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Standard Dimensional Tolerances Reference Table (Unit: mm)
| 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 |
Frequently Asked Questions
Q
What do the outer diameter and inner diameter values in the table represent?
The outer diameter refers to the total external measurement across the widest point of the component, while the inner diameter refers to the measurement of the hollow or bore section inside the component. Both are listed in millimeters (mm).
Q
Why do tolerance values increase as the outer diameter gets larger?
Larger components are inherently more difficult to manufacture with the same level of precision as smaller ones. As dimensions increase, slight variations in material behavior and machining processes result in wider acceptable tolerance ranges, which is reflected in the table.
Q
Can custom dimensions outside of the listed sizes be ordered?
Yes, custom dimensions beyond the standard sizes listed in the table are available upon request. Please contact our technical team with your specific requirements, and we will provide a tailored solution along with applicable tolerance specifications.
Q
What does the height range (e.g., 5～20) indicate?
The height range indicates the minimum and maximum available height options for a given outer diameter. For example, an outer diameter of 20mm can be produced with heights ranging from 5mm to 20mm, giving customers flexibility to select the most suitable height for their application.
Q
Are the tolerances listed the tightest achievable, or can tighter tolerances be requested?
The tolerances shown in the table represent standard manufacturing tolerances. Tighter tolerances may be achievable depending on the material and size, but may involve additional processing time and cost. Please consult with our engineering team for special tolerance requirements.
Q
Why are there multiple inner diameter options for the same outer diameter?
Multiple inner diameter options for a single outer diameter allow for different wall thicknesses, accommodating various load-bearing, flow, or structural requirements. This flexibility ensures that the component can be matched precisely to the intended application without needing a fully custom design.