Garage Door Opener Rail Parts & Extensions - Door Arms
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Replacement garage door opener rail parts for LiftMaster, Chamberlain, Genie, Marantec, Sommer, Linear and Hormann: belt caps, tensioners, chain spreaders, bullets, rail clamps, wire clips, complete rails and rail extension kits.
Find your brand in the guide below the products.
Rail parts by brand
| Brand | Rail parts |
|---|---|
| LiftMaster / Chamberlain | Belt drive: 41C76 belt cap and sprocket, 41A4371 belt cap retainer, 41B4103 belt tensioner, 29B130 belt connector. Chain drive: 41A4208-2 and 41A5615 chain spreader kits, 4A1008 master link. Square rail: 41A5665 rail, 41A7276 wear pads, 41D598-1 U bracket. Also 041A6550 rail clips, 197LM wire channel |
| Genie | Rail extension kits for 8' doors: EKCC chain, EKBC belt, EKSC screw. Bullets 37557R.S (chain) and 37556R.S (belt), 37857R.S tensioner, 37844R.S bearing block, 21019B04 rail clamp |
| Marantec | 2-piece rails for 7', 8', 10', 12' and 14' doors; 8030196 belt connector kit, 96834 / 98875 tabs |
| Sommer | Rail extensions 9'9" and 11'6", 3' and 5'; US3123 side mount kit, ceiling brackets |
| Linear / Hormann | Linear HAE00019 wire clips, CSB center support; Hormann D436255 center support |
Raising a door from 7' to 8'?
Many openers need a rail extension for an 8' door. Genie sells separate kits for chain, belt and screw drive rails (37301R, 37302R, 37303R). Rail length is based on door height, so check your opener's manual for the exact rail or extension kit.
Looking for the trolley? See carriages. Need a chain or belt? See chains and belts. Call 877-379-4947 with your opener model.
Frequently Asked Questions
What is the trolley on a garage door opener?
The trolley (Genie calls it the carriage) rides along the opener rail and connects to the door arm. Pulling the emergency release handle disconnects the outer trolley from the inner trolley, so you can move the door by hand; it re-engages when the opener runs.
