Quick Answer

Security Parts stocks 75 replacement components for the LCN 4110 and 4110T Smoothee series. The 4110 is a parallel arm push side closer and the EDA arm is shipped as standard. Optional arms include the CNS Cush-N-Stop, the SCNS Spring Cush-N-Stop (unique to the 4110 family), and hold-open variants for each. The 4110 also carries a full range of fusible link arm components for fire-rated door applications. Arms, covers, and drop plates are specific to the 4110 or 4110T and cannot be interchanged between the two. Confirm the model number, hand, and arm type before ordering. Call 845-935-0301 for identification support.

What Is the LCN 4110 Smoothee Series?

The LCN 4110 Smoothee Series is a heavy duty, cast iron surface-mounted door closer designed exclusively for parallel arm push side installations. It is purpose-built for institutional and high-traffic commercial applications including classroom doors, auditorium doors, healthcare corridor doors, and any opening where the closer body must mount on the push side and the arm must run parallel to the door to keep the hardware as concealed as possible.

The 4110 is application-specific, which means it is engineered for one mounting position only. It cannot be converted to regular arm or top jamb mount in the field. When a 4110 is ordered, the hand of the door (right or left) must be specified at the time of order. The 4110 ships with the Extra Duty Arm (EDA) as standard, a standard plastic cover, the 4110-201 fifth hole spacer, and self-reaming and tapping screws.

What Is the LCN Green Dial on the 4110?

The LCN Green Dial is a patented spring power indicator built into the 4110 (and all 4000 Series) closer body. It provides a direct visual reading of the current spring power setting without requiring the cover to be removed or the cylinder to be replaced. A technician can verify and adjust the spring power setting in the field by reading the Green Dial position. When a 4110 begins closing too slowly or fails to latch, checking and increasing the Green Dial spring setting is always the correct first step. Most unnecessary cylinder replacements on 4110 installations happen because the technician did not know the spring power was adjustable on the existing cylinder.

The 4110 series uses a flat-sided oval spindle, the same spindle geometry as the 4010 and 4020 series. This matters for parts ordering: arms from the 4040XP (hex spindle) and 1460 (star spindle) do not fit the 4110. All arm replacement orders must specify the correct series designation (4110) to ensure spindle compatibility.

The LCN 4110 carries a 30-year warranty and holds the following certifications: ANSI A156.4 Grade 1, UL 10C, ADA, 100-hour salt spray (more than four times the ANSI standard for corrosion resistance), and the BAA Buy American Act requirement. The fusible link arm assemblies carry UL Listing number R1943. The 4111 cylinder meets ADA opening force requirements. The closer and its components are made in the USA.

Inside the 4110 body: a cast iron cylinder with a full complement bearing, a 1-1/2-inch diameter piston, and an 11/16-inch diameter double heat-treated pinion journal. Full rack and pinion hydraulic action drives the closing speed. The all-weather Liquid X hydraulic fluid performs without variation from -30 degrees F to +120 degrees F, so the 4110 never needs seasonal closing speed adjustment. The Peel-N-Stick installation templates simplify field installation: template 28479 covers regular arm mounts, 28481 covers CUSH and Spring CUSH mounts, 28501 covers the drop plate, and 26367 covers the fusible link arm.

What Are the LCN 4110 Cylinder Options?

The LCN 4110 series uses model numbers 4111 through 4116. The cylinder model number is stamped on the closer body near the packing nut. Numbers such as "71" or "320G" found elsewhere on the body are manufacturing reference numbers, not model numbers, and cannot be used to order parts.

Optional cylinder upgrades available on the 4110 series:

• AVB (Advanced Variable Backcheck): Backcheck begins at approximately 45 degrees instead of the standard 75 degrees, providing earlier resistance against the door being pushed or blown open aggressively. Especially useful with the SCNS arm on high-abuse openings.
• DEL (Delayed Action): The door holds at the maximum opening position for an adjustable delay of up to approximately one minute before the closer begins its closing sweep. Not available with the 4116 cylinder.
• TEL (Time-Controlled Electro-Hydraulic): An electrified delayed action option. Confirm availability for specific applications.

For a full comparison of the 4110 against other 4000 Series closers, see the LCN 4000 Series parts guide. For installation and adjustment guidance, see how to install a commercial door closer and how to adjust a commercial door closer.

What Is the Difference Between the LCN 4110 and 4110T?

The 4110 and 4110T share the same cast iron cylinder body but use entirely different arm systems. Knowing which variant is installed determines which arm, cover, and drop plate to order.

Always verify the variant stamped on the closer body before ordering. The model number is located near the packing nut at the base of the pinion. Numbers such as "71" or "320G" found stamped elsewhere on the cylinder are manufacturing reference numbers and cannot be used to order parts.

What Is the Difference Between the LCN 4110 and 4210?

Both the 4110 and the 4210 are Smoothee series parallel arm push side closers. They share a similar application profile and look similar in the field, which causes ordering confusion. The key differences are in the security specification and fastener system.

The 4210 is the high security variant. It ships with TORX machine screws as standard rather than SRT screws, and uses a four-point metal security cover mounting rather than two-point. The 4210 is specified for correctional, vandal-prone, and institutionally secure applications where tampering resistance is a priority. The 4110 is specified for standard institutional and high-traffic commercial applications that do not require the elevated tamper resistance of the 4210.

Parts are not cross-compatible between the 4110 and 4210 series. Covers, arm screws, and drop plates are series-specific. The 4110 SCNS Spring Cush-N-Stop arm family is not available on the 4210. For a detailed comparison, see the LCN 4210 parts guide.

What LCN 4110 Parts Are Available?

All 75 LCN 4110 and 4110T Smoothee series replacement parts stocked at Security Parts are organized below by component category.

Arm Selection: Which LCN 4110 Arm Do I Need?

Arm selection is the most common parts decision on the LCN 4110 series. The 4110 offers more arm variants than most other LCN closer families, including the Spring Cush-N-Stop (SCNS) family that is unique to this series.

What Is the LCN 4110 Extra Duty Arm (EDA)?

The 4110-3077EDA Extra Duty Arm is the standard arm shipped with the LCN 4110 closer. It is a non-handed, heavy duty parallel arm that mounts push side only. The degree of door opening is set at installation by the template used, with options at 100 degrees, 140 degrees, and 180 degrees.

Because the EDA arm is non-handed, a single part number fits both right-hand and left-hand doors. If a door stop is also required, it must come from a separate overhead stop device rather than the arm itself. The hold-open version is the 4110-3049EDA Hold Open Extra Duty Arm, which is handed and must be specified right-hand or left-hand at order.

What Is the LCN 4110 Cush-N-Stop (CNS) Arm?

The 4110-3077CNS Cush-N-Stop Arm is an optional handed arm with a built-in stop in the soffit shoe. When the door reaches its templated maximum opening angle, the arm contacts the stop and arrests the door without needing a separate overhead or wall stop device. This simplifies the hardware specification on openings where both a closer and a stop are needed.

The CNS arm is handed and must be specified as right-hand or left-hand. The drop plate (4110-18) is required for CNS arm installations. The CUSH shoe support (4110-30) is required when the frame reveal is less than 3-1/16 inches. The fifth hole spacer (4110-201) provides the mounting point for the fifth shoe screw. Installing a CNS arm with a separate overhead stop device is redundant and not recommended since both mechanisms would compete on the same door.

What Is the LCN 4110 Spring Cush-N-Stop (SCNS) Arm?

The Spring Cush-N-Stop (SCNS) arm is a feature of the 4110 series that competitors and parts distributors rarely explain in depth. The 4110-3077SCNS Spring Cush-N-Stop Arm provides a built-in door stop like the CNS arm, but adds a spring-loaded cushion mechanism that absorbs the impact shock when the door hits the stop.

On high-cycle doors, the repeated impact of the door reaching maximum opening transfers significant force through the arm and into the closer body and pinion. The spring cushion in the SCNS arm dissipates this force rather than transmitting it directly, reducing long-term wear on the closer, the arm pivot, and the surrounding door hardware. The SCNS arm is specifically recommended for applications using Advanced Variable Backcheck (AVB), where the closer is adjusted to resist door opening force earlier in the swing, creating conditions where the door hits the stop with greater impact.

The SCNS arm is non-handed, which is an operational advantage over the CNS arm on large institutional hardware orders. The hold-open version is the 4110-3049SCNS Hold Open Spring Cush-N-Stop Arm. The 4110-3080 Spring Cush Block assembly (which includes the spring screw 4110-58 and block 4110-80G) is the replaceable spring mechanism used in the SCNS arm system when the cushion component itself requires servicing.

What Are the LCN 4110 Fusible Link Arm Components?

The LCN 4110 is one of three LCN surface closer series (alongside the 4010 and 4020) that offers a complete fusible link arm system for fire-rated door applications. The fusible link arm components allow the 4110 to be installed as a hold-open closer on a fire-rated door while still meeting the requirement that the door must close automatically when exposed to elevated temperatures from a fire event.

The fusible link melts at 165 degrees F, releasing the hold-open function and allowing the closer spring to return the door to the closed and latched position. This is a code-required feature on fire-rated doors where a hold-open closer is otherwise installed.

For guidance on fire-rated door hardware requirements and compliance, see the commercial door fire rating guide.

LCN 4110T Track Arm Components

The 4110T uses a track arm system in place of the parallel rod and shoe. The track arm is handed and must be specified at order.

LCN 4110 Covers: Standard vs Metal Security

The LCN 4110 series offers two cover types: a standard plastic cover and a metal security cover. The cover is finish-specific and must be specified with the correct finish code to match the installed hardware.

The cover screw for the 4110 is the 4110-31. The 4110T uses the 4110T-31 cover screw. These are not interchangeable.

When Is the LCN 4110-18 Drop Plate Required?

The 4110-18 Drop Plate has two trigger conditions that require it to be included in an installation.

• The top rail is less than 5-1/8 inches measured from the stop on a push side parallel arm mount.
• Any CNS (Cush-N-Stop) or SCNS arm installation, regardless of top rail depth.

The plate requires a minimum top rail of 2 inches measured from the stop. If the top rail is less than 2 inches, the drop plate cannot be used on that opening.

A frequently asked question from the LCN community is whether the 4110-18 and the 4110-18 CUSH drop plates are different parts. They are physically identical. The designation "CUSH" refers only to the installation template used on the door, not to any difference in the plate itself.

The 4110T uses the separate 4110T-18 drop plate, which is specific to the track arm variant and cannot be substituted for the 4110-18.

LCN 4110 Accessories: Cush Shoe Support, Blade Stop Spacer, and Panel Adapter

Several accessories are required or optional depending on the frame conditions at the specific installation. These are frequently missed at order time and are the most common cause of delayed installations on CNS and SCNS arm applications.

What Is the LCN 4110-30 Cush Shoe Support?

The 4110-30 Cush Shoe Support provides anchorage for the fifth screw used with CNS and SCNS arms when the frame reveal is less than 3-1/16 inches. On a standard CNS or SCNS arm installation, the CUSH shoe is mounted to the frame with five screws. The fifth screw provides critical anchorage because the built-in stop generates significant force at the shoe connection point each time the door reaches its maximum opening angle. When the frame reveal is too narrow for a standard five-screw installation, the CUSH shoe support provides the mounting surface for that fifth screw. Without it, repeated door stops can pull the shoe away from the frame over time.

What Is the LCN 4110-61 Blade Stop Spacer?

The 4110-61 Blade Stop Spacer is used when a 1/2-inch blade stop is installed in the door frame. The spacer lowers the parallel arm shoe to clear the blade stop during door travel. Without the spacer, the shoe contacts the blade stop before the door reaches its full intended opening angle, limiting door travel and potentially damaging the arm.

What Is the LCN 4110-419 Panel Adapter?

The 4110-419 Panel Adapter is needed when the CUSH shoe must mount to a single rabbeted or flush frame that does not present a horizontal mounting surface for the shoe. The adapter provides the horizontal surface the CUSH shoe requires for a correct CNS or SCNS arm installation.

What Is the LCN 4110-201 Fifth Hole Spacer?

The 4110-201 Fifth Hole Spacer provides the positioning point for the fifth mounting screw at the CUSH shoe. The standard 4110 closer ships with the 4110-201 included. Order this spacer whenever specifying any CNS or SCNS arm installation where the fifth screw position must be established.

LCN 4110 Screw Packs: SRT, TORX, and Thru-Bolt Options

The standard LCN 4110 ships with SRT (self-reaming and tapping) screws, unlike the 4210 which ships with TORX screws as standard. The 4110 series offers the full range of screw pack options for both the 4110 and 4110T variants.

How Do I Order the Correct LCN 4110 Replacement Part?

Confirm each of the following before placing an order to avoid receiving a part that does not fit the installation.

View all LCN 4110 and 4110T parts and diagrams at Security Parts commercial door closer parts. Call 845-935-0301 for pre-order identification support or to confirm specifications before ordering.

Troubleshooting Common LCN 4110 Field Issues

LCN 4110 vs LCN 4040XP: Which Parallel Arm Closer Do I Have?

Facilities managers and locksmiths sometimes encounter both the 4110 and the 4040XP mounted in parallel arm configuration on the same building, which leads to ordering confusion. The two closers look similar from across a hallway but use completely different spindle geometry and arm families.

The 4110 uses a flat-sided oval spindle and mounts push side only in parallel arm configuration. It ships with the EDA arm as standard. The 4040XP uses a six-sided hex spindle and can be mounted in regular arm, parallel arm, and top jamb configurations. An arm from the 4040XP family will not fit on a 4110 and vice versa. Confirm which model is installed by reading the model number stamped near the packing nut on the closer body before ordering any arm replacement. For a detailed guide to the 4040XP arm family, see the LCN 4040XP parts guide.

LCN 4110 Applications: Where Is This Closer Specified?

The LCN 4110 Smoothee is specified in applications where the door control must mount on the push side with a parallel arm configuration. This is the standard specification for many institutional building types because it keeps the closer body and arm concealed from the pull side of the door, reducing tampering risk and maintaining the appearance of the opening.

Common 4110 application types include:

• Classroom doors in K-12 schools and university buildings, where the closer body must face the corridor and not the classroom interior
• Auditorium and assembly room doors where the push side faces a public area
• Healthcare corridor doors where infection control and cleanability favor hardware mounted on the corridor side
• Government building interior doors where the push side faces a public or controlled area
• Office suite entrance doors where the arm and closer body should not be visible from the reception area
• Fire-rated corridor doors where the 4110-3049FL fusible link arm is required for code-compliant hold-open operation

The 4110 is not appropriate for regular arm or top jamb installations. Those applications require the 4010, 4020, 4030, or 4040XP series. For guidance on selecting the correct LCN closer series for an application, see the LCN door closer selection guide and the commercial door closer sizing guide.

Can the LCN 4110 Be Used With a Door Coordinator?

Yes, but a specific mounting solution is required. When the 4111 is used with a bar-style door coordinator, IVES MB mounting brackets are required. These brackets wrap around the coordinator to provide a surface for mounting the parallel arm shoe. Without the IVES MB brackets, the parallel arm shoe cannot mount correctly when a bar-style coordinator is present across the top of the door frame. Contact Security Parts at 845-935-0301 to confirm the correct bracket configuration before ordering.

Can the LCN 4110 EDA Be Used With a Glynn Johnson Overhead Stop?

This is one of the most frequently asked questions from the professional locksmith and door hardware community about the 4110. Two different scenarios apply depending on which Glynn Johnson overhead stop is installed.

For the GJ901 through GJ904 series: Special Template ST-2730 is required to mount the 4110 EDA closer with these overhead stops. If a drop plate is also required on the same opening, use the 4010-18 drop plate, not the 4110-18 drop plate. The two plates are not interchangeable in this specific combination.

For the Glynn Johnson GJ100 concealed overhead stop series: No special template is required. The 4110 EDA closer drops far enough on the door that it does not conflict with the GJ100 series concealed overhead stop, and the two can be mounted together using standard 4110 installation templates.

LCN 4110 Maintenance: What Does This Closer Require?

Closers mounted according to LCN installation instructions require no periodic maintenance or seasonal adjustments. The all-weather hydraulic fluid in the 4110 performs consistently across the full operating temperature range without the need for spring or speed adjustments between seasons.

The one service item that is regularly needed on high-cycle 4110 installations is spring power adjustment using the Fast Power Adjust indicator on the closer body. If a 4110 begins closing too slowly or fails to latch reliably, increasing the spring power setting is the correct first step before any cylinder replacement is considered. Most unnecessary cylinder replacements on 4110 installations happen because the technician is not aware that the spring power is adjustable without removing the cover or replacing the cylinder.

If a 4110 develops a hydraulic fluid leak, the fluid cannot be refilled in the field. Attempting to refill the hydraulic fluid voids the warranty. A leaking closer requires replacement of the cylinder assembly or the full closer body depending on where the leak originates. Call 845-935-0301 for guidance before ordering any replacement part on a leaking 4110.

The CUSH shoe and arm connections on CNS and SCNS arm installations should be inspected annually on high-cycle doors. The fifth screw connection at the shoe is the most common failure point on heavy-traffic CUSH arm applications. If the shoe is showing movement or the fifth screw connection is loose, inspect the CUSH shoe support (4110-30) and fifth hole spacer (4110-201) for correct installation before replacing the arm assembly.

About Security Parts

Security Parts has supplied genuine OEM commercial door hardware components to locksmiths, glaziers, facilities managers, contractors, and security integrators since 2001. All 75 LCN 4110 and 4110T Smoothee series replacement parts listed in this guide are stocked and available for individual order. The LCN 4110 series has more arm variants than most other LCN closer families, and ordering errors on handing, arm type, and accessory requirements are common. Confirm the installed model number, hand, and arm configuration before placing any order. Call 845-935-0301 for pre-order identification support. Security Parts stocks genuine OEM LCN components, ensuring that replacement parts match the original specifications for fit, material, and code compliance. The 4110 series has one of the widest arm option ranges of any LCN surface closer, and confirming the correct arm type, handing, and accessory requirements before ordering prevents the most common return and delay scenarios.

Related Resources at Security Parts

• Commercial Door Closer Parts and Diagrams
• Door Closers Parts Guide
• LCN 4000 Series Parts Guide
• LCN 4210 Parts Guide
• LCN 4040XP Parts Guide
• LCN Door Closer Selection Guide
• Commercial Door Closer Sizing Guide
• How to Install a Commercial Door Closer
• How to Adjust a Commercial Door Closer
• Commercial Door Fire Rating Guide