Rely on the High-Performance Oregon S40 Replacement Chain for Your 10″ Chainsaw The Oregon S40 10″ Replacement Chain was engineered for superior performance with a smooth cutting action. The Chamfer Chisel cutters along with a notched bumper drive provides a good chip flow with low kickback. Installation is simple for saws with a low-profile, 3/8″ pitch chain with the 4-way symmetrical tie straps.