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Standard Dimensional Specifications & Tolerances
| Outer Diameter (mm) |
Inner Diameter (mm) |
Height (mm) |
Outer Dia. Tolerance (mm) |
Inner Dia. 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 and inner diameter values represent in this specification table?
A
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 bore or opening inside. Both are listed in millimeters (mm) and define the standard size range available.
Q
Why do tolerances increase as the outer diameter gets larger?
A
Larger components naturally accumulate more dimensional variation during manufacturing. As the outer diameter increases from 20mm to 300mm, the allowable tolerance range increases from ±0.2mm to ±1.5mm to account for material expansion, machining limitations, and practical manufacturing precision at larger scales.
Q
Can I order components with dimensions not listed in the standard specification table?
A
Yes, custom dimensions are typically available upon request. The table represents standard stock sizes for quick delivery. For non-standard outer diameters, inner diameters, or heights, please contact our technical team to discuss feasibility, lead times, and custom tolerance requirements.
Q
What is the height range available for each outer diameter size?
A
Each outer diameter size corresponds to a specific height range. For example, a 20mm outer diameter is available in heights from 5mm to 20mm, while a 300mm outer diameter supports heights from 10mm to 150mm. The height range generally increases alongside the outer diameter to maintain structural integrity.
Q
Why does the height tolerance sometimes differ from the outer and inner diameter tolerances?
A
Height tolerances are controlled by a different machining process than diameter tolerances. In some larger sizes (e.g., 150mm and 200mm outer diameters), the height tolerance is tighter than the diameter tolerance because height is typically cut in a single pass and can be held to a more precise standard than radial dimensions.
Q
Are multiple inner diameter options available for a single outer diameter?
A
Yes. Many outer diameter sizes offer two or more inner diameter options. For instance, an 80mm outer diameter is available with inner diameters of 50mm, 60mm, or 70mm. This flexibility allows you to select the appropriate wall thickness for your specific application requirements.