BS ISO 21538:2024
Blanks for superabrasive cutting-off wheels. Mounting and fixing bores. Building construction and civil engineering
- Standard No.
- BS ISO 21538:2024
- Release Date
- 2024
- Published By
- British Standards Institution (BSI) GB / BSI
- Latest
- BS ISO 21538:2024
- Introduction
Interpretation of the core content of the standard
BS ISO 21538:2024 specifies the general dimensional requirements for mounting holes in superhard cutting wheel blanks, and is applicable to the fields of construction and civil engineering. The latest third edition has the following major updates compared to the 2016 edition:
Technical elements 2016 edition 2024 edition Impact of changes Diagram specifications Figure 1-2 Old version layout Modify diagram annotation method Improve dimension recognition Dimension parameters Table 1 Basic parameters Add key dimensions Expand applicable scenarios Drive hole spacing Radial ≥10mm Radial ≥14mm Enhanced structural stability
Hole type classification and technical specifications
The standard defines 5 standardized hole types:
- Type A: Center hole without hole ring
- Type B: Single drive pin hole ring
- Type C: Double drive pin hole ring (maximum allowable)
- Type D: Double mounting hole ring
- Type E: Mixed design of drive pin + mounting hole
Key dimensional requirements include: Single-sided arrangement limit of chip hole, Maximum 2 countersunk head diameters, Number of additional through holes ≤2, etc.
Key points of application in the construction field
In the cutting of high-rise building steel structures, the Type C hole type (900×60×100/120) can meet the dynamic balancing requirements of large-diameter grinding wheels:
- Radial spacing ≥14mm to prevent resonance
- Tangential spacing ≥30mm to ensure torque transmission
- Pitch circle spacing ≥20mm to reduce stress concentration
Standard implementation recommendations
1. Matchability verification: Need to be used in conjunction with ISO 21537-2 flange standard
2. Tolerance control: Non-standard dimensions refer to ISO 2768-1 general tolerance
3. Safety Warning: The grinding wheel speed must not exceed the manufacturer's calibration value
BS ISO 21538:2024 Referenced Document
- ISO 21537-2 Clamping flanges for superabrasive cutting-off wheels - Part 2: Building and construction
- ISO 2768-1 General tolerances; part 1: tolerances for linear and angular dimensions without individual tolerance indications
BS ISO 21538:2024 history
- 2024 BS ISO 21538:2024 Blanks for superabrasive cutting-off wheels. Mounting and fixing bores. Building construction and civil engineering
- 2016 BS ISO 21538:2016 Blanks for superabrasive cutting-off wheels. Mounting and fixing bores. Building construction and civil engineering
- 2004 BS ISO 21538:2004 Blanks for superabrasive cutting-off wheels - Mounting and fixing bores - Building construction and civil engineering
