Overview
ISO 21537-2:2004 - "Clamping flanges for superabrasive cutting-off wheels - Part 2: Building and construction" specifies the dimensions, design and supply requirements for clamping flanges used to mount superabrasive cutting-off wheels (diamond saws) for cutting mineral materials. It covers flanges for stationary, mobile and hand‑held cutting-off machines used in building and construction, and provides dimensional tables and figures for five flange types (A–E).
Key topics and technical requirements
- Scope and application: Dimensions for clamping flanges used with superabrasive cutting-off wheels on machines for building and construction.
- Flange types: Detailed dimensions (figures and tables) are given for:
- Type A - hand-held cutting-off machines
- Type B - masonry cutting-off machines
- Type C - joint cutting machines
- Type D - joint cutting (flush cuts) / hub flanges
- Type E - wall cutting-off machines / hub flanges
- Dimensional tolerances: General tolerances referenced to ISO 2768‑1.
- Material requirement: Steel with an elastic limit of at least 300 MPa (manufacturer’s choice of material otherwise).
- Design rules:
- Certain flange types (A1–C3) are intended to be used in specified paired combinations (e.g., A1/A3, B1/B3).
- Types A2, B2, C2 include a closed driving pin on the rear side resistant to torque; drive pins must not project beyond the clamping flange.
- Supply schedule and fasteners:
- Types A–C: supplied as a fixed and a loose flange; drive pins pressed into the fixed flange.
- Type D: hub flanges supplied with hexagon socket countersunk screws.
- Type E: hub flanges supplied with hexagon screws threaded up to the head plus additional hexagon socket countersunk screws.
- Only screws intended by the machine manufacturer shall be used.
- Designation and marking:
- Example designation format: Flange ISO 21537-2 - B1 - 700 ×××× 9.
- Flanges must be indelibly marked with the maximum diameter of the compatible cutting-off wheel.
Applications and users
ISO 21537-2 is primarily used by:
- Manufacturers of clamping flanges, diamond cutting-off wheels and cutting machines
- Machine designers and mechanical engineers specifying wheel mounting systems
- Quality, safety and maintenance engineers ensuring correct flange/wheel compatibility
- Procurement and compliance teams requiring standardized parts for building and civil works
Benefits include improved interchangeability, mechanical safety (torque resistance and secure clamping) and clearer supplier/manufacturer communication.
Related standards
- ISO 21537-1 - Clamping flanges for superabrasive cutting-off wheels - Part 1: Natural stone
- ISO 2768-1 - General tolerances for linear and angular dimensions
Keywords: ISO 21537-2, clamping flanges, superabrasive cutting-off wheels, diamond saws, building and construction, flange dimensions, flange types A–E, ISO 2768, wheel mounting.