The requirements of this standard apply to internal combustion engine-powered hand-held chain saws and replacement saw chains for use primarily in cutting wood. This standard shall be applied to new products within 2 years of the publication date and manufacturers may apply this standard to existing products. NOTE ?C Metric units are included for information only. Purpose The purpose of this standard is to establish safety and environmental requirements for internal combustion engine-powered hand-held chain saws and replacement saw chains.