This 20"Bar is .325 pitch, .050 gauge and use a 78 drive link chain and works great on Echo models CS350, CS-3600, CS3700, CS3900, CS4000, CS4200, CS-400EVL, CS-440EVL, CS-440, CS-450, CS-450P, CS-490, CS-510, CS-520, CS-530, CS-500P, CS-550P, CS3600, CS-3900, CS4000, CS-4400, CS-4500, CS-4600, CS-5000, CS5100.
Note: Your chainsaw must be equipped with a .325 pitch sprocket for this bar and to chain to work properly.
Bar fits the following Poulan saws with .325 pitch sprocket-285,295,305,306SA,,2700,2775,2800,2900 FARM HAND,3000,3050,3100,3300,4600,4620,4620AV,4620AVX, AND FITS SEARS 35020,35021,35119,35120,35121,35492,35707,35628 and 35633. Also works on many Echo,poulan, sears, red max, shindaiwa and others. Some models are 3/8 pitch and this bar and chain will not fit unless you change to a .325 pitch sprocket.
Archer Saw Chain and Archer Guide Bars are known for quality and sold world wide!