The Genie 28421B06 Shoulder Bolt is a genuine OEM replacement fastener for Genie garage door openers. It provides a precision shoulder that serves as a pivot or axle point for components such as idler pulleys or linkage joints within the rail or door arm assembly, helping maintain alignment and smooth movement. Use this part to replace a worn, stripped, or missing shoulder bolt and restore reliable operation on select Genie chain-drive and belt-drive systems. For exact fit, confirm 28421B06 in your opener’s parts diagram or owner’s manual.
Installation typically involves disconnecting opener power, relieving chain/belt tension, removing the retaining hardware, swapping in the new shoulder bolt, and reassembling before re-tensioning according to Genie specifications. Tighten securely while ensuring the pulley or pivot rotates freely to prevent binding. Support the rail during service, keep hands clear of pinch points, and test door balance and safety reversal after reassembly. This OEM Genie shoulder bolt is commonly referenced in rail, idler, or door arm hardware sections, making it an ideal replacement part for residential and certain commercial Genie opener applications where 28421B06 is specified.