Genuine STIHL OEM chain sprocket drum, part number 11256402004 (1125 640 2004). Designed with 3/8″ pitch and 7-tooth profile. Compatible with chainsaw models 029, 034, 036, 039, MS290, MS310, and MS390. Built for smooth power transfer and long-lasting durability.
✅ Genuine STIHL OEM part for accurate fit and factory-level reliability
✅ 3/8″ pitch, 7-tooth design for smooth chain drive operation
✅ Compatible with STIHL 029, 034, 036, 039, MS290, MS310, MS390
✅ Heavy-duty metal construction ensures strength and durability
✅ Direct-fit replacement for quick and simple installation