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All dimensions are in millimeters (mm). Tolerances apply to standard production conditions. Custom sizes and tolerances are available upon request.
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Standard Dimensional Specifications & Tolerances
| Outer Diameter | Inner Diameter | Height | Outer Diameter Tolerance | Inner Diameter Tolerance | Height Tolerance |
|---|---|---|---|---|---|
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 |
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Frequently Asked Questions
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What unit of measurement is used in the dimensional specification table?
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All dimensions listed in the table — including outer diameter, inner diameter, and height — are expressed in millimeters (mm). Tolerances are also stated in millimeters (mm).
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Why does the tolerance increase as the outer diameter gets larger?
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Larger components naturally have greater dimensional variation during manufacturing due to increased material volume and machining complexity. Tolerances are scaled accordingly — from ±0.2 mm for small diameters (20 mm) up to ±1.5 mm for larger diameters (300 mm) — to reflect realistic and achievable manufacturing precision.
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Can custom outer diameter and inner diameter combinations be ordered?
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Yes. The table provides standard size combinations for reference. Each outer diameter is offered with multiple inner diameter options (e.g., OD 80 mm is available with ID 50, 60, or 70 mm). Custom combinations outside the listed options can be discussed with our engineering team based on your application requirements.
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What is the maximum height available for each size?
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The maximum height varies by outer diameter. For example, OD 20 mm supports heights up to 20 mm, while OD 300 mm supports heights up to 150 mm. The height range for each size is clearly listed in the "Height" column of the specification table above.
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Are tighter tolerances available for precision applications?
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The tolerances shown in the table represent our standard manufacturing specifications. For applications requiring tighter dimensional control, please contact us directly. We can evaluate precision machining options depending on the size range and quantity required.
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Is the height tolerance different from the diameter tolerance for larger sizes?
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Yes, for larger sizes the height tolerance is often tighter than the diameter tolerance. For instance, at OD 150 mm, the diameter tolerance is ±0.8 mm while the height tolerance is ±0.5 mm. At OD 300 mm, the diameter tolerance is ±1.5 mm while the height tolerance is ±1.0 mm. This reflects the different machining processes used for axial versus radial dimensions.