dormakaba GR-3500 Hold-Open Block for G-N Sliding Rail Retrofit 75?150° Adjustable

Product Overview

In door hardware installations using the dormakaba TS 91, TS 92, TS 93, or GROOM GR-3500 door closers, the RF Hold-Open Block (GR-3500, 00018570000) enables secure door hold at a selectable position between 75 and 150 degrees. This auxiliary device attaches to the standard sliding rail G-N and is suitable for both left- and right-handed single-leaf doors in interior settings where temporary access is required but fire or smoke containment is not a concern.

A key differentiator for this SKU is its easy retrofitting capability?installers can add the RF Hold-Open Block to an existing sliding rail G-N without replacing the closer or rail assembly. This reduces the complexity and cost of upgrades in commercial facilities, hospitality venues, and office fit-outs needing occasional door hold. Ideal for refurbishment projects or bulk specification where flexibility in door function is required.

Key Features

• Selectable hold-open angle ? adjustable range from 75° to 150° to suit various access requirements


• Easy retrofit installation ? mounts directly onto existing G-N sliding rail without replacing main hardware


• DIN left and right compatibility ? suitable for both door orientations, simplifies procurement


• Manual activation ? hold function can be easily engaged or disengaged by user


• Force adjustment ? hold strength can be tuned for different door weights


• Suitable for single-leaf doors ? designed specifically for interior, non-fire-rated doors


• Screw mounting ? secure installation via direct fixing for stability

Technical Specifications

• Compatible Door Closers: dormakaba TS 91, TS 92, TS 93, GROOM GR-3500


• Sliding Rail Compatibility: G-N Standard


• Hold-Open Angle Range: 75° to 150°


• Mounting: Screw-on, for retrofit


• Door Orientation: DIN left and DIN right


• Applicable Door Type: Single-leaf, non-fire door


• Product Number: 185700

Applications

Used in commercial and office interiors, hospitality spaces, and refurbishment projects where temporary door hold is needed. Compatible with dormakaba TS 91, TS 92, TS 93, and GROOM GR-3500 closers on single-leaf doors. Not suitable for fire-rated or smoke-control doors. Facilitates easy upgrades or maintenance without major hardware changes.

Packaging & Shipping

Standard export packaging. Unit includes the RF hold-open block, mounting hardware, and installation instructions.