The International Organization for Standardization (ISO). The text of ISO 11681-2:2006 has been approved by CEN as EN ISO 11681-2:2006 without any modifications. This document supersedes EN ISO 11681-2:1998. 29p. This part of ISO 11681 specifies safety requirements and their verification for the design and construction of portable combustion-engine, hand-held chain-saws for tree service, having a maximum mass, without guide bar or saw chain and with tanks empty, equal to 4,3 kg, and designed for use by a trained operator for pruning and dismantling standing tree crowns