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Dorma J8 ED900 Series Closer Arm, Push Side, Top Jamb Mount, 0" - 8" Reveal
Manufacturer Resources
Product Specs
- Subcategory:
- Door Closer Parts & Accessories
- Product Group:
- Door Controls
- Product Subgroup:
- Parts and Accessories
- Product Type:
- Closer Arms
- Commercial/Residential:
- Commercial
- Duty Level:
- Heavy Duty
- Parts and Accessories Type:
- Replacement Parts
- Product Attribute:
- Parts and Accessories
- Product Function:
- Closer Arm, Push Side
- Product Category:
- Door Controls
- Department:
- Door Hardware
- Product Model:
- J8 689
Dormakaba J8 689 – Frequently Asked Questions
1) What reveal will the Dorma J8 top jamb closer arm work with?
The Dorma J8 arm is built for top jamb mounting with a reveal of 0 to 8 inches, measured from the face of the door to the face of the jamb or soffit where the closer body sits. If your frame reveal falls anywhere in that range, this is the arm for the ED900 Series closer. Beyond 8 inches of reveal, a top jamb arm will not reach correctly and you need a different mounting approach.
2) Is the J8 arm for the push side or the pull side of the door?
Push side. The J8 is a top jamb arm, so the closer body mounts on the frame face above the door on the side the door swings away from, and the arm pushes the door closed. If your closer is mounted on the door leaf on the pull side (regular arm) or in the frame soffit with a track, this is not the right arm.
3) Will the Dorma J8 arm fit any door closer, or only the ED900?
It is an ED900 Series arm. Dorma closer arms are matched to the spindle and pinion of their own closer body, so the J8 should be ordered for an ED900 closer and not used as a universal replacement on another series or another manufacturer's closer.
4) My ED900 closer body is fine but the arm is bent. Do I have to replace the whole closer?
No. The J8 is sold on its own as a replacement arm for the ED900 Series, so a bent or damaged arm can be swapped without pulling the closer body off the frame. Order it in 689 anodized aluminum to match the existing unit, and keep the mounting to top jamb, push side with a 0 to 8 inch reveal.
5) Is this arm rated for a high-traffic commercial opening?
Yes. The J8 is classed heavy duty and commercial, so it is intended for entrances and corridor doors that cycle constantly, not light residential use. It is sold as a replacement part, so it is the component you order when the original arm on an ED900 is bent, worn at the elbow, or sheared after an impact.
6) Does the J8 arm have a hold-open feature?
The J8 is a standard non-hold-open push side arm for top jamb installation on the ED900. If the opening needs the door to stand open at a set degree, you need a hold-open arm variant rather than this one.
How fast can I get the Dormakaba J8 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 J8 689 come with a warranty?
Absolutely. The Dormakaba J8 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 J8 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 J8 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.