Overview
ISO 21951:2001 specifies the nominal dimensions and basic requirements for coated abrasive plain discs with holes for dust extraction. These discs are intended for use on disc sanders with dust-extraction systems. The standard defines disc types, hole patterns and nominal codes to ensure interchangeability, consistent fitment and predictable dust-removal performance across products and suppliers.
Key topics and requirements
- Scope: Nominal dimensions of plain abrasive discs with holes for dust extraction; intended application on disc sanders.
- Disc types: Two main geometries are defined (Type A and Type B) with specific hole patterns and nominal codes. The standard provides a table of nominal dimensions and the corresponding hole arrangements.
- Limit deviations: Dimensional tolerances (limit deviations) are specified in the standard and apply under defined test conditions.
- Test conditions: Measurements and tolerances are valid when discs are conditioned at 20 °C ± 2 °C and relative humidity 65 % ± 5 % (in accordance with ISO 554). Discs shall be stored for at least 24 hours under these conditions prior to testing.
- Designation format: A standardized designation format is provided to identify discs, for example: Plain disc ISO 21951 A 4 (Type A, nominal code 4).
- Marking: Discs must be marked with at least the grain size and the manufacturer, supplier, importer or registered trademark, to support traceability and correct product selection.
Applications and who uses this standard
ISO 21951 is practical for organizations involved in the production, procurement, testing and use of coated abrasive discs:
- Manufacturers of coated abrasives and accessory suppliers use the standard to design and mark discs that fit common disc sander extraction systems.
- Tool and equipment designers ensure their disc sanders accept standardized disc dimensions and hole patterns for effective dust extraction.
- Quality control and testing labs apply the test-conditioning and tolerance rules when verifying product compliance.
- Purchasers and maintenance teams in woodworking, metalworking and surface-finishing industries use the standard to specify compatible abrasive discs for dust-managed sanding operations.
Related standards
- ISO 554:1976 - Standard atmospheres for conditioning and/or testing (referenced for test conditions).
- ISO 6344 series - Coated abrasives - Grain size analysis (relevant for marking and grain-size determination).
Keywords: ISO 21951, coated abrasives, plain discs with holes, dust extraction, disc sanders, nominal dimensions, disc designation, abrasive disc marking.