BEST SIS Surface Closer Arm wi...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$573.00
$326.76
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BEST SIS Surface Closer Arm with Spring Cushion and Bumper, Regular or Top Jamb Mount, 0" to 3-1/2" Reveal

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Model: SIS 689

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

$573.00
$326.76
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BEST SIS Surface Closer Arm with Spring Cushion and Bumper, Regular or Top Jamb Mount, 0" to 3-1/2" Reveal

The BEST SIS Surface Closer Arm is a commercial-grade replacement door closer arm designed to accommodate regular or top jamb mount configurations with a reveal range of 0" to 3-1/2". Complete with a spring cushion assembly and integrated bumper, this arm provides controlled door movement and reliable performance for demanding commercial applications. Engineered as a direct replacement part compatible with the BEST SIS door closer series, it delivers the precision and durability required for high-traffic institutional environments.

Key Features

  • Reveal Range: Accommodates 0" to 3-1/2" reveal dimensions, providing installation flexibility across a variety of door frame configurations.
  • Versatile Mounting Options: Supports both regular arm and top jamb mount installations to suit a wide range of commercial door applications.
  • Spring Cushion Assembly: Complete spring cushion mechanism included for smooth, controlled door swing and reduced impact during operation.
  • Integrated Bumper: Built-in bumper protects door and frame surfaces from damage during repeated use in high-traffic settings.
  • Commercial-Grade Construction: Engineered to commercial standards for durability and long-term reliability in demanding environments.
  • Direct Replacement Part: Designed as a factory-compatible replacement for the BEST SIS surface closer series, simplifying maintenance and service.
  • Complete Assembly: Supplied as a complete arm assembly, reducing installation complexity and minimizing downtime during replacement.

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: SIS

Typical Applications

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

Why BEST SIS?

BEST door closer components are built to commercial standards, delivering dependable performance in high-traffic environments where consistent, controlled door operation is critical. The SIS surface closer arm's complete spring cushion assembly and integrated bumper make it an efficient, ready-to-install replacement that minimizes service time and maintains the performance integrity of the original closer system.

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:
SIS
Features:
Dorma Door Closer Parts & Accessories

BEST SIS 689 – Frequently Asked Questions

1) What reveal can the BEST SIS closer arm handle on a top jamb mount?
The SIS surface closer arm covers a reveal range of 0 inches to 3-1/2 inches, and it works in either regular arm or top jamb mount. That range covers most commercial frames where the stop face sits back from the door face, so you don't need a separate drop plate to pick up a deep reveal within 3-1/2 inches.
2) Will this arm fit a closer other than a BEST SIS?
It is sold as a direct replacement for the BEST SIS surface closer series. The pinion spline and arm geometry are specific to that closer body, so match the closer you have before ordering. If the body on your door is a different series, the SIS arm is the wrong part for it.
3) I have a parallel arm closer installation. Can I use the BEST SIS spring cushion arm?
No. This arm is built for regular arm and top jamb mount only. A parallel arm application, where the closer sits on the push side with the arm running back along the frame face, needs a parallel arm assembly instead. Confirm which side of the door the closer body sits on before you order.
4) Is the spring cushion arm on the BEST SIS a stop for the door, or do I still need a wall stop?
The spring cushion arm includes a built-in bumper that absorbs the door at the end of the swing and protects the door and frame from repeated impact. It cushions, it is not a substitute for a floor or wall stop where one is called for. On high traffic openings in schools and hospitals, keep the stop and let the cushion arm take the everyday abuse.
5) Does the BEST SIS arm come as a complete assembly or do I have to order the shoe and forearm separately?
It ships as a complete arm assembly, including the spring cushion mechanism and the bumper. For a maintenance tech that means one part number swaps the whole arm out without sourcing the forearm, shoe and cushion pieces individually.
6) What finish does the BEST SIS closer arm come in?
One finish: 689 aluminum painted. That is the standard commercial closer finish, so it will blend with existing 689 closer bodies and arms already on your openings. If your building is standardized on a plated or dark bronze closer finish, this arm will not match visually even though it fits.
7) Is this closer arm rated for commercial use or is it a light duty residential part?
Commercial. The SIS arm is a commercial-grade replacement part built for high traffic institutional openings, office buildings, schools, healthcare, government buildings, retail and multi-tenant residential corridors. It is not a light duty residential closer component.
How fast can I get the BEST SIS 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 BEST SIS 689 come with a warranty?
Absolutely. The BEST SIS 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 BEST SIS 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 BEST SIS 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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