Overview
ISO 6534:2023 - Forestry machinery - Portable chain-saw hand-guards - Mechanical strength - specifies mechanical strength requirements and test methods for the front and rear hand-guards of portable, hand-held chain-saws used primarily in forestry and tree service. This fourth edition (2023) replaces ISO 6534:2007 (with amendment) and adds updated scope, clarified breakage criteria, conditioning instructions and impact-point definitions.
Key topics and technical requirements
- Scope: Applies to mechanical strength of front and rear hand-guards and associated test procedures.
- Impact tests:
- Performed with a pendulum hammer (arm length 700 mm ± 5 mm) producing impacts of 10 J ± 0.3 J (high-energy) and 5 J ± 0.2 J (durability blows).
- Impact angle: 45° ± 5° relative to guide bar axis.
- Front guard impact at midpoint of effective guard width (per ISO 6533:2020).
- Rear guard impact at a defined intersection point near throttle/handle; adjusted if within 10 mm of the guard edge.
- Temperature conditioning:
- Impact tests performed at +40 °C ± 2 °C and −25 °C ± 3 °C; chain-saw conditioned for at least 6 h and tested within 60 s of removal.
- Durability tests at +20 °C ± 5 °C, conditioned for at least 6 h.
- Durability tests:
- Repeat 25 blows of 5 J ± 0.2 J at the same defined impact points for front and rear guards.
- Acceptance criteria:
- Hand-guards shall not break or crack under specified tests.
- Front guard must not deflect sufficiently to allow the pendulum to swing past.
- Reinforcing rib fracture on rear guard is acceptable provided the guard surface facing the operator shows no breakage or cracks.
- For rear hand-guards integrated with fuel tanks, any fuel leakage detected after tests is considered a failure (inspect by holding the saw in specified positions).
Applications and users
This standard is practical for:
- Manufacturers of portable chain-saws designing or validating hand-guards for forestry and tree service equipment.
- Test laboratories and certification bodies performing mechanical strength, impact and durability testing.
- Product safety engineers, compliance officers, and procurement specialists specifying safety requirements.
- Regulators and standards committees harmonizing equipment safety and conformity assessment.
Keywords: ISO 6534:2023, forestry machinery, portable chain-saw, hand-guards, mechanical strength, impact test, durability test, chain-saw safety.
Related standards
This document provides clear, repeatable test methods and pass/fail criteria to ensure hand-guard integrity and operator protection in real-world forestry and tree-service conditions.
