The Stihl 42247040502 is a genuine OEM replacement shaft designed for various Stihl BR series backpack blowers and SR series mistblowers. This essential component ensures proper operation and power transmission within the machine. Confirmed fitment includes models such as BR 500, BR 550, BR 600, BR 700, BR 700 X, BR 800 C-E, BR 800 X, SR 430, and SR 450. With a length of 368.3 mm and a weight of 0.113 kg, this shaft is built to Stihl's rigorous quality standards for durability and performance.