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| 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 do the outer diameter and inner diameter values in the table represent?
A
The outer diameter refers to the total external measurement of the component, while the inner diameter refers to the bore or hole diameter. Multiple inner diameter options (e.g., 15/20) indicate available configurations for that outer diameter size.
Q
Why do tolerance values increase as the diameter gets larger?
A
Larger components inherently involve greater material volume and machining complexity. As the outer diameter increases from 20mm to 300mm, the dimensional tolerances widen accordingly — from ±0.2mm to ±1.5mm — to account for practical manufacturing limitations while maintaining functional precision.
Q
Can I request a custom height outside the listed range?
A
Yes. The height ranges listed in the table (e.g., 5～20mm, 10～150mm) represent standard production ranges. Custom heights beyond these ranges may be available depending on the outer diameter and material. Please contact us with your specific requirements for a feasibility assessment.
Q
Are tighter tolerances available for precision applications?
A
The tolerances listed represent standard manufacturing specifications. For applications requiring tighter tolerances — such as aerospace, medical, or high-precision industrial uses — customized machining options may be available. Please reach out to discuss your specific tolerance requirements.
Q
What is the height tolerance difference between outer diameter and height for larger sizes?
A
For larger sizes (150mm and above), the height tolerance is intentionally kept tighter than the outer and inner diameter tolerances. For example, at 200mm outer diameter, the diameter tolerances are ±1.0mm while the height tolerance remains ±0.8mm. This reflects the importance of axial precision in many assembly applications.
Q
How should I select the correct inner diameter for my application?
A
When multiple inner diameter options are listed for a given outer diameter, selection depends on your shaft size, wall thickness requirements, and load-bearing needs. A thicker wall (larger difference between outer and inner diameter) generally provides greater structural strength, while a thinner wall reduces weight and material cost.