Garage Door Opener Door Arms - Rail Parts, Other
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Replacement garage door opener arms: the straight and curved sections that connect the opener trolley to the door. We carry arms for LiftMaster, Chamberlain, Genie, Linear, Marantec and Sommer openers, plus LiftMaster commercial arm kits.
Find your brand in the guide below the products.
Door arms by brand
| Brand | Straight / curved arms |
|---|---|
| LiftMaster / Chamberlain | 178B34 straight, 178B35 curved; door bracket 041A5047-1 |
| LiftMaster commercial | K10-10203 curved (medium duty), K10-10371 straight, K75-10214 straight arm kit, K75-12870 complete arm kit |
| Genie | 26012D.S straight, 26013D.S curved, 19792A04 door bracket |
| Linear | 227966 straight, 227967 bent |
| Marantec | 8030735 straight, 8030734 curved, 116213 and 188818 extension arms, 73636 pin |
| Sommer | 40040 straight, 10178 curved |
How the door arm connects (LiftMaster sectional doors)
- Close the door and pull the emergency release handle. Slide the outer trolley back about 2".
- Fasten the straight section to the outer trolley with a 5/16" x 1" clevis pin and ring fastener.
- Fasten the curved section to the door bracket with a 5/16" x 1-1/4" clevis pin and ring fastener.
- Bring the sections together and bolt them at two pairs of holes that line up, as far apart as possible for a rigid arm.
- If the curved arm holes sit above the straight arm holes, LiftMaster says to cut about 6" from the solid end of the straight arm and reconnect it cut end down.
After any change, check the travel limits and test the safety reversal.
Bracket pulled loose from the door? See door brackets and reinforcement brackets. Questions? Call 877-379-4947.
Frequently Asked Questions
Do I need a straight or curved door arm?
Most sectional doors use both: on LiftMaster openers the straight section connects to the trolley and the curved section connects to the door bracket. The two sections bolt together at two pairs of holes. Order the arm for your opener brand, since hole spacing and pins differ.
