Compatible with HUSQVARNA chainsaws Models 2141, 340, 340 E, 345, 345 E, 350 351, 51, 51 EPA, 55, 55 EPA DIMENSIONS: Cylinder diameter: 40 mm Bolt diameter: 10 mm Reference code: 179-250 Original part number: 503 87 01-02, 503 89 96-01 593 89 96-71, 537 39 97-02 HUSQVARNA