My Storefront Door Lock Is Broken—What Replacement Lock Do I Need?

Replace a broken storefront door lock with the same physical lock category and a configuration that matches the existing opening. A bolt in the narrow aluminum edge points to the 1850 deadlock family; a spring latch with an inside push paddle points to the 4510 deadlatch family; a lock inside an all-glass door’s lower rail points to the 777 bottom-rail family. Then match dimensions, holes, receiver, access method, and key-override needs.

First, Make the Door Safe and Identify What Actually Failed

If the door will not release from the inside, has been damaged during a break-in, cannot be secured, or interferes with an exit route, stop using it and contact a qualified local commercial-door or locksmith professional. A replacement purchase should not delay an urgent safety or security repair.

For a non-emergency failure, record what the lock does before removing anything:

• Does a solid bolt no longer project, retract, or align with the frame receiver?
• Does the door have a spring latch that fails to catch or retract when the inside push paddle is pressed?
• Is the lock in the lower rail of an all-glass door, with a bolt that should enter a floor receiver?
• Is the lock body broken, or is the problem coming from a loose operator, damaged strike, shifted door, dirty receiver, bent frame, or worn key/core?

The symptom tells you where to inspect; the installed hardware tells you which replacement family to buy. Do not order from the outside keypad shape alone.

Use the Lock Location and Action to Choose the Replacement Family

These product families solve different preparations. Even if two products both have a mechanical keypad, a narrow-stile deadlock cannot replace a push-paddle deadlatch, and neither can replace an all-glass bottom-rail body.

Replacement Path 1: A Bolt in the Narrow Aluminum Door Edge

An old Adams Rite lock or MS1850S lock may point to this branch when the installed hardware is a narrow-stile deadlock. The invoice or maintenance record may instead say Adams Rite deadbolt or MS1850S deadbolt after someone notices a solid bolt at the door edge. Record the complete old marking, but let the physical body, bolt, backset, holes, and frame confirm the category.

For a compatible MS1850S-style preparation, choose the operating method your business needs:

• SK1850 provides mechanical keypad locking and unlocking without a key cylinder.
• SK1850S(sfic) adds an SFIC key-override path to mechanical keypad operation. Confirm the actual core, keyway, and pinning system separately from door fit.
• SM1850 provides interior Twist-to-Lock operation without a key or code, while exterior entry uses a physical key through an SC keyway. It is not an exterior keyless keypad replacement.

Then select the correct deadbolt or hookbolt configuration and backset, confirm the structural door thickness, and compare the faceplate, holes, receiver, frame, handing, finish, and included parts with the selected SKU.

Replacement Path 2: A Spring Latch With an Inside Push Paddle

If the door latches when it closes and staff press an inside paddle to exit, begin with the deadlatch branch. The old label may read Adams Rite deadlatch or Adams Rite 4510 series lock, but the spring-latch action, paddle, strike, backset, door thickness, holes, and handing determine the practical replacement path.

For a compatible 4510-style preparation:

• SK4510 is the no-cylinder mechanical keypad option with a push paddle.
• SK4510S(sfic) combines mechanical keypad operation with an SFIC key override, a reversible latchbolt, and a universal-design push paddle.

Do not replace only the visible outside trim while ignoring a damaged latch body, misaligned strike, or unsuitable inside exit hardware. The deadlatch, paddle, door, and frame must work as one opening.

Replacement Path 3: A Lock at the Bottom of an All-Glass Door

If the lock is housed in the lower rail and its bolt enters the floor or threshold, it belongs to the bottom rail lock category. Short references such as CRL777, FHC777, or ILCO may appear in old records, but preserve the complete marking and suffix shown on the installed hardware.

For a compatible CRL 777S, FHC R777, or ILCO BRL-style bottom-rail preparation:

• SK777 provides mechanical keypad locking and unlocking without a key cylinder.
• SK777S(sfic) adds an SFIC key-override path.

Before ordering, compare the complete old lock, lower-rail profile, lock dimensions, bolt and floor receiver, threshold clearance, removal path, and required core. The listed product thickness field should not be treated as the glass thickness; the relevant structure is the complete rail and installed opening.

The Name on the Work Order Is Not Necessarily the Model You Buy

A broken-lock work order often begins with a description rather than a complete product name. It may say storefront door deadbolt, storefront deadbolt, store deadbolt, shop deadbolt, commercial door deadbolt, glass door deadbolt, or shop door deadbolt. Those labels describe a likely bolt-lock need, but they do not prove an MS1850S-style preparation or a specific EASILOK SKU.

A generic service request may simply say storefront door lock, storefront lock, commercial door lock, or glass door lock. Treat that wording as the starting description, then identify the lock’s location, action, inside hardware, complete marking, and dimensions. This keeps a familiar label from becoming the wrong purchase.

Can You Replace It Without Changing or Drilling the Door?

Often, a matching replacement can reuse an existing preparation, but this depends on the actual opening. Confirm all of the following before treating the job as a no-new-drilling replacement:

1. Same lock-body category: deadlock, deadlatch, and bottom-rail bodies are not interchangeable.
2. Matching lock geometry: compare body dimensions, bolt or latch, faceplate, and operating parts.
3. Correct backset and door thickness: choose the exact configuration rather than the closest visual match.
4. Matching holes and clearances: include every existing hole, filler plate, repair, frame stop, rail wall, and trim clearance.
5. Usable receiver: verify the frame strike, bolt receiver, or floor receiver and its alignment.
6. Correct handing and inside operation: document the viewing side, swing, paddle, thumbturn, or other operator.
7. Correct access path: choose keypad only, keypad with a verified SFIC override, or an appropriate physical-key option.
8. Serviceable door and frame: a dropped door, bent frame, damaged rail, or shifted threshold may need correction before a new lock can work properly.

If the existing preparation and selected configuration match, replacing the lock without adding holes may be practical. If they do not match, forcing a “drop-in” purchase can create a poor fit or leave the actual door problem unresolved.

What to Photograph and Measure Before You Order

Create one record for the complete opening:

• full door from outside and inside;
• open door edge or complete lower rail;
• bolt or latch in both operating positions;
• inside paddle, thumbturn, cylinder, or other operator;
• frame strike, bolt receiver, or floor receiver;
• complete brand and model marking, including every suffix;
• backset and structural door thickness for an aluminum edge lock;
• faceplate, holes, rail profile, lock-body dimensions, and threshold clearance as applicable; and
• damaged, loose, bent, repaired, or misaligned areas around the lock and door.

Use a physical ruler and show both reference points in the same image. Keep wide-context photos as well as close-ups. This set is useful to EASILOK support, the seller, or the professional who will install and align the replacement.

Choose the Access Method After the Hardware Family Is Known

Do not let a feature request override the installed lock category. First decide whether the door needs an 1850, 4510, or 777-style body; then choose between:

• mechanical keypad operation without a key cylinder;
• mechanical keypad operation with an SFIC key-override path; or
• for a matching 1850-style deadlock application, SM1850 interior Twist-to-Lock with exterior physical-key entry.

If you manage several locations, an SFIC option may support an existing core-management workflow, but “SFIC” alone does not confirm that the supplied or selected core works with your keys. Verify the core format, keyway, pinning, control key, and ordering plan.

A Replacement Buying Sequence You Can Follow

1. Make the opening safe and record the failure.
2. Locate the lock body at the vertical aluminum edge or inside the bottom rail.
3. Identify a deliberately thrown deadlock bolt, push-paddle deadlatch, or bottom-rail bolt.
4. Match that category to the EASILOK 1850, 4510, or 777 family.
5. Select the needed keypad, SFIC, or keyed-entry workflow.
6. Measure the existing preparation and compare the exact configuration.
7. Confirm the receiver, frame or threshold, door condition, and installation plan.
8. Order only after the selected SKU and the recorded opening agree.

Frequently Asked Questions

If my storefront door lock is broken, how do I know which replacement type to buy?

Identify where the lock body sits and how it secures the door. A deliberately thrown bolt in a narrow aluminum stile points to the 1850 deadlock family; a spring latch with an inside push paddle points to the 4510 deadlatch family; a lock in an all-glass lower rail points to the 777 family. Then match dimensions and access needs.

Can I replace a storefront lock without changing or drilling the door?

Yes, when the existing lock category, body geometry, backset, door thickness, bolt or latch, holes, receiver, handing, and selected configuration match. The model name alone cannot promise a no-new-drilling replacement. Photograph and measure the opening before ordering, and correct any door, frame, rail, strike, or threshold problem that would prevent the new lock from aligning.

Related EASILOK Guides

• How to identify a storefront deadlock, deadlatch, or bottom-rail lock
• How to measure an existing storefront lock
• SK1850 compatibility guide
• SK4510 compatibility guide
• Glass-door bottom-rail lock compatibility guide

Replace the Installed Function, Not Just the Visible Trim

The most useful replacement record combines the failed action with the complete opening: whole door, lock-body location, bolt or latch, inside hardware, receiver, old marking, measurements, and damage. Once those details place the door in the 1850, 4510, or 777 family, you can choose the access method and exact EASILOK configuration with far less guesswork.

Searching "shop lock"? What you want is called a keyless storefront door lock.

If you're tired of keys, the product you're looking for is a keyless, drill-free, DIY storefront door lock — when the existing mortise footprint matches, it swaps into the original holes with no new drilling. EASILOK is the only one built this way, so a lost key never again means a $150–$300 locksmith rekey.