Overview
ISO 21951:2024 - Coated abrasives - Plain discs with holes for dust extraction specifies the nominal dimensions and related requirements for plain abrasive discs designed for use on disc sanders with dust extraction. This second edition updates the 2001 version by adding Type C and providing dimensions for Types A, B and C. The standard helps manufacturers, suppliers and users ensure dimensional compatibility and proper labelling of abrasive discs used with dust-extraction systems.
Key topics and requirements
- Scope: Defines nominal dimensions and hole arrangements for plain discs with holes for dust extraction intended for disc sanders.
- Types: Identifies disc types (A, B, C) and nominal codes; Figures and Table 1 in the standard show the geometry and tolerances for each type.
- Dimensional tolerances: Table 1 contains the permissible deviations for diameters, hole positions and related features. These tolerances apply under specified test conditions.
- Test conditions: Measurements and limit deviations are valid at 20 °C ± 2 °C and relative humidity 65 % ± 5 % (see ISO 554 for standard atmospheres); test pieces must be stored at these conditions for at least 24 hours before testing.
- Designation: A plain disc is designated by the form: Plain disc ISO 21951 [Type] [Nominal code] (example: Plain disc ISO 21951 A 4).
- Marking: Discs must be marked with grain size and manufacturer, supplier, importer or registered trademark.
- Normative reference: ISO 554 (standard atmospheres for conditioning/testing) is referenced for test conditions.
Applications and who uses ISO 21951
- Abrasive disc manufacturers: to design and produce discs that fit standard disc sanders with dust extraction.
- Sander and tool designers: to ensure compatibility between machine extraction ports and abrasive disc hole patterns.
- Quality control and inspection teams: to verify dimensional conformity and perform acceptance testing under prescribed conditions.
- Procurement and suppliers: to specify and source compliant abrasive discs using standard designations.
- Regulatory and safety personnel: to confirm correct labelling and traceability for workplace safety and dust-control systems.
Related standards
- ISO 554 - Standard atmospheres for conditioning and/or testing (normative reference used by ISO 21951).
Keywords: ISO 21951, coated abrasives, plain discs, holes for dust extraction, disc sanders, nominal dimensions, abrasive discs, standard dimensions, dust extraction.