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What is the minimum top door rail depth required for installing this arm set?

Windows and Door Hardware
Door Closers and Accessories
Dorma® Overhead Concealed Door Closers and Accessories
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DK Hardware 2026-09-29 - 21:25:21
Technical Team

The DORMA RTS8812 Kaba Top Offset Slide Arm Set requires a minimum 3/4" (19 mm) top door rail channel depth for proper installation. This ensures the mortise type deep slide-track fits correctly.

Product Details

Kaba Top Offset Slide Arm Set Rts88, Mortise Type Deep, Non Handed, Aluminum And Hollow Metal Door Compatibility
RTS8812DORMA RTS8812 Kaba Top Offset Slide Arm Set Rts88, Mortise Type Deep, Non Handed, Aluminum And Hollow Metal Door Compatibility
$135.29/Each

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