Oregon R-Series Chainsaw Chain Get link Facebook X Pinterest Email Other Apps Oregon Chainsaw Chain | Chainsaw Chain Lookup 3/8" pitch 90SG Micro Lite chain .043" gauge Chamfer chisel Uses 5/32" (4mm) diameter sharpening file Select Oregon R-Series chain loops below to find Oregon R-Series chain online.R28 Chain Loop 90SG028G 6"R34 Chain Loop 90SG034G 8"R40 Chain Loop 90SG040G 10"R44 Chain Loop 90SG044G 12"R50 Chain Loop 90SG050G 14"R55 Chain Loop 90SG055G 16"R56 Chain Loop 90SG056G 16"