Overhead Concealed Door Closer Arm & Track | For 7/8" Deep Top Rails | Commercial Door Hardware

Restore smooth operation to a compatible overhead concealed door closer with the Prime Door Controls Offset Arm with 7/8" Track.

Designed for commercial OHC installations using a 7/8" deep top rail, this assembly combines an offset closer arm with a sliding track to transfer the motion of the overhead concealed closer to the door.

It is an excellent replacement for worn, bent, damaged, or missing arm-and-track components on compatible aluminum storefront and commercial door systems.

Key Features

• Prime Door Controls commercial closer accessory

• Offset arm with slide track

• Designed for 7/8" deep top rails

• Used with compatible overhead concealed door closers

• Smooth sliding-track operation

• Helps transfer closer motion to the door

• Ideal for aluminum storefront doors

• Suitable for compatible hollow metal applications

• Commercial-duty replacement hardware

• Excellent for repair and retrofit work

• Arm and track assembly

• Current CDW SKU: 5000-OS-7/8 (SHORT)

7/8" Deep Rail Application

This arm-and-track configuration is designed for doors with approximately:

7/8" Deep Top Rail

The 7/8" dimension refers to the top-rail depth required for the compatible track installation—not the width or thickness of the complete door.

Commercial overhead concealed closer catalogs commonly identify this configuration as:

Offset Arm with Track for 7/8" Deep Rails.

Offset Arm Design

The offset arm connects the concealed closer spindle to the track installed in the top rail of the door.

As the door opens and closes:

1. The closer rotates the offset arm.

2. The arm moves the sliding block through the track.

3. The track guides the arm through the door swing.

4. The concealed closer controls closing and latching action.

This design keeps the primary closer body concealed above the door while allowing controlled door movement.

Commercial Storefront Application

Offset arm-and-track assemblies are commonly used with:

• Aluminum storefront doors

• Center-hung commercial doors

• Overhead concealed closer systems

• Glass-and-aluminum entrances

• Retail storefront doors

• Office building entrances

• Commercial aluminum door systems

Product Specifications

Brand: Prime Door Controls
Product Type: Offset Arm & Track Assembly
Application: Overhead Concealed Door Closer
Track Requirement: 7/8" Deep Top Rail
Arm Type: Offset
Track Type: Sliding Track
Current CDW SKU: 5000-OS-7/8 (SHORT)
Application: Commercial / Storefront Doors
Use: Replacement / Repair / Retrofit

Replacement Applications

Use this arm and track assembly when the existing hardware is:

• Bent

• Broken

• Worn

• Binding

• Missing

• Producing rough door movement

• No longer tracking correctly

• Being replaced during closer service

The closer body, pivot hardware, and door alignment should also be inspected whenever arm or track damage is present.

Common Applications

Ideal for:

• Retail storefronts

• Shopping centers

• Office buildings

• Restaurants

• Schools

• Universities

• Hospitals

• Healthcare facilities

• Government buildings

• Commercial entrances

• Institutional facilities

• Aluminum entrance doors

Important Compatibility Note

Overhead concealed closer arms are available in several configurations.

Common differences include:

• 7/8" deep rail

• 5/8" deep rail

• Side-load arms

• End-load arms

• K-type arms

• Offset arms

• Closer spindle configuration

• Track length and preparation

Before ordering, verify:

• Existing closer model

• Top-rail depth

• Existing arm type

• Track preparation

• Door handing

• Spindle connection

• Existing mounting-hole pattern

A 7/8" offset arm should not automatically be substituted for a 5/8" version.

7/8" vs. 5/8" Offset Arms

7/8" Offset Arm

Designed for compatible doors with a 7/8" deep top rail.

5/8" Offset Arm

Designed for compatible doors with a shallower 5/8" top rail.

Always measure the existing door rail and compare the original hardware before ordering.

Installation Notes

Before installation:

• Inspect the closer spindle

• Check the slide track for proper alignment

• Verify the door is centered correctly

• Inspect the bottom pivot

• Confirm door clearance

• Check that the track is securely fastened

Improper alignment can cause excessive wear on the arm, track, closer spindle, and pivots.

What's Included

(1) Prime Offset Arm
(1) Compatible 7/8" Track

Associated mounting or slide components should be confirmed according to the selected package.