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Standard Dimensional Specifications & Tolerances
| Outer Diameter (mm) |
Inner Diameter (mm) |
Height (mm) |
OD Tolerance (mm) |
ID Tolerance (mm) |
Height Tolerance (mm) |
|---|---|---|---|---|---|
| 20 | 10 | 5～20 | ±0.2 | ±0.2 | ±0.2 |
| 30 | 15 / 20 | 5～30 | ±0.2 | ±0.2 | ±0.2 |
| 40 | 20 / 30 | 5～30 | ±0.2 | ±0.2 | ±0.2 |
| 50 | 30 / 40 | 5～50 | ±0.3 | ±0.3 | ±0.3 |
| 60 | 40 / 50 | 5～50 | ±0.3 | ±0.3 | ±0.3 |
| 80 | 50 / 60 / 70 | 10～60 | ±0.3 | ±0.3 | ±0.3 |
| 100 | 60 / 80 / 90 | 10～80 | ±0.5 | ±0.5 | ±0.5 |
| 120 | 80 / 100 | 10～80 | ±0.5 | ±0.5 | ±0.5 |
| 150 | 100 / 120 | 10～100 | ±0.8 | ±0.8 | ±0.5 |
| 200 | 150 / 180 | 10～120 | ±1.0 | ±1.0 | ±0.8 |
| 250 | 200 / 220 | 10～120 | ±1.2 | ±1.2 | ±0.8 |
| 300 | 250 / 280 | 10～150 | ±1.5 | ±1.5 | ±1.0 |
Frequently Asked Questions
Q
What do the outer diameter, inner diameter, and height specifications refer to in this table?
A
These specifications define the standard dimensional parameters of the components. The outer diameter (OD) is the total external width, the inner diameter (ID) is the bore or hole size, and the height refers to the axial length of the part. All values are measured in millimeters (mm).
Q
Why does one outer diameter size have multiple inner diameter options?
A
Multiple inner diameter options for a given outer diameter allow greater flexibility in design and application. For example, an OD of 80mm can be paired with inner diameters of 50mm, 60mm, or 70mm, enabling customers to select the wall thickness that best suits their specific requirements.
Q
Why do tolerance values increase as the outer diameter gets larger?
A
Larger components inherently involve greater material volume and more complex manufacturing processes, making it more challenging to achieve the same tight tolerances as smaller parts. The tolerances in this table are set according to industry standards, balancing precision with practical manufacturability across different size ranges.
Q
Can I order custom dimensions that are not listed in this specification table?
A
Yes. The table represents standard available sizes. Custom outer diameters, inner diameters, heights, and tolerances may be accommodated based on your specific application needs. Please contact our technical team with your requirements for a customized solution and quotation.
Q
What does the height range (e.g., 5～20) indicate, and can I specify an exact height within that range?
A
The height range indicates the minimum and maximum heights available for that particular outer diameter. You can specify any height value within the listed range. The height tolerance (e.g., ±0.2mm) will apply to your chosen dimension, ensuring consistent and accurate production.
Q
Are the tolerance values symmetrical, and what does ± mean in this context?
A
Yes, the ± symbol indicates that the actual dimension may deviate from the nominal value by up to the stated amount in either direction — either larger or smaller. For example, a ±0.2mm tolerance on an OD of 20mm means the acceptable range is 19.8mm to 20.2mm. This ensures parts remain within functional fit requirements.