ISO 6531:2024

Overview

ISO 6531:2024 - Machinery for forestry - Portable chain‑saws - Vocabulary is the fifth edition of the international terminology standard for portable chain‑saws. It defines clear, harmonized terms for the mechanical aspects of portable chain‑saws, including the saw‑chain, guide bar, safety devices and control systems. The standard includes illustrative positions (Annex A, Figure A.1) and incorporates updates from the 2017 edition (new bar nose terms, added figure, renumbering and clarifications).

Key topics

ISO 6531:2024 organizes vocabulary by functional groups and includes definitions for:

• Work functions: felling, delimbing, bucking, pruning, boring, splitting, kickback and pinch kickback.
• Types of chain‑saws: chain‑saw for forest service, chain‑saw for tree service, power head.
• Cutting equipment: saw‑chain (drive links, cutters, rivets), chain pitch, drive sprocket (rim/spur), nose sprocket, guide bar, bar nose radius, guide bar tip radius centre point, cutting length.
• Safety devices: chain brake (manual and non‑manual), chain brake lever, front and rear hand‑guards, bar tip guard, chain catcher, clutch cover, guide bar cover, stop switch, throttle trigger lockout.
• Control and starting systems: chain tension adjuster, choke, primer, recoil starter, electric starter, throttle trigger and throttle control system, throttle control latch.
• Carburettor settings: idle‑speed adjuster, low/high‑speed mixture adjusters.
• Handles and ergonomics: front handle, rear handle, wrap‑around handle (RSU use).
• Exhaust and miscellaneous: muffler, spark arrester, clutch, spiked bumper, attachment point, idling speed, maximum power speed (see ISO 7293).

Applications and users

ISO 6531:2024 is a practical reference for:

• Manufacturers - consistent terminology in design, parts documentation and user manuals.
• Regulators and conformity assessors - harmonized definitions used in legislation, test protocols and certification.
• Testing laboratories - unambiguous term set for test reports and specifications.
• Technical writers and trainers - clear language for operating instructions, safety training and maintenance guides.
• Designers and safety professionals - common vocabulary when addressing hazards such as kickback, chain‑brake performance and guard design.

Using ISO 6531:2024 improves clarity in procurement, international trade, documentation and injury prevention through consistent chain‑saw safety language.

Related standards

• ISO 7293 (referenced for maximum power speed) and committee guidance from ISO/TC 23 (Tractors and machinery for agriculture and forestry). Note: ISO 6531:2024 states there are no normative references within the document itself.