ISO 13942:2019

Overview

ISO 13942:2019 - Bonded abrasive products - Limit deviations and run-out tolerances defines the essential dimensional tolerances and run‑out (axial and radial) requirements for bonded abrasive products. The standard covers a wide range of product types (straight, recessed, relieved, hubbed, dish and cup wheels, cutting-off wheels, segments, cones, plugs, honing stones, finishing sticks, and spindle‑mounted points/wheels) and references established geometric tolerancing practices. It is intended for manufacturers, test laboratories, quality engineers and purchasers who need consistent, measurable limits for abrasive-product geometry and assembly.

Key topics and technical requirements

• Scope and terminology: Adopts terms and definitions from ISO 286-1 and uses ISO geometric tolerancing symbols (ISO 1101, ISO 5459).
• Product shapes: Identifies relevant shape types according to ISO 525 (for example: types 1, 3, 4, 5, 7, 20–26, 38–40 for straight grinding wheels).
• Limit deviations and run‑out tolerances:
  • Outside diameter tolerances (T_D) and run‑out tolerances (axial T_PL and radial T_RL) are tabulated by diameter ranges (see Table 2). Example: for D = 8–20 mm the outside diameter tolerance is ±0.8 mm with axial run‑out 0.2 mm and radial run‑out 0.3 mm; for D = 50–125 mm T_D = ±2.0 mm, axial 0.2 mm, radial 0.4 mm.
  • Hole and recess diameter limits are provided (see Tables 3 and 4) with size-specific positive limit deviations and maximum recess radii.
• Thickness and bore tolerances: Overall thickness, smallest thickness for tapered/depressed wheels, thickness at bore, wall and rim widths are specified with limit deviations for different product categories.
• Special cases: Requirements for high‑pressure wheels, wheel sets, wheels with threaded inserts and spindle‑mounted points are included.

Practical applications and users

• Who uses ISO 13942:
  • Abrasive-product manufacturers to design and control production tolerances.
  • Quality control and inspection labs to accept/reject parts based on standardized limits.
  • Machine shops and toolrooms to select wheels that meet fit and run‑out requirements for safe, accurate grinding.
  • Procurement and regulatory compliance teams for specifying accepted tolerances in purchase orders.
• Benefits:
  • Improves interchangeability, safety and grinding accuracy.
  • Reduces rejects, assembly issues and machine vibration related to excessive run‑out.
  • Facilitates conformity assessment and international trade by using recognized tolerance classes.

Related standards

• ISO 525 (shape types), ISO 603 (popular dimensions of products), ISO 286‑1/‑2 (tolerance bases and tables), ISO 1101 and ISO 5459 (geometric tolerancing). For implementation details, refer to the full ISO 13942:2019 document.