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All dimensions are in millimeters (mm). Tolerances apply to standard production runs. Custom sizes and tighter tolerances are available upon request.
| 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
Q
What unit are the dimensions listed in this table?
A
All dimensions — including outer diameter, inner diameter, and height — are expressed in millimeters (mm). Tolerances are also provided in millimeters.
Q
Why do larger sizes have greater tolerances?
A
As the outer diameter increases, manufacturing processes naturally introduce greater dimensional variation. Larger parts require more material and are subject to more thermal expansion and machining deviation, which is why tolerances increase from ±0.2 mm for small sizes up to ±1.5 mm for sizes reaching 300 mm.
Q
Can I request a custom inner diameter not listed in the table?
A
Yes. The inner diameter options shown represent standard configurations. Custom inner diameters can be accommodated based on your specific application requirements. Please contact us with your specifications for a tailored solution.
Q
Is it possible to achieve tighter tolerances than those listed?
A
Tighter tolerances beyond the standard values in this table may be achievable depending on the material, size, and production method. Please discuss your precision requirements with our engineering team to determine feasibility and any associated cost implications.
Q
What is the maximum height available for each outer diameter size?
A
The maximum height varies by outer diameter. For example, a 20 mm outer diameter supports heights up to 20 mm, while a 300 mm outer diameter can reach heights up to 150 mm. Refer to the "Height" column in the table above for the full range per size.
Q
Why does the height tolerance sometimes differ from the outer and inner diameter tolerances?
A
Height tolerances are controlled by different machining processes compared to diameter tolerances. In some larger sizes (e.g., 150 mm and 200 mm outer diameter), the height tolerance is tighter than the diameter tolerance because axial machining can be more precisely controlled than radial forming at larger scales.