Order Today to get your equipment back to in top shape. Troy-Bilt 21" 24" Snow Blower Replacement Drive Chain These rugged drive chains measure 21" with 42 pins/rollers including a supplied master joiner link. Our Premium #41 chains are rugged to ANSI Standards with hardened solid steel rollers and pins. Shot peened side plates for stress relief, improved fatigue resistance and longer service life. Bulk Packaged - No retail packaging. Quick and easy installation with included master joiner link. Chain Pitch: 0.500" Roller Diameter: 0.306" Roller Width: 0.250" Pin Diameter: 0.141" Plate Thickness: 0.050" Tensile strength: 2100 Pounds This part is compatible with the following machines: Troy-Bilt 42000 - Troy-Bilt 21" Snow Thrower (SN: 420000100101 - 420001199999) - MAIN ASSEMBLY Troy-Bilt 42027 - Troy-Bilt 21" Snow Thrower (SN: 420270100101 - 420271199999) - MAIN ASSEMBLY Troy-Bilt 42035 - Troy-Bilt 24" Snow Thrower (SN: 420350100101 - 420350199999) - Handlebar And Drive Assemblies Troy-Bilt 42046 - Troy-Bilt 24" Snow Thrower - Handlebar And Drive Assemblies Troy-Bilt 42050 - Troy-Bilt 24" Snow Thrower - Handlebar And Drive Assemblies If your drive chain is making a popping / clicking noise or sounds like it is binding when it runs, not running as quiet as it once did , the chain is worn/stretched beyond it's service limit and ready to fail. Order replacements now to have on hand for the inevitable. Please measure and verify the actual # of links or the overall length of your drive chain before ordering. If the chain you need is longer or shorter, contact us, we will make one especially for your needs.