What is ISO 6533 about?
ISO 6533 discusses forestry machinery. ISO 6533 specifies the dimensions and clearances for front handguards and their openings on portable hand-held chain-saws. These dimensions and clearances ensure the necessary safety provided by the hand-guard, which serves as both a shield between the operator’s hand and the saw chain and as an actuator for manually operated chain brakes.
Note: For chain-saws with wrap around handles, ISO 6533 is not applicable to the portion of the front handle to the right (when viewed from the rear) of the top brace.
Who is ISO 6533 for?
ISO 6533 on Dimensions and clearances for portable chain-saw front hand-guard is useful for:
- Chainsaw manufacturers
- Tree loggers
- Carpenters
- Hardware store owners
Why should you use ISO 6533?
Chain-saws are the most efficient tools when it comes to cutting wood and trees. The front hand-guard acts as protection from the cutting chain and helps the user to manoeuvre the chain-saw.
If they are not installed or are not produced with proper regulation, they can endanger the safety of the end-user.
ISO 6533 specifies the dimensions for gauges and front hand-guard of chain-saw. ISO 6533 also provides you with the clearance requirements between the hand-guard and the chain-saw body and between the hand-guard and the front handle. These specifications help you to produce a portable chainsaw front hand-guard that reduces the risk of accidents and ensure consumer safety.
What’s changed since the last update?
BS ISO 6533:2020 replaces ISO 6533:2012, which has been technically revised. The main changes compared to the previous edition are as follows:
- To reflect worst-case conditions, it has been clarified, that handle clearance between front handle and front hand-guard, measured with gauge A, shall be fulfilled without pre-load on the front hand-guard as described in Clause 4 b) 2)
- To reflect worst-case conditions, it has been clarified that height H1 shall be passed with pre-load on the front hand-guard as described in Clause 4 b) 2) and H1A without pre-load on the front hand-guard
- To proscribe direct contact by the fingers (≤120 mm), a safety radius > 120 mm around the closest unprotected part of the saw-chain was defined
