Overview
ISO 21982:2020 specifies technical requirements and dimensions for ratcheting wrenches used to assemble or disassemble hexagonal and double-hexagonal fasteners. It covers both combination ratcheting wrenches (Type I) and double‑headed box ratcheting wrenches (Type II) in Classes A–C (flat, offset with reversing device, flexible head). These tools are explicitly not intended for impact use.
Key topics and requirements
- Classification and designation: Defines Type I (combination) and Type II (double‑headed), with Classes A, B, C. Prescribes designation format (ISO 21982 + type + class + sizes + length).
- Dimensions: Detailed maximum/minimum dimensions for head widths, thicknesses and overall lengths are tabulated for nominal across‑flat sizes (see Tables 1–2). Tolerances refer to ISO 691 and dimensions reference ISO 7738 and ISO 3318 where noted.
- Hardness: Specifies hardness test locations and minimum values. For example, open‑end hardness is ≥42 HRC for s ≤ 34 mm and ≥39 HRC for s > 34 mm; ratchet rotating gear hardness is ≥45 HRC. Tests in accordance with ISO 6507‑1 or ISO 6508‑1.
- Torque and reversing torque testing: Box‑end reversing torque limits are given by size bands (e.g., 6–11 mm → 0.07 N·m; 20–41 mm → 0.35 N·m). Minimum torque tests for box and open ends reference ISO 1711‑1 (series A for box, series C for open).
- Durability tests:
- Cycle testing: Non‑reversible wrenches - 5 000 cycles in one direction; reversible wrenches - minimum 2 500 cycles in each direction at 35% of the minimum test torque (≤ 60 cycles/min).
- Drop testing: 12 drops from 1.8 m onto concrete (six vertical with box‑end down, six horizontal).
- Function checks: Flexible heads and reversing levers must set and hold position without excessive force.
- Test sequence: A defined order for reversing torque, torque, drop, function and cycle tests is provided so all tests can be applied to the same sample.
- Marking: Tools must be permanently marked with the nominal width (mm) and manufacturer/trademark.
Applications and users
ISO 21982:2020 is practical for:
- Manufacturers and designers of hand tools and ratcheting wrenches (product design, quality engineering)
- Test laboratories performing hardness, torque, cycle and drop testing
- Purchasing and procurement teams specifying compliant assembly tools for production lines
- Maintenance, automotive, aerospace, industrial assembly operations that require robust, standardized ratcheting wrenches
Key practical benefits include consistent interchangeability, verified durability, and clear product labelling for safety and procurement.
Related standards
Keywords: ISO 21982:2020, ratcheting wrenches, technical requirements, assembly tools, torque testing, hardness, cycle testing, wrench dimensions.