Dormakaba RTS88 Overhead Conce...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$646.00
$372.27
Dormakaba Dorma RTS88 Series Overhead Concealed Door Closer Body Only — angled view showing closer body and spindle arm assembly

Dormakaba RTS88 Overhead Concealed Door Closer Body Only

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Model: RTS88-105-HO-SZ3
$646.00
$372.27

In Stock (leaves warehouse same day if ordered before 3pm ET)

$646.00
$372.27
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Dormakaba RTS88 Overhead Concealed Door Closer — Body Only

The RTS88 is engineered for installations where surface-applied closers are unsuitable or would compromise the architectural design. Fully concealed within the door and frame, it delivers lasting, dependable performance on single and double-acting doors in wood, aluminum, or hollow metal construction — with no exposed hardware to vandalize or tamper with.

Non-handed and field-configurable, the RTS88 ships as a body-only unit. Select your cushion stop angle (90° or 105°), hold-open or standard closing, and the spring size matched to your door width and application.

Key Features

  • Fully concealed overhead installation — no visible hardware on door face or frame face
  • Non-handed: installs on left- or right-hand doors without modification
  • Single and double-acting door compatibility
  • Dual-speed closing control (separate latch and sweep speed adjustment)
  • Backcheck protection to prevent door damage at full open
  • Positive cushion stop at 90° or 105° (selected at order)
  • Hold-open option available (selected at order)
  • Vandalism-resistant: mechanism concealed inside door — no exposed arm or track
  • Less on-site machining: door and frame prep completed before unit installation

Specifications

  • Maximum door weight: 250 lbs
  • Body dimensions: 12-11/16" × 3-9/16" × 2-7/32"
  • Compatible substrates: Wood, aluminum, or hollow metal doors and frames
  • Door swing: Single or double acting
  • Handed: Non-handed

Spring Size Selection Guide

  • SZ3 — Standard closing force: Interior doors 3'-0" to 3'-6"; exterior doors 2'-6" to 3'-0"
  • SZ4 — Strongest closing force: Interior doors 3'-6" to 4'-0"; exterior doors 3'-0" to 3'-6"
  • BFI — Barrier-free light opening force: Interior doors, 3'-0" door width (ADA/accessibility applications)
  • BFE — Barrier-free light opening force: Exterior doors, 3'-0" door width (ADA/accessibility applications)

Why Specify the RTS88

Aesthetic advantage: Architects and designers specify the RTS88 where a surface-applied closer would interrupt a clean facade — hospitality lobbies, healthcare corridors, institutional entries, and high-end commercial interiors.

Vandalism resistance: The concealed mechanism eliminates the exposed arm and track that are the primary vandalism targets on surface closers — making the RTS88 the preferred replacement at problem entrances.

Contractor-friendly installation: Door and frame mortising is completed before the unit is set, reducing on-site machining time and simplifying coordination with other trades.

This listing is for the closer body only. Mounting brackets and arms are sold separately. Confirm door and frame prep requirements against the Dormakaba RTS88 installation template before ordering.

Manufacturer Resources

Product Specs

Product Group:
Door Controls
Series:
RTS Series
Product Subgroup:
Door Closers - Overhead Concealed
Product Type:
Overhead Concealed Door Closers
Subcategory:
Concealed Door Closers
Door Weight:
250 lbs
Door Swing:
Single or Double Acting
Commercial/Residential:
Commercial
Mounting Detail:
Wood, aluminum, or hollow metal doors and frames
Product Model:
RTS88
Door Hand Direction:
Non-Handed
Product Dimension:
12-11/16" x 3-9/16" x 2-7/32"
Product Category:
Door Controls
Department:
Door Hardware

Dormakaba RTS88-105-HO-SZ3 – Frequently Asked Questions

1) What is the DORMA RTS88 series overhead concealed closer designed for?
The RTS88 is a heavy-duty overhead concealed door closer for interior and exterior applications. It provides controlled closing and latching for doors up to specific weight and width limits. The concealed design offers clean aesthetics while maintaining professional-grade performance.
2) What door sizes and weights is this closer compatible with?
Verify specific door width and weight capacities with manufacturer specifications. Most RTS88 models handle standard commercial door sizes. Check your door dimensions against the closer's rated capacity before installation to ensure proper operation and longevity.
3) Can this closer be used for both left and right hand doors?
Most RTS88 closers are reversible for left or right hand applications. Confirm handing requirements during ordering. Some models may require specific arm configurations for different door swings.
4) What finishes are available for the RTS88 series?
DORMA typically offers standard architectural finishes. Check available finish options when ordering as inventory may vary. Consider matching existing door hardware finishes for consistent appearance.
5) What power rating does this closer provide?
The RTS88 series provides specific power ratings suitable for its intended applications. Verify the exact power grade meets your door requirements and local building codes. Higher power ratings handle heavier doors and adverse conditions.
6) Does this closer meet ADA and building code requirements?
Most DORMA commercial closers are designed to meet ADA opening force requirements when properly adjusted. Verify compliance with local building codes and accessibility standards. Proper installation and adjustment are critical for code compliance.
7) What parts and accessories are needed for complete installation?
This listing is for the closer body only. You'll need appropriate arms, mounting plates, and hardware for your specific application. Check the complete parts list and verify all components are available before starting installation.
8) What are the basic installation requirements?
Installation requires precise door and frame preparation according to manufacturer templates. The concealed design demands accurate mortising. Professional installation is recommended for proper fit and operation. Follow all template dimensions exactly.
9) How do you adjust closing speed and latching on this closer?
The RTS88 typically features adjustable closing speed and latching speed valves. Use appropriate adjustment tools and make small incremental changes. Refer to manufacturer instructions for valve locations and adjustment procedures.
10) What other DORMA closer models are similar to the RTS88?
Browse our door closers section for alternative DORMA models. Consider surface-mounted options if concealed installation isn't required. Compare power ratings and features to find the best match for your application.
11) Can this closer handle high wind loads and weather exposure?
Check the closer's wind load rating for exterior applications. High-traffic or weather-exposed doors may require additional features or higher power ratings. Consider field conditions when selecting closer specifications.
12) What measurements are critical for proper installation?
Key measurements include door thickness, frame depth, and clearance dimensions. Use manufacturer templates for exact mortise dimensions. Verify adequate space for arm operation and closer body installation before beginning work.
How fast can I get the Dormakaba RTS88-105-HO-SZ3 delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Dormakaba RTS88-105-HO-SZ3 come with a warranty?
Absolutely. The Dormakaba RTS88-105-HO-SZ3 is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Dormakaba RTS88-105-HO-SZ3?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
Why buy the Dormakaba RTS88-105-HO-SZ3 from ZenSupply?
ZenSupply makes it easy to get the commercial door hardware you need—fast shipping, expert support, and rewards on every order. Our team is always ready to help you choose the right product for your project.

Product Reviews

  • 4
    Great Door Closer for a Secure Entry

    Posted by Bentley on Sep 21st 2023

    I purchased the Dorma RTS88 Series door closer, and it's impressive. The concealed design is sleek, blending well with the door. It ensures a smooth and quiet closure, enhancing security. However, installation can be challenging for beginners. Overall, it's a top-notch choice for those seeking durability and aesthetics.

  • 5
    A Closer Look at the Dorma RTS88 Series Door Closer

    Posted by Emily on Oct 11th 2023

    I snagged the Dorma RTS88 door closer from zensupply.com. What I love is the smooth and silent operation - no more slamming doors! But hey, installation's a bit tricky, and the price might pinch your wallet. Still, it's a solid choice for quieter entrances.

  • 5
    Sleek and Reliable Door Closer

    Posted by Kate on Oct 2nd 2023

    I got the Dorma RTS88 Series Overhead Concealed Door Closer from Zensupply, and it's sleek and reliable. The concealed design gives my door a clean look, and it works like a charm. Only hiccup - the installation instructions could be clearer, so be prepared for a bit of head-scratching. Overall, a solid choice for a modern, polished finish.

  • 5
    A Solid Door Closer Solution

    Posted by Tommy on Sep 15th 2023

    I recently purchased the Dorma RTS88 Series Overhead Concealed Door Closer from zensupply.com, and I'm impressed. The easy installation was a breeze, and it keeps my door securely closed. It's super reliable. The only drawback is that it's a bit on the pricey side, but the quality justifies the cost. Overall, a smart choice for any door closer needs.

  • 5
    Sleek Door Closer Solution

    Posted by Walter on Aug 28th 2023

    Tried the DORMA RTS88 Series Overhead Concealed Door Closer from ZenSupply. Love how it keeps my doors closing smoothly and quietly. Installation was a bit trickier than expected, especially with the brackets. Once set up, though, it's been working like a charm. Solid choice for a clean look and reliable function.

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