The Adams Rite 4200 Series eLatch is an electrified narrowstile aluminum door lock containing a latch bolt with auxiliary bolt designed to electronically and/or mechanically control access while working within standard MS door prep. The 4200 Series is ANSI/BHMA Type E8231 (Grade 1) lock that is equipped with a 5/8” by 1” by 5/8” throw latch bolt manufactured of chrome-plated brass. The metal auxiliary bolt prevents “loiding,” unauthorized entry by shimming the latch bolt.

Unlike the conventional latch bolt mechanism, the 4200 Series eLatch is equipped with a pivoting spring-loaded latch bolt. This latch bolt is constructed of three pieces: a triangular shaped latch bolt, the latch carrier, and a connecting pin. The pin not only attaches the latch bolt to the latch carrier, but also enables the latch bolt to pivot. This pivoting action permits the latch bolt to retract and collapse into the lock body as the door is opened.
When the AR 4200 Series eLatch is operated using the paddle handle, a key or electronically to unlock the locking mechanism, the latch bolt does not function conventionally by retracting into the lock case.
The unlocking operation frees the latch bolt to pivot, not retract. As the door begins to open, the latch bolt pivots, changing the angle of operation against the strike’s outer edge from parallel to an approximate 45-degree angle. As the door continues to open, a portion of the latch bolt slides into the lock case until the latch bolt no longer contacts the strike. With the latch bolt no longer contacting the strike, the door continues to open. The operation of the eLatch is roughly the reverse operation of a latch bolt as a door is closing.

Note: The 4200 Series eLatch offers free egress using the paddle handle or similar device.
The 4200 Series eLatch is a Fail-Secure lock operating on 12 or 24VDC. It is rated for continuous duty, permitting the lock to remain powered for timed applications. To ensure the door is closed, locked and secured, the eLatch Lock is equipped with a form “C” latch status monitor standard.
Important: When power is lost, the Fail-Secure lock remains locked.
The case of the eLatch is 15/26” wide by 5-13/16” tall by 1-3/16” deep having a 1-1/8” backset. The case is manufactured of steel with corrosion-resistant plating. Stile preparation uses the same dimensions as the Adams Rite MS1850A and the MS1850 S Series. This allows easy retrofit to obtain electronic access control.

For this article, we will install the Adams Rite 4200 Series eLatch Lock, a 4591MA Deadlatch Paddle, an Adams Rite 4580 Cam Plug and a SARGENT mortise cylinder into a radiused aluminum narrowstile. In addition to a radius type of stile, narrow aluminum door stiles are available flat and beveled. To accommodate the 4200 Series eLatch Lock, the stile must be a minimum of 1-3/4” thick.

The Adams Rite Deadlatch Paddle is available in four configurations: left hand, right hand, push or pull. The handle is field-convertible to the four configurations. The only variation is when ordered, the pull handles are not equipped with dogging. The 4580 Cam Plug is handed and can be reversed in the field by removing the retainer clip and reversing the cam.

The Adams Rite 4591MA Deadlatch Paddle is equipped the latch driver mechanism that can mechanically release the 4200 Series eLatch Lock latching mechanism. The 4580 Cam Plug connects the paddle to the 4200 Series eLatch Lock. For this installation, when the paddle is pressed, the latch driver mechanism rotates the Cam Plug hub, causing the cam to release the latch bolt in the 4200 Lock. The 4591MA Deadlatch Paddle has a switch that can be wired to make or break a low voltage circuit for monitoring purposes. Monitor Switch Kit, part number 91-0914 adds monitor switch function to any 4591 paddle.

To properly operate the latch release mechanism, the mortise cylinder is equipped with an Adams Rite MS® cam. The MS cam is 0.80” tall and 0.182” wide. To mechanically release the latch bolt, using a key or the paddle handle, the mortise lock cylinder or the cam plug cam must rotate the armature to the stop position and keep it in the rotated position.

To simplify the stile preparation, we used the Major Manufacturing HIT-45 Clamp, a HIT-45AR1 Face Plate Template, a HIT-45AR2 Cylinder/Indicator Template and a HIT-45AR4 31/32” or 1-1/8” Cylinder with Holes for Paddle. To route the openings, we used a Porter Cable 691 D Handle router, a HIT-45RB4 1/4” diameter single flute down shear bit and an HIT-45TG5 3/8” outside diameter template guide.

Note: Since there was no indicator installed, the HIT-45AR4 could be used in place of the HIT-45AR2. However, this would require installing the HIT-45AR4 template, routing and drilling the openings, then removing the template and installing it onto the other side.

For this installation, three openings are routed - the faceplate and each side of the stile. One side of the stile is to be routed for just the mortise cylinder opening. The other side of the stile is to be routed for the cam plug and the deadlatch paddle, which is secured using two mounting screws.

A one-half inch diameter opening was drilled to accommodate the router bit.

Before routing the opening, we applied LPS Tapmatic® Edge Creme to the surface of the stile along the edges of the templates. This made the routing easier, and the creme kept much of the burrs from flying everywhere.
Important: When routing the openings, following safe tool operating procedures. Make sure the router is position flat against the surface of the template before turning on the machine. Always wait until the router bit has stopped turning completely before lifting the router off the template.  Be sure to wear eye and ear protection.

Begin by routing the two sides of the stile. Once the two sides are routed, route the faceplate opening. This sequence is recommended to avoid problems should the unlikely possibility of the router bit breaking. Because the faceplate opening is the largest, it should be routed at the end, lowering the possibility of someone getting injured.

Note: Before routing the openings for the eLatch Lock, remove any existing locks from the stile or rails. The reason: burrs created from routing and drilling the openings could cause damage to a lock mounted into the stile.
After the openings have been routed and the three 21/64” diameter holes have been drilled to accommodate the paddle binder posts (and the wiring from the paddle switch), the next step is to clean the routed openings from burrs and sharp edges. This can be accomplished using an aluminum file, wood rasp or a triangular machinist’s scraper.

Install the two paddle handle binder posts to accommodate the paddle mounting screws. Secure the binder post nuts using a 5/16” wrench. Mount the escutcheon assembly against the face of the stile and secure it with two Phillips head screws.

The next step is to consider the method of mounting the lock into the stile. There are two basic methods of mounting this type of lock into an aluminum narrow stile door. The standard method is to drill through the rear of the stile and tap for mounting screws. The down side of this method is the pocket for the glass is just about always in the middle of the stile and it can be very small. The lock is also usually mounted into the center of the stile. Drilling or tapping can result in breaking the glass.

To avoid the possibility, we installed the eLatch Lock using the Major Manufacturing Mounting Brackets, part number LMB-08. To install these brackets, an LMB-089 Installation Tool is required. The LMB-089 locates the mounting bracket within the stile channel, permitting the bracket to be secured in the proper position. The LMB-08 Mounting Brackets are secured using a 5/64” hex wrench.
Note: The upper binder post must be installed prior to mounting the LMB08.

Before installing the lock hardware into the door, connect the wiring and test the electrical operation of eLatch Lock and the paddle handle.

The Adams Rite 4200 Series eLatch Lock is equipped with five wires. They are the positive, negative, Normally Open, Normally Closed and Common. The 4591MA Paddle is equipped with three wires. They are Normally Open, Normally Closed and Common. Depending upon the application, not all wires will be connected. See Wiring Diagram for “Lock Status Wiring with Access Control.”

When wiring an access control system, a “reader” device is needed to control access from the exterior. For this installation, the reader device is a momentary switch that is used to demonstrate the operation.

When running the wiring to the eLatch Lock, the stiles and the rails are hollow and holes can be drilled from the top of the door to connect the upper rail to each of the stiles. A door cord can be used to run the wires from the jamb into the door.

When drilling the holes for access into the stiles and rail, make sure the edges have had the burrs removed to prevent cutting the insulation off the wires and creating a short.

After the wires have been run and the system has been powered and tested, install the 4200 Series eLatch Lock and 4591MA Deadlatch Paddle. Make certain the wiring is located out of the way, either behind or along side of the lock case. Using a small hex wrench to trap the wires while sliding the lock body into the stile can make wiring positioning easier.

Once the lock case is in position, start the two screws securing the lock case to the mounting brackets. Do not tighten the mounting screws until the mortise cylinder and the cam plug have been installed and the set screws tightened.
This will help to keep the lock body square within the opening.

Test the mechanical and electronic operation of the eLatch Lock to be certain it operates properly. Complete the installation by installing the faceplate.
Controlling access using an electrified lock such as the 4200 Series provides the opportunity to control access electronically without having to modify the door or jamb.
The Adams Rite 4200 Series eLatch Lock is handed. It is available with a cylinder backset at 31/32” or 1-1/8”.

For more information, contact your local distributor or:
Adams Rite, 260 Santa Fe Street, Pomona, CA 91767. Telephone: 800-872-3267. Fax: 800-232-7329. Web Site:
Major Manufacturing, Inc., 1825 Via Burton, Anaheim, CA 92806. Telephone: 714-772-5202. Fax: 714-772-2302. Website: