Storefront Lock Cylinders: Adams Rite & Mortise Cylinder Service in Chicago

Storefront Lock Cylinder Services

Adams Rite Lock Cylinders on Narrow Stile Doors

Adams Rite is the name most people use for any narrow stile door lock, because the MS1850S deadbolt and 4900 deadlatch became the industry standard for aluminum doors. An Adams Rite lock cylinder is not a special cylinder; it is a standard 1-5/32″ diameter threaded mortise cylinder fitted with the cam that matches the lock.

• Storefront deadbolt (MS1850S style): a full turn of the key throws a long steel bolt into the frame.
• Storefront deadlatch cylinder: on a deadlatch such as the Adams Rite 4900, the cylinder retracts the latch or locks and unlocks the paddle or push handle.
• Storefront hookbolt cylinder: hookbolts swing a hooked bolt into the strike and are common on sliding doors and pairs of doors; the cylinder must have the right cam to rotate the hook fully.

The narrow stile door cylinder threads directly into the lock body through the door frame. If the stile is wider than the cylinder is long, a trim ring or cylinder guard fills the gap.

Why the Adams Rite Cylinder Cam Matters

The cam is the small part on the back of the cylinder that rotates the lock mechanism. A mortise cylinder sold with a standard Yale-style cam will thread into an Adams Rite lock but may not throw the bolt fully or may jam it. Storefront locks need an Adams Rite (MS) cam, and some hookbolts, flush bolts and deadlatches use other cam profiles.

When we replace a cylinder, we compare the old cam to the new one before installation. If you are ordering a cylinder yourself, bring the old cylinder or a clear photo of its cam.

How to Measure a Mortise Cylinder

Measure from the back of the front face to the back of the brass body. Do not include the cam. Diameter on standard mortise cylinders is 1-5/32″ with fine threads, so length is the number that changes.

The right length leaves the cylinder face slightly proud of the door so it can be protected by a ring, but not so far out that it can be gripped with a wrench. If you are unsure, we measure the door on site. For a step-by-step version, see our guide on how to measure a mortise cylinder.

Cylinder Trim Rings and Storefront Cylinder Guard Rings

A cylinder trim ring is a collar that sits between the cylinder face and the door to take up extra space. Without it, the cylinder may be loose or recessed, and the cam may not reach the lock properly.

A storefront cylinder guard ring, such as a hardened steel guard, does the same job but also resists wrenching and prying. On street-level retail doors in Chicago, we recommend a guard ring wherever the cylinder face is exposed.

Rim vs. Mortise Cylinders for Storefront Doors

Panic bars and exit devices with outside key trim usually use a rim cylinder instead of a mortise cylinder. A rim cylinder mounts with two screws from the back plate, and a flat rim cylinder tailpiece reaches through the door to operate the device.

If the rim cylinder tailpiece is cut too short, bent or set at the wrong angle, the key may turn without retracting the latch. We trim or replace the tailpiece to fit the door thickness. For full exit device service, see panic bar and exit device repair.

Keyways, Interchangeable Cores and Finishes

Schlage C Keyway Storefront Cylinder

Many Chicago businesses carry Schlage keys on their key ring. A Schlage C keyway storefront cylinder, cut for the common SC1 key blank, lets your aluminum door run on the same key as your other Schlage hardware. An SC1 keyway mortise cylinder is one of the most requested replacements we install. We also work with Kwikset, Yale, Sargent, Corbin Russwin and other keyways.

SFIC and Interchangeable Core Mortise Cylinders

An SFIC mortise cylinder is a housing that accepts a small format interchangeable core, the figure-eight core used by Best and compatible systems. An interchangeable core mortise cylinder lets a control key remove the core in seconds, so you can rekey a storefront without removing the cylinder. We also service large format cores where they are already in use.

Dark Bronze Storefront Cylinder and Other Finishes

Aluminum storefronts are usually clear anodized (628) or dark bronze anodized (313). A dark bronze storefront cylinder and matching trim ring keep the door looking consistent. Satin chrome and other finishes are also available.

Storefront Lock Problems We Fix

• Storefront door lock cylinder spinning in the door
• Key turns but the bolt or latch does not move
• Key will not turn or sticks halfway
• Bolt does not reach the strike or drags
• Cylinder face damaged by prying or wrenching
• Lost keys or keys held by former staff
• Different keys for every door
• Paddle or push handle will not release the latch

Storefront Door Lock Cylinder Spinning

A cylinder that spins when you turn the key is usually loose, not broken. Mortise cylinders are held by a storefront door cylinder set screw that passes through the lock body into a groove on the side of the cylinder. On most narrow-stile locks it is reached from the edge of the door behind the lock faceplate. If the set screw has backed out, stripped or been tightened against the threads instead of the groove, the cylinder can rotate in the door and the lock will not operate.

We reset the cylinder to the correct depth, align the set screw with the groove and add a trim or guard ring if needed. A cylinder that spins after forced entry may also need a new lock body. More detail is in our guide to a storefront lock cylinder that spins.

Commercial Door Lock Replacement Kits

A commercial door lock replacement kit usually bundles a narrow-stile lock body, cylinder, thumbturn and strike. Kits work when the new lock matches the backset already cut into the door. Storefront locks come in 7/8″, 31/32″, 1-1/8″ and 1-1/2″ backsets, measured from the edge of the door to the center of the cylinder hole, and a kit with the wrong backset will not line up.

Omega replaces the complete lock when the body is worn, the bolt is damaged or the door needs a different function, and we confirm backset, faceplate shape and handing before ordering. For full lock changes on other doors, see lock installation and replacement.

Commercial Entrance Door Cylinder Locks and Life Safety

A commercial entrance door cylinder lock that is keyed on both sides can conflict with exit requirements when the building is occupied. Some jurisdictions allow a double-cylinder main entrance only with specific signage and conditions, and others require a thumbturn or exit device on the inside.

What to Expect

1. Tell us about the door. Send the address and photos of the outside cylinder, inside thumbturn or cylinder, the lock faceplate on the door edge and any panic bar.
2. We identify the hardware. The technician confirms lock type, backset, cylinder length, cam, keyway and finish.
3. You approve the work. We explain whether a rekey, cylinder replacement or full lock replacement makes sense.
4. We install and test. Every key is tried, the bolt or latch is cycled repeatedly and the set screw is checked before we leave.

Commercial Services and Restricted-Key Upgrades

Need to control who can obtain duplicate employee keys? Compare CX5 restricted-key cylinder upgrades for compatible doors. For diagnosis and sizing, use the guides below.

• How to measure a mortise cylinder
• Why a storefront lock cylinder spins

For wider business security needs, explore our Chicago commercial locksmith services, including door hardware and access control. Visit Omega Locksmith’s homepage for our full range of storefront and mobile services.

Storefront cylinder work often overlaps with commercial door repair, door closer service, lock rekeying and access control. Omega Locksmith is a local, family-operated Chicago locksmith established in 2006 at 4346 W 51st St, Chicago, IL 60632. Illinois Locksmith License #191-000821.