Stihl 029, 039, MS290, MS310, MS390 Crank Shaft Bearings and Seals

Stihl 029, 039, Ms290, Ms310 And Ms390 High Speed Grooved Ball Bearings For Both Sides Of The Crankshaft, Replaces Stihl Parts # 9503-003-0440. These Are High Performance Bearings For High Speed And Load Of The Chain Saw. Crankshaft Seals For Both Sides Of The Crankshaft Replaces Part # 9639-003-1743. You Will Get 2 Bearings And Two Crankshaft Seals Noise tested before and after lubrication Passes V2 noise vibration standards for smaller bearings and V3 standards for larger bore Matched ABMA grade 10 precision balls for roundness Finely honed superfinished raceways for long life and low noise Meet or exceed ABEC 3 tolerances for high quality level