Which EASILOK Storefront Lock Fits Your Door? A Lock-Body-First Selection Guide

Start with the lock body already installed in your door—not the appearance of the outside trim. EASILOK products follow three different storefront-lock paths: narrow-stile deadlocks, deadlatches with an interior push paddle, and glass-door bottom-rail locks. After identifying the correct family, compare keypad operation, SFIC key override, bolt type, backset, door thickness, and existing door preparation before selecting a model.

If you are comparing a keyless storefront door lock, a mechanical keypad storefront door lock, or any commercial storefront door lock replacement, the same rule applies: identify the existing lock body first.

Quick Answer: Choose the Lock-Body Path First

This table identifies a candidate family, not a confirmed fit. A similar keypad, cylinder, or exterior plate does not prove that the lock body, backset, bolt, holes, frame, rail, or threshold will match.

Why Lock Body Comes Before Keypad, SFIC, or Color

A commercial storefront door lock is a system. The outside operator is only one visible part. Behind it are the lock body, bolt or latch, door preparation, strike, interior hardware, and the dimensions that determine whether the parts can work together.

That is why a replacement decision should follow this order:

1. Identify the existing lock-body category.
2. Confirm the door and hardware measurements.
3. Choose the operating method within the correct family.
4. Confirm the exact configuration before ordering.

Reversing this order creates avoidable mistakes. For example, choosing a product because it has a mechanical keypad does not tell you whether the door contains a deadlock, a deadlatch, or a bottom-rail lock. Those three categories are not interchangeable.

A narrow-stile keypad lock or narrow-stile mechanical lock can still follow either the deadlock or deadlatch path. Likewise, an aluminum storefront door does not make a commercial aluminum door keypad lock universal.

Step 1: Identify the Existing Lock-Body Type

Path 1: Narrow-Stile Storefront Deadlock

Investigate the deadlock family when the existing lock sits in the narrow door stile and operates a rigid hookbolt or straight deadbolt. EASILOK’s current deadlock path includes:

• SK1850: mechanical keypad deadlock without a key cylinder.
• SK1850S(sfic): mechanical keypad deadlock with an SFIC key-override configuration.
• SM1850: a separate, non-keypad Twist-to-Lock model. Only its keyless locking function is confirmed for this guide.

These models point toward compatible Adams Rite MS1850S-style applications, but the model name or appearance alone is not enough. Backset, door thickness, hookbolt or deadbolt configuration, existing holes, frame conditions, and inside hardware still have to match.

Path 2: Storefront Deadlatch with an Interior Push Paddle

Investigate the deadlatch family when a spring-loaded latchbolt engages a strike and the existing operating arrangement includes an interior push paddle. EASILOK’s current deadlatch path includes:

• SK4510: mechanical keypad deadlatch without a key cylinder, supplied for a push-paddle application.
• SK4510S(sfic): mechanical keypad deadlatch with SFIC key override, a reversible latchbolt, and a non-handed push paddle.

The replacement directions are Adams Rite 4510-style for SK4510 and MS4510S-style for SK4510S(sfic), subject to field verification. A push paddle is interior operating trim; it does not by itself prove the exact lock body or configuration.

Path 3: Glass-Door Bottom-Rail Lock

Investigate the bottom-rail family when the lock is built into the lower rail of a glass door near the threshold or floor. EASILOK’s current bottom-rail path includes:

• SK777: mechanical keypad bottom-rail lock without a key cylinder.
• SK777S(sfic): mechanical keypad bottom-rail lock with SFIC key override.

The catalog’s replacement-reference directions are CRL 777S, FHC R777, and ILCO BRL. These references do not make the products universal glass-door locks. Rail construction, old-lock dimensions, threshold clearance, removal path, and cylinder requirements must be checked. Do not use glass thickness as a substitute for rail measurements.

Step 2: Choose the Operating Method Within the Correct Family

Once the lock-body path is clear, compare how the door should be operated.

Mechanical Keypad Without a Key Cylinder

The no-cylinder keypad models are SK1850, SK4510, and SK777. Each belongs to a different lock-body family:

• SK1850 is a storefront deadlock.
• SK4510 is a storefront deadlatch.
• SK777 is a glass-door bottom-rail lock.

They share a mechanical keypad concept, but they cannot replace one another.

Mechanical Keypad with SFIC Key Override

The SFIC versions are SK1850S(sfic), SK4510S(sfic), and SK777S(sfic). SFIC means Small Format Interchangeable Core. It describes a core format, not automatic compatibility with every existing key or master-key system.

An SFIC decision therefore has two separate checks:

1. Does the lock and door fit the selected EASILOK family and configuration?
2. Does the proposed SFIC core match the facility’s core specification, keyway, pin count, and keying requirements?

A “yes” to the first question does not guarantee a “yes” to the second.

Non-Keypad Twist-to-Lock

SM1850 is the non-keypad branch of the deadlock family. Its confirmed function for this guide is mechanical Twist-to-Lock locking. Verify the exact current configuration with EASILOK before ordering. Do not group SM1850 with the six keypad models.

Mechanical Operation: No Batteries, Wiring, or App

For buyers researching a no-battery storefront door lock or mechanical push-button storefront lock, the six confirmed EASILOK keypad models—SK1850, SK1850S(sfic), SK4510, SK4510S(sfic), SK777, and SK777S(sfic)—use mechanical keypad operation. Normal code operation does not require batteries, wiring, or an app. This also means they should not be described as providing app control, remote unlocking, access logs, or electronic user permissions.

All Seven Current EASILOK Storefront Models

Use this table to narrow the choice, then verify the exact SKU and current product configuration on the corresponding product page or with EASILOK support.

Match the Lock to the Business Need—After Fit Is Established

Keyless Lock for a Retail Storefront or Small-Business Entrance

A keyless lock for a retail storefront or small-business entrance still begins with the existing hardware. If the door has a deadlock, compare the deadlock models. If it has a deadlatch and push paddle, compare the deadlatch models. If the lock sits in a glass-door bottom rail, use the bottom-rail path.

Storefront Lock for Employee Access

Mechanical keypad models may reduce routine physical-key handoffs among employees, managers, cleaners, or vendors. They should not be presented as electronic access-control systems: this guide does not claim remote credential changes, schedules, individual-user tracking, or audit logs.

Existing Master-Key or Emergency-Key Requirement

If the facility needs a key-override path or wants to retain an existing SFIC system, investigate the S (SFIC) model in the already-confirmed lock-body family. Then verify the core and keying system separately.

What to Check Before Ordering

For narrow-stile deadlock and deadlatch families, the current catalog includes 31/32-inch, 1-1/8-inch, and 1-1/2-inch backset options and lists a 1-3/8-inch to 1-3/4-inch door-thickness range. Those numbers are selection inputs, not proof of compatibility.

Collect the following evidence:

1. Outside view: the exterior operator and surrounding door stile.
2. Inside view: knob, thumb turn, push paddle, or other interior hardware.
3. Door-edge view: faceplate, lock-body position, and existing preparation.
4. Bolt or latch view: hookbolt, straight deadbolt, or spring-loaded latchbolt.
5. Frame and strike view: the part that receives the bolt or latch.
6. Full-door view: swing or sliding configuration and door handing.
7. Model markings: labels or stamped numbers on the old hardware.
8. Physical measurements: backset, door thickness, faceplate, and relevant holes using a real ruler or tape.
9. Bottom-rail evidence when applicable: rail profile, threshold or floor interface, old-lock dimensions, and removal clearance.
10. SFIC details when applicable: core format, keyway, pin count, and facility keying requirement.

For a more detailed visual check, use the storefront lock identification guide. For measurement basics, review the existing storefront lock measurement guide.

When Is a Drill-Free Replacement Possible?

If you need a replacement lock for an existing aluminum storefront door, a drill-free replacement may be possible in a compatible legacy deadlock or deadlatch application when the existing lock body, holes, backset, door thickness, bolt or latch, frame, strike, and surrounding hardware match the selected configuration. It is not a universal promise for every Adams Rite lock, aluminum storefront door, or site condition.

For SK777 and SK777S(sfic), use the bottom-rail checklist instead. Confirm the CRL 777S, FHC R777, or ILCO BRL-type reference, rail construction, threshold space, old-lock dimensions, and removal path. This guide does not make a universal drill-free claim for bottom-rail applications.

If the door preparation is unusual, the measurements conflict, or safe egress hardware is involved, ask a qualified locksmith or door professional to review the opening.

Frequently Asked Questions

Which EASILOK lock family fits my existing storefront lock?

Start with the existing lock-body type: deadlock, deadlatch, or bottom rail; only then compare model features. Use front, inside, door-edge or rail, bolt or latch, strike, and measurement photos to identify a candidate family. Final selection still requires the exact dimensions, door preparation, and operating configuration to match.

Do EASILOK mechanical keypad locks need batteries, wiring, or an app?

The six confirmed keypad models—SK1850, SK1850S(sfic), SK4510, SK4510S(sfic), SK777, and SK777S(sfic)—are mechanical. Normal code operation does not depend on batteries, wiring, or an app. SM1850 is a separate non-keypad Twist-to-Lock model and is not part of this six-model keypad group.

Where can I find the correct installation and code-change guide for my EASILOK model?

Start with the exact current model’s product page: open the installation or code-change resource tied to that model, then verify the configuration against the instructions supplied in the box. Do not use another family’s guide. If the correct file or video is not clearly linked, contact EASILOK support with the full model, backset, bolt or latch, finish, and SFIC status and request the current guide before proceeding.

Sources and Verification

• EASILOK storefront deadlock collection
• EASILOK storefront deadlatch collection
• EASILOK bottom-rail lock collection
• Adams Rite 4510 Standard Duty Deadlatch
• CRL 777S Door Rail Floor Lock

Product-family and model statements were checked against the current EASILOK catalog and product documentation. Last reviewed: July 23, 2026.

Start with Evidence, Then Choose the Family

First identify the lock body and collect clear photos and measurements. Then review the EASILOK storefront deadlock collection, storefront deadlatch collection, or bottom-rail lock collection. If any part of the fit remains uncertain, send the evidence to EASILOK support or ask a qualified door professional before ordering.