Dormakaba MOD SDST Modular Doo...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$489.00
$283.38
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Dormakaba MOD SDST Modular Door Closer Arm, Extra Heavy-Duty Door Saver Spring Cushion with Thumb Turn Hold Open, Parallel

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Model: MOD SDST 689

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

$489.00
$283.38
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Dormakaba MOD SDST Modular Door Closer Arm, Extra Heavy-Duty Door Saver Spring Cushion with Thumb Turn Hold Open, Parallel

The Dormakaba MOD SDST is a commercial-grade modular door closer arm engineered for demanding applications that require superior protection and controlled hold-open functionality. This parallel-mount arm features an extra heavy-duty door saver spring cushion that absorbs impact and reduces stress on the door, frame, and closer body, significantly extending the service life of the entire door assembly. A built-in thumb turn hold-open mechanism allows convenient manual hold-open positioning without additional hardware. Designed as part of the Dormakaba modular closer arm system, the MOD SDST is a genuine replacement part and accessory compatible with Dormakaba door closer platforms.

Key Features

  • Extra Heavy-Duty Door Saver Spring Cushion: Absorbs door impact and reduces stress transferred to the closer body, door, and frame for extended service life in high-traffic commercial environments.
  • Thumb Turn Hold Open: Integrated thumb turn mechanism allows convenient manual hold-open positioning, eliminating the need for separate hold-open accessories.
  • Parallel Arm Configuration: Parallel mounting geometry provides a clean, low-profile appearance suited for applications where standard overhead arm projection is undesirable.
  • Modular Closer Arm Design: Part of the Dormakaba MOD modular arm system, enabling straightforward replacement and compatibility with Dormakaba closer platforms.
  • Commercial-Grade Construction: Built to withstand the rigors of heavy commercial use, providing reliable performance across a wide range of door closer applications.
  • Genuine Replacement Part: Authentic Dormakaba part and accessory, ensuring proper fit, function, and manufacturer-level quality for maintenance and service applications.

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 Arms
  • Parts and Accessories Type: Replacement Parts
  • Commercial/Residential: Commercial
  • Product Model: MOD SDST
  • Features: Dorma Door Closer Parts & Accessories

Typical Applications

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

Why Dormakaba MOD SDST?

Dormakaba MOD SDST door closer arm products deliver professional-grade reliability through an extra heavy-duty door saver spring cushion design that protects door assemblies from repeated impact stress in high-traffic commercial settings. The integrated thumb turn hold-open feature and parallel arm configuration reflect Dormakaba's commitment to functional versatility, making the MOD SDST a trusted choice for facility managers and door hardware professionals requiring genuine, high-quality replacement components.

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 Arms
Parts and Accessories Type:
Replacement Parts
Commercial/Residential:
Commercial
Product Model:
MOD SDST
Features:
Dorma Door Closer Parts & Accessories

Dormakaba MOD SDST 689 – Frequently Asked Questions

1) What does the SDST designation on a Dormakaba MOD closer arm actually mean?
On the Dormakaba MOD SDST, the arm combines two things: an extra heavy-duty door saver spring cushion that absorbs the door's impact at the end of the swing, and a thumb turn hold-open you set by hand. It is a parallel arm, so it mounts on the push side with the arm running back along the face of the door rather than projecting out overhead.
2) Do I need a separate hold-open device if I use the MOD SDST arm?
No. The hold-open is built into the arm as a thumb turn you rotate to set the door open, so you are not adding a separate hold-open accessory or a friction stop on top of it.
3) Will a spring cushion arm protect a door that keeps getting slammed open into the wall?
That is what the door saver spring cushion is for. It absorbs the impact of an over-swung door and keeps that shock from being driven back into the closer body, the door, and the frame, which is the usual failure path on high-traffic openings like school corridors, retail entries, and warehouse doors. It is not a substitute for a floor or wall stop where one is required, but it takes the abuse off the closer.
4) Can I swap just the arm instead of replacing the whole door closer?
Yes, that is the point of the MOD modular arm system. If the closer body is sound but the arm is bent, the cushion is shot, or you now want a hold-open on that opening, you replace the arm assembly and keep the closer. Match the finish code to the rest of the hardware while you are at it.
5) Is the MOD SDST arm a genuine Dormakaba part or an aftermarket copy?
It is a genuine Dormakaba component, sold as a replacement part within the MOD modular closer arm system and compatible with Dormakaba closer platforms. For a maintenance shop standardizing on Dorma closers, that matters because the arm has to index correctly to the closer's pinion.
6) What finishes does the Dormakaba MOD SDST closer arm come in?
Four: 689 aluminum, 690 dark bronze, 693 black, and 695 dark bronze. If you are matching existing closers across a building, 689 is the common painted aluminum used with most stock commercial closers, and both 690 and 695 read as dark bronze, so pull the code off the closer you are matching rather than going by the color name.
7) Should I use a parallel arm or a regular arm on my closer?
Parallel is the choice when the closer mounts on the push side of the door and you want the arm tucked back against the door face instead of standing out into the opening, which matters in corridors and where the arm would otherwise be grabbed or struck. A standard regular arm mounts on the pull side and projects overhead. The MOD SDST is the parallel configuration, so it is intended for push-side, low-profile installations.
8) Is this closer arm suitable for a residential door?
It is built and catalogued as a commercial component, aimed at office buildings, schools, healthcare, retail, industrial facilities, multi-tenant residential, and government buildings. On a single-family interior door it is more arm than the opening needs.
How fast can I get the Dormakaba MOD SDST 689 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 MOD SDST 689 come with a warranty?
Absolutely. The Dormakaba MOD SDST 689 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 MOD SDST 689?
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 MOD SDST 689 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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