±1.2 |
±2 |
±3 |
|
Coarsest v |
-- |
±0.5 |
±1 |
±1.5 |
±2.5 |
±4 |
±6 |
2. Limit deviation of rounding radius and chamfering height (GB / t1804-2000) mm
|
Tolerance class |
Basic dimension segmentation |
|||
|
|
0.5~3 |
＞3~6 |
＞6~30 |
＞30 |
|
precise f |
±0.2 |
±0.5 |
±1 |
±2 |
|
Middle m |
||||
|
Rough e |
±0.4 |
±1 |
±2 |
±4 |
|
Coarsest v |
||||
3. Limit deviation value of angle dimension (GB / t1804-2000)
|
Tolerance class |
Basic dimension segmentation |
||||
|
|
~10 |
＞10~50 |
＞50~120 |
＞120~400 |
＞400 |
|
precise f |
±1° |
±30′ |
±20′ |
±10′ |
±5′ |
|
Middle m |
|||||
|
Rough e |
±1°30′ |
±1° |
±30′ |
±20′ |
±10′ |
|
Coarsest v |
±3° |
±2° |
±1° |
±30′ |
±20′ |
4. The form and position tolerance without indication shall be in accordance with GB / t1184-k
4.1 tolerance values of straightness and flatness (GB / t1184-1996) (mm)
|
Tolerance class |
Basic dimension segmentation |
|||||
|
|
≤10 |
＞10~30 |
＞30~100 |
＞100~300 |
＞300~1000 |
＞1000~3000 |
|
H |
0.03 |
0.05 |
0.1 |
0.2 |
0.3 |
0.4 |
|
K |
0.05 |
0.1 |
0.2 |
0.4 |
0.6 |
0.8 |
|
L |
0.1 |
0.2 |
0.4 |
0.8 |
1.2 |
1.6 |
4.2 undeclared tolerance value of verticality (GB / t1184-1996) (mm)
|
Tolerance class |
Basic dimension segmentation |
|||
|
|
≤100 |
＞100~300 |
＞300~1000 |
＞1000~3000 |
|
H |
0.2 |
0.3 |
0.4 |
0.5 |
|
K |
0.4 |
0.6 |
0.8 |
1 |
|
L |
0.4 |
1 |
1.5 |
2 |
4.3 tolerance value of symmetry without indication (GB / t1184-1996) (mm)
|
Tolerance class |
Basic dimension segmentation |
|||
|
|
≤100 |
＞100~300 |
＞300~1000 |
＞1000~3000 |
|
H |
0.5 |
|
|
|
|
K |
0.6 |
0.8 |
1 |
|
|
L |
0.6 |
1 |
1.5 |
2 |
4.4 undeclared tolerance value of circular runout (GB / t1184-1996) (mm)
|
Tolerance class |
Basic dimension segmentation |
|
H |
0.1 |
|
K |
0.2 |
|
L |
0.3 |
3. surface roughness
The surface of the part shall be marked with the grade of roughness. If more surfaces have the same surface roughness level, they shall be marked in the upper right corner of the drawing and the words "rest" shall be added.
The selection of roughness grade can be determined according to the working requirements and Dimension Accuracy grades of each surface. Under the condition of meeting the working requirements, the grade shall not be increased arbitrarily.
1) Selection value of sampling length and evaluation length (gb/t1031-1995)
|
Ra (μm) |
Rz (μm) |
Sampling length l(mm) |
Evaluation length l n(mm) |
|
＞0.003~0.02 |
＞0.025~0.10 |
0.08 |
0.4 |
|
＞0.02~0.10 |
＞0.1~0.50 |
0.25 |
1.25 |
|
＞0.1~2.0 |
＞0.50~10.0 |
0.8 |
4.0 |
|
＞2.0~10.0 |
＞10.0~50 |
2.5 |
12.5 |
|
＞10.0~80 |
＞50~320 |
8.0 |
40.0 |
2) Value of arithmetic mean deviation Ra of contour (GB / t1031-1995)（ μ m）
Series 1: 0.012, 0.025, 0.050, 0.10, 0.20, 0.40, 0.80, 1.60, 3.2, 6.3, 12.5, 25, 50, 100
Series 2 0.008, 0.010, 0.016, 0.020, 0.032, 0.040, 0.063, 0.080, 0.125, 0.160, 0.25, 0.32, 0.50, 0.63, 1.0, 1.25, 2.0, 2.5, 4.0, 5.0, 8.0, 10.0, 16.0, 20, 32, 40, 63, 80
Note: try to choose the first series
3) Value of maximum height RZ of contour (GB / t1031-1995)（ μ m）
Series 1: 0.025, 0.050, 0.100, 0.20, 0.40, 0.80, 1.60, 3.2, 6.3, 12.5, 25, 50, 100, 200, 400, 800, 1600,
Series 2 0.032, 0.040, 0.063, 0.080, 0.125, 0.160, 0.25, 0.32, 0.50, 0.63, 1.0, 1.25, 2.0, 2.5, 4.0, 5.0, 8.0, 10.0, 16.0, 20, 32, 40, 63, 80125160250320500630
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