You can access detailed guides and full tolerance tables through these technical document repositories:
While ISO 9908 outlines the general design and performance requirements, ISO 20457 gets into the granular details of the physical dimensions. It defines the permissible deviations from the nominal dimensions for various pump parts, such as impellers, shafts, housings, and seals.
The standard uses two main tables to determine the applicable tolerance: INTERNATIONAL STANDARD ISO 20457
This table provides permissible deviations in millimeters for external sizes (shafts), internal sizes (holes), and features like step heights or radii. For a nominal size range (e.g., 0.5 mm up to 3000 mm), the table lists the upper and lower deviation limits for each class. For example, a 100 mm linear dimension under the “medium” class might show a tolerance of ±0.3 mm, while the “fine” class would show a tighter ±0.1 mm.
ISO 20457 provides:
If your company still uses DIN 16901 or a custom “shop standard,” transitioning to ISO 20457 reduces confusion with international suppliers.
You can access detailed guides and full tolerance tables through these technical document repositories:
While ISO 9908 outlines the general design and performance requirements, ISO 20457 gets into the granular details of the physical dimensions. It defines the permissible deviations from the nominal dimensions for various pump parts, such as impellers, shafts, housings, and seals. iso 20457 tolerance table pdf
The standard uses two main tables to determine the applicable tolerance: INTERNATIONAL STANDARD ISO 20457 You can access detailed guides and full tolerance
This table provides permissible deviations in millimeters for external sizes (shafts), internal sizes (holes), and features like step heights or radii. For a nominal size range (e.g., 0.5 mm up to 3000 mm), the table lists the upper and lower deviation limits for each class. For example, a 100 mm linear dimension under the “medium” class might show a tolerance of ±0.3 mm, while the “fine” class would show a tighter ±0.1 mm. For a nominal size range (e
ISO 20457 provides:
If your company still uses DIN 16901 or a custom “shop standard,” transitioning to ISO 20457 reduces confusion with international suppliers.