Dormakaba RTS88 Non-Hold Open ...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$711.00
$459.95
Dormakaba RTS88 Non-Hold Open Overhead Concealed Closer Body Only, Size 3, with Degree Bumper and 5mm Extended Spindle

Dormakaba RTS88 Non-Hold Open Overhead Concealed Closer Body Only, Size 3, with Degree Bumper and 5mm Extended Spindle

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Model: RTS88 105 NHO SZ3 5MM

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

$711.00
$459.95
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Dormakaba RTS88 Non-Hold Open Overhead Concealed Closer Body Only, Size 3, with Degree Bumper and 5mm Extended Spindle

The Dormakaba RTS88 105 NHO SZ3 5MM is a commercial-grade Non-Hold Open Overhead Concealed Closer Body Only, engineered for Size 3 applications and featuring a degree bumper alongside a 5mm extended spindle for precise, reliable door control. Designed as a direct replacement component within the Dormakaba RTS88 door closer family, this closer body delivers consistent performance in demanding commercial environments where overhead concealed installation is required. The 5mm extended spindle accommodates specific door and frame configurations, ensuring proper engagement and smooth operation without a hold-open function.

Key Features

  • Non-Hold Open (NHO) Configuration: Designed for applications where doors must return to the closed position automatically, supporting code-compliant egress and security requirements.
  • Size 3 Closer Body: Sized for commercial door applications requiring a Size 3 overhead concealed closer, providing appropriate closing force for the intended door weight and width.
  • 5mm Extended Spindle: Includes a 5mm extended spindle to accommodate specific frame depths and door hardware configurations for proper fitment and operation.
  • Degree Bumper Included: Integrated degree bumper controls and limits door swing, protecting walls, adjacent hardware, and door frames from impact damage.
  • Overhead Concealed Design: Concealed installation within the door or frame keeps the closer mechanism hidden from view, preserving architectural aesthetics in commercial interiors.
  • Body Only Component: Supplied as the closer body only, allowing targeted replacement of the core mechanism within the existing RTS88 system without full assembly replacement.
  • Commercial-Grade Construction: Built to Dormakaba's standards for commercial door closer parts and accessories, suitable for high-traffic institutional and commercial settings.

Technical Specifications

  • Department: Door Hardware
  • Product Category: Mechanical Locks
  • Product Group: Parts and Accessories
  • Subcategory: Parts and Accessories
  • Product Subgroup: Parts and Accessories
  • Product Type: Door Closer Parts
  • Parts and Accessories Type: Replacement Parts
  • Commercial/Residential: Commercial
  • Product Model: RTS88 105 NHO SZ3 5MM
  • Features: Dorma Door Closer Parts & Accessories

Typical Applications

  • Commercial Office Buildings
  • Educational Facilities
  • Healthcare Institutions
  • Government and Municipal Buildings
  • Multi-Tenant Residential Properties
  • Retail Establishments
  • Industrial and Warehouse Facilities

Why Dormakaba RTS88?

Dormakaba RTS88 door closer components are engineered to maintain the performance integrity of professionally installed overhead concealed door control systems. This replacement closer body is manufactured to Dormakaba's commercial-grade standards, ensuring reliable Non-Hold Open operation and compatibility with existing RTS88 installations. For facilities management teams and door hardware professionals seeking a targeted, high-quality replacement part, the RTS88 105 NHO SZ3 5MM delivers dependable, consistent performance in demanding commercial applications.

Manufacturer Resources

Product Specs

Department:
Door Hardware
Product Category:
Mechanical Locks
Product Group:
Parts and Accessories
Subcategory:
Parts and Accessories
Product Subgroup:
Parts and Accessories
Product Type:
Door Closer Parts
Parts and Accessories Type:
Replacement Parts
Commercial/Residential:
Commercial
Product Model:
RTS88 105 NHO SZ3 5MM
Features:
Dorma Door Closer Parts & Accessories

Dormakaba RTS88 105 NHO SZ3 5MM – Frequently Asked Questions

1) Does the Dormakaba RTS88 closer come as a complete closer or just the body?
Body only. The RTS88 105 NHO SZ3 5MM is the core closer mechanism, sold as a replacement part so you can swap the working guts inside an existing RTS88 overhead concealed installation without pulling the whole assembly. If your cement case, arm, or top pivot is damaged, those are separate parts, not part of this order.
2) What degree and size options are there for the RTS88 concealed closer body?
Four combinations: 90 degree or 105 degree stop, each in Size 3 or Size 4. The degree figure is the swing limit set by the degree bumper, and the size is the closing power (Size 3 for lighter/narrower commercial doors, Size 4 for heavier or wider leaves). Match both to what came out of the header, since a Size 4 body on a door specified for Size 3 will close harder than intended.
3) What does the 5mm extended spindle on the RTS88 closer body do, and when do I need it?
The extended spindle adds 5mm of reach at the top pivot so the closer engages the door properly when the frame depth or header/door hardware stack puts the door face further from the closer than standard. It is a fitment dimension, not a performance option. Pull your old body and check the spindle projection before ordering, because a standard spindle where a 5mm extension is needed will not seat in the door top plate.
4) I need a hold-open concealed closer instead. Is this the right part?
No. This is the NHO (non-hold-open) version of the RTS88 body, and the hold-open feature is built into the closer body itself, not added later. If the door needs to stay open at a set point, order the hold-open RTS88 body in the matching size and degree instead of this one.
5) Will the RTS88 non-hold-open closer work on a fire door or a rated egress opening?
Non-hold-open is the configuration you want where the door has to self-close and latch every time, which is the requirement on egress and security openings. The RTS88 NHO body has no hold-open function at all, so nothing can park the door open. Specific ratings for your opening come from the door and frame assembly and the full closer package, so confirm the complete assembly listing with your AHJ.
6) Can I use the RTS88 closer body on a surface-mounted door closer application?
No. The RTS88 is an overhead concealed closer, meaning the mechanism sits inside the door or the header frame out of sight. If your opening has a closer bolted to the face of the door or the frame soffit, you need a surface closer, not this body.
7) Do I need the degree bumper separately with the RTS88 body?
No, the degree bumper is included with the closer body and it is what stops the leaf at the rated 90 or 105 degrees, protecting the wall, the frame, and any adjacent hardware from the door swinging past its limit.
8) Is the RTS88 closer body suitable for a high-traffic commercial entrance?
It is a commercial-grade part, built for high-traffic institutional and commercial use, and it is not a residential closer. Typical placements are office buildings, schools, healthcare, government buildings, retail, multi-tenant residential, and industrial facilities.
How fast can I get the Dormakaba RTS88 105 NHO SZ3 5MM 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 NHO SZ3 5MM come with a warranty?
Absolutely. The Dormakaba RTS88 105 NHO SZ3 5MM 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 NHO SZ3 5MM?
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 NHO SZ3 5MM 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.
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