Stihl 3686 000 0074 - RM Chainsaw Chain - 74 Drive Links Challenge Xtreme the MS161T / MSA161T requires

the MS161T / MSA161T requires a 57 drive link chain

Stihl 3686 000 0081 Chainsaw Chain - Stihl Rapid Micro - RM - 81 Drive Links

Helps prevent premature wear

30030002038 uses a 3/8" pitch chain

Stihl 3686 000 0074 - RM Chainsaw Chain - 74 Drive Links Challenge Xtreme the MS161T / MSA161T requiresStihl 3686 000 0074 Chainsaw Chain Stihl Rapid Micro RM 74 Drive Links Semi chisel chain. Excellent control and high cutting performance. Relatively easy to sharpen. Uses include felling, bucking, limbing and all sawing work in agriculture, construction and forestry. Chain Pitch; 0. 325" Chain Gauge; 1. 6mm (0. 063") Sharpening File Size; 4. 8mm (3 16") We recommend that you count the number of drive links in your old chain prior to ordering.