Dormakaba RTS88 Overhead Conce...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$646.00
$347.95
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
$347.95

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

$646.00
$347.95
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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" x 3-9/16" x 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) Which spring size do I order on a Dormakaba RTS88, SZ3 or SZ4?
Go by door width and whether the opening is interior or exterior. SZ3 is the standard closing force and covers interior doors 3'-0" to 3'-6" and exterior doors 2'-6" to 3'-0". SZ4 is the strongest force, for interior doors 3'-6" to 4'-0" and exterior doors 3'-0" to 3'-6". An exterior 3'-0" door sits at the top of SZ3 and the bottom of SZ4, so the wind and stack pressure on that entrance decides it. Spring size is picked at order and is part of the part number, as in RTS88105NHOSZ4 for a 105 degree non hold-open unit with the SZ4 spring.
2) How heavy a door will the Dormakaba RTS88 concealed closer handle?
Up to 250 lbs. That covers most aluminum entrances and hollow metal exterior doors, and it is the ceiling for the closer body regardless of which spring you put in it. Weight and spring size are two separate decisions on this unit: the 250 lb figure is the mechanical limit, while SZ3, SZ4, BFI and BFE are selected off door width and interior versus exterior use. A heavy 4'-0" interior door needs the SZ4 spring and still has to come in under 250 lbs.
3) Can the RTS88 be used on a double acting door, and do I have to specify left or right hand?
Handing is not a decision here. The RTS88 is non-handed and installs on a left or right hand door without modification, and it works on single acting and double acting doors. For anyone stocking spares across a building that is the practical benefit: one body covers every swing direction in the facility, and the only things that vary between openings are the cushion stop angle, hold-open, and spring size.
4) What is the difference between the 90 degree and 105 degree Dormakaba RTS88, and can I change it after it is installed?
That number is the positive cushion stop angle, the point where the closer stops the door at full open. It is chosen when you order, not switched in the field, so measure what is beside the opening first: a door that would hit a return wall, a column, or adjacent glass at 105 degrees takes the 90 degree unit, while a corridor or lobby opening with clearance takes 105 for the wider throw. Both angles are offered with hold-open or without, and in all four springs, so the angle choice does not restrict anything else on the order.
5) Aluminum storefront door on offset pivots - what concealed closer suits that opening?
The Norton Rixson 0608 is the offset hung standard duty overhead concealed closer built for aluminum doors up to 200 lbs. Where the door is center hung instead, the Norton Rixson 608 and 700 are the center hung standard duty units at 200 lbs. The Dormakaba RTS88 also installs in aluminum doors and frames, along with wood and hollow metal, is non-handed for left- or right-hand doors, and carries a 250 lb door weight, so it stays in play when the storefront leaf is heavier than the 200 lb units allow.
6) What is the closest body-only overhead concealed closer to the Dormakaba RTS88 for a 105 degree stop with no hold-open?
The RTS88 is built for that opening in its 105 degree cushion, non hold-open configurations, such as RTS88105NHOSZ3 and RTS88105NHOSZ4, and it is non-handed for single or double acting doors up to 250 lbs. The nearest cross-brand equivalents are the CRL Jackson body-only concealed closers: 20-101M-01 is the regular duty body supplied at 105 degrees with a non hold-open function in brown, and 20-101M-09 is the heavy duty body at the same 105 degree non hold-open function. All three ship as a closer body without brackets or arms, so the door and frame prep governs which one drops into the existing pocket.
7) I need the cushion stop at 90 degrees rather than 105 - which concealed closers are set up that way?
The Dormakaba RTS88 is ordered with the positive cushion stop at 90 degrees in builds such as RTS8890NHOSZ3 and RTS8890HOSZ4, covering both standard closing and hold-open at that angle. On the CRL Jackson side, 20-101M-03 is the body-only regular duty concealed closer supplied at 90 degrees with a non hold-open function; the other CRL Jackson bodies - 20-101M-01, 20-101M-09 and 20-101M-17 - are 105 degree units. If a wall return or adjacent partition sets the stop angle, that distinction decides the order.
8) The door has to stand open for deliveries. Which overhead concealed closer should I specify?
Order the Dormakaba RTS88 in a hold-open build - RTS8890HOSZ3 at a 90 degree stop or RTS88105HOSZ4 at 105 degrees, with the same choice of spring size as the standard closing versions. The CRL Jackson body-only closers 20-101M-01, 20-101M-03 and 20-101M-09 are specified as non hold-open, so they return the door on every cycle and would need a separate holder at the opening. Hold-open on the RTS88 is fixed at the time of order rather than added later, so it has to be called out on the purchase.
9) Which overhead concealed closers work on a double acting door that swings both directions?
The Dormakaba RTS88 is non-handed and rated for single or double acting doors up to 250 lbs, in wood, aluminum, or hollow metal construction. The Norton Rixson 73 is the direct cross-brand option for that swing - a center hung double acting overhead concealed closer supplied with a cover plate, heavy duty and Grade 1, also at 250 lbs. The choice usually comes down to the hanging method already in the opening, since the 73 is a center hung unit while the RTS88 is a non-handed body set into the door and frame prep.
10) Is the Sargent 278 a like-for-like swap for the Dormakaba RTS88 where the goal is no visible hardware?
No - the Sargent 278 is an overhead concealed closer with an exposed arm, so hardware remains visible at the head of the door even though the closer body is concealed. The Dormakaba RTS88 keeps the mechanism inside the door with no exposed arm or track and no visible hardware on the door face or frame face, which is why it gets specified at problem entrances and on clean facades. If the reason for going concealed is that the arm and track are the vandalism target, the 278 does not remove that exposure; the Sargent 268, with its cast iron body, and the Sargent 269 are the other heavy duty Grade 1 units in that family.
11) Can I change the closing force after the closer is in the door, or is it fixed at the time of order?
On the Dormakaba RTS88 the spring size is chosen when the unit is ordered - SZ3 for 3'-0" to 3'-6" interior and 2'-6" to 3'-0" exterior doors, SZ4 for 3'-6" to 4'-0" interior and 3'-0" to 3'-6" exterior doors, and BFI or BFE for barrier-free opening force on 3'-0" doors - while latch and sweep speed stay adjustable in the field through the dual-speed control. The CRL Jackson 20-101M-17 is the body-only concealed closer offered with adjustable spring power, at a 105 degree non hold-open function. On a job where the final door width or opening force target is still moving, that difference is worth settling before the prep is cut.
12) Should I order the RTS88 with hold-open or without?
Hold-open is an order-time option on the RTS88, marked HO in the part number against NHO for the standard closing version, and it holds the door open at the cushion stop angle you specified. Order it where staff want the door parked open during deliveries or move-ins. Order the non hold-open version on any door that has to close and latch on its own, including doors in a rated or secured wall. Both are available at 90 and 105 degrees and in all four springs, so RTS88105HOSZ3 and RTS88105NHOSZ3 are the same closer apart from that one function.
13) The door slams shut and gets thrown into the wall. Can the closing speed be adjusted on an RTS88?
Yes, and in two separate ranges. The RTS88 has dual-speed closing control, meaning sweep speed and latch speed are adjusted independently, so you can slow the door through most of its travel and still leave it enough at the last few inches to latch. Backcheck handles the opposite problem, cushioning the door before it reaches full open so wind or a hard push does not drive it into the adjacent wall, and the positive cushion stop at the ordered 90 or 105 degrees is the hard limit on travel.
14) I do not know the door widths yet. Is there a concealed closer body that does not make me pick a spring size up front?
The RTS88 requires the spring called out on the order, SZ3, SZ4, BFI or BFE, chosen off door width and interior versus exterior use. If you would rather set the force on site, the CRL Jackson Adjustable Spring Power Overhead Concealed Door Closer Body Only is the alternative we carry, in a 105 degree no hold-open configuration. Trade-off: that CRL Jackson unit is non hold-open, so if any of those openings need to park open you still want the RTS88 hold-open version for them.
15) I need the door to swing wider than 105 degrees. Will the RTS88 do it?
No. The RTS88 stops the door with a positive cushion stop at the angle you order it with, either 90 or 105 degrees, and there is no wider option in the family. For an opening that has to swing further, the Sargent 269 overhead concealed closer is listed with 180 degree opening capability, heavy duty and Grade 1. Worth checking the stop condition before you order either way, since a concealed closer set to 105 degrees on a door that gets pushed to a wall stop is fighting the building.
16) We keep having closers torn off a problem entrance. Does a concealed closer actually remove that target?
It does when the arm goes with it. The RTS88 sits entirely inside the door and frame with no hardware visible on the door face or frame face and no exposed arm or track, which is what gets pried, hung on, or vandalized on a surface closer. Watch the distinction when you compare, though: the Sargent 278 is an overhead concealed closer with an exposed arm, so the body is hidden but the arm is still out there. If removing the exposed arm is the whole point of the change, that is the detail to check on any replacement.
17) The submittal calls for an ANSI Grade 1 overhead concealed closer. Which units carry that rating?
Four in the comparable group state Grade 1: the Sargent 268 with a cast iron body, the Sargent 269 with 180 degree opening capability, and the Sargent 278 with an exposed arm, all heavy duty Grade 1, plus the Norton Rixson 73, a heavy duty Grade 1 center hung double acting closer with cover plate rated at 250 lbs. Match the rating to the hanging method already in the opening, because the 73 is center hung while the Sargent units differ in arm arrangement and opening arc. For comparison on capacity, the Dormakaba RTS88 also carries a 250 lb door weight and installs in wood, aluminum, or hollow metal doors and frames.
18) For a high-traffic entrance, which concealed closers are the heavy duty ones rather than standard duty?
Among the CRL Jackson body-only units, 20-101M-09 is the heavy duty closer at a 105 degree non hold-open function, while 20-101M-01 at 105 degrees and 20-101M-03 at 90 degrees are the regular duty bodies. The Norton Rixson 73 is heavy duty at 250 lbs, and the Sargent 268, 269 and 278 are heavy duty Grade 1 units; the Norton Rixson 0608, 608 and 700 are standard duty at 200 lbs. The Dormakaba RTS88 covers doors to 250 lbs with backcheck protection at full open and dual-speed latch and sweep control, which is what a door being pushed hard all day tends to need.
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?
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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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