The Genie 086654.2816.S is an OEM sprocket assembly designed for use on Genie MH (Medium H-rail) and MJ (Medium Jackshaft) commercial door operators, fitted for ANSI #41 roller chain (0.500 in pitch). This variant features a 28T, 1-inch bore configuration. Selecting the correct tooth count and bore diameter is critical: an incorrect tooth count will produce the wrong gear ratio, and an incorrect bore diameter will not fit the operator shaft. The MH/MJ series uses #41 chain and is not interchangeable with the J/H/GH series which uses #50 chain. Sold as one sprocket assembly (each).
A: This sprocket is designed specifically for #41 ANSI roller chain, which has a 0.500-inch pitch. Using #50 or any other chain pitch will result in improper mesh, accelerated wear, and potential drivetrain failure.
A: The bore diameter is 1 inch. Verify your operator drive shaft is exactly 1 inch before ordering, as an incorrect bore will prevent proper shaft fit and may cause slippage or damage.
A: This sprocket assembly is engineered for the Genie MH (Medium H-rail) and MJ (Medium Jackshaft) commercial door operator platforms. It is not confirmed for use on Genie residential or other commercial series without verification.
A: The 28-tooth count on the drive or driven sprocket directly determines the chain speed and mechanical advantage ratio. Substituting a different tooth count will alter the door travel speed and load characteristics, potentially voiding operator performance specifications.
A: Genie commercial sprockets in this family are typically manufactured from steel for durability under the cyclic loading demands of commercial door applications. Consult Genie or an authorized distributor to confirm material certification if required for your installation.
