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LCN 4510-7351 Smoothee Surface-Mounted Hydraulic Door Closer for Commercial Applications
The LCN 4510-7351 Smoothee is a heavy-duty, surface-mounted hydraulic door closer engineered for rigorous commercial interior applications. It provides superior door control with adjustable closing and latching speeds, integrated back-check, and a robust cast iron body with forged steel arms, certified to ANSI/BHMA A156.4 Grade 1 for exceptional durability.
Quick Answer
The LCN 4510-7351's primary strength lies in its unparalleled durability and precise hydraulic control, ensuring consistent, safe operation in high-traffic commercial environments for millions of cycles.
✓ANSI/BHMA A156.4 Grade 1 Certified
✓10,000,000 Cycle Tested Durability
✓Adjustable Closing & Latching Speed Control
✓Integrated Hydraulic Back-Check
✓Robust Cast Iron Body with Forged Steel Arms
✓30-Year Limited Manufacturer Warranty
✓Suitable for Interior, High-Traffic Commercial Doors
The LCN 4510-7351 Smoothee is a top-tier hydraulic door closer for high-traffic interior commercial applications, offering exceptional durability and precise, adjustable door control backed by a 30-year warranty. Its Grade 1 certification and 10-million cycle rating underscore its robust engineering and long-term reliability.
✓ Who Should Buy
- •Facility Managers of Commercial Buildings
- •Architects Specifying High-Traffic Interior Door Hardware
- •Engineers Requiring ANSI/BHMA Grade 1 Door Control
- •Maintenance Teams Needing Durable, Low-Maintenance Solutions
- •Installers Seeking Reliable and Adjustable Surface Mount Closers
✕ Who Should Avoid
- •Applications Requiring Fire-Rated Closers
- •Installations on Exterior Doors Exposed to Elements
- •Budget-Constrained Projects Where Grade 1 Over-specification is Not Justified
- •Doors Requiring Hold-Open or Delayed Action Functionality
Product Overview
The LCN 4510-7351 Smoothee is a premium hydraulic door closer designed for demanding commercial interior environments. Manufactured in the USA, this surface-mounted, handed closer features a durable cast iron body complemented by extra-duty forged steel arms, all finished with a protective powder coat. It offers extensive adjustability with a power size range of 1-6 (or specified sizing), allowing precise calibration for various door widths up to approximately 1524mm. Critical control features include independently adjustable closing and latching speeds, alongside integrated hydraulic back-check to prevent abusive door openings. While UL Listed and meeting ANSI/BHMA A156.4 Grade 1 – the highest standard for door closers – it is important to note that the 4510-7351 is not fire-rated, nor does it include hold-open or delayed action functionality. This model provides a maximum opening angle of 140 degrees, ensuring optimal pedestrian flow control.
| Brand | lcn |
| Model Name | N/A |
| Category | Door Closer |
| Closer Type | Hydraulic |
| Series | 4510 Smoothee |
| Model Year | 2018-2026 |
| Country Of Origin | N/A |
| Intended Use | Commercial / High Traffic |
| Suitable For | Interior Doors |
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Engineering Analysis
The LCN 4510-7351 embodies robust engineering principles, meticulously designed for sustained performance in high-traffic commercial settings. At its core, the hydraulic mechanism utilizes a specialized fluid within a cast iron body, precisely regulated by adjustable valves. These valves allow for independent fine-tuning of the closing speed (from full open to approximately 15 degrees) and the latching speed (the final 15 degrees of closing). This precision in fluid dynamics ensures a controlled, consistent closing action, critical for user safety and door longevity.
Durability is paramount, evidenced by the cast iron body's inherent strength and the extra-duty forged steel arms, which together contribute to an astounding 10,000,000 cycle test rating. This far exceeds typical commercial requirements, underscoring its long-term reliability. The integrated hydraulic back-check system provides critical protection by generating increasing resistance when the door is aggressively opened beyond a pre-set point, preventing damage to the door, frame, and surrounding structures.
Compliance with ANSI/BHMA A156.4 Grade 1 signifies that the LCN 4510-7351 has undergone rigorous, third-party testing for strength, reliability, and functionality under extreme operational conditions, making it suitable for the most demanding applications. Furthermore, its UL Listing confirms compliance with recognized safety standards. While engineered for superior control and durability, it is crucial to acknowledge that this specific model is not fire-rated, nor does it incorporate delayed action or hold-open features, focusing purely on precise, non-interrupted closing control. The adjustable power sizing (1-6) or pre-sized options ensure optimal force output for a wide range of interior door dimensions, promoting accessibility where applicable in accordance with BAA & ADA guidelines.
Technical Support & FAQs
Engineering Analysis
The LCN 4510-7351 embodies robust engineering principles, meticulously designed for sustained performance in high-traffic commercial settings. At its core, the hydraulic mechanism utilizes a specialized fluid within a cast iron body, precisely regulated by adjustable valves. These valves allow for independent fine-tuning of the closing speed (from full open to approximately 15 degrees) and the latching speed (the final 15 degrees of closing). This precision in fluid dynamics ensures a controlled, consistent closing action, critical for user safety and door longevity.
Durability is paramount, evidenced by the cast iron body's inherent strength and the extra-duty forged steel arms, which together contribute to an astounding 10,000,000 cycle test rating. This far exceeds typical commercial requirements, underscoring its long-term reliability. The integrated hydraulic back-check system provides critical protection by generating increasing resistance when the door is aggressively opened beyond a pre-set point, preventing damage to the door, frame, and surrounding structures.
Compliance with ANSI/BHMA A156.4 Grade 1 signifies that the LCN 4510-7351 has undergone rigorous, third-party testing for strength, reliability, and functionality under extreme operational conditions, making it suitable for the most demanding applications. Furthermore, its UL Listing confirms compliance with recognized safety standards. While engineered for superior control and durability, it is crucial to acknowledge that this specific model is not fire-rated, nor does it incorporate delayed action or hold-open features, focusing purely on precise, non-interrupted closing control. The adjustable power sizing (1-6) or pre-sized options ensure optimal force output for a wide range of interior door dimensions, promoting accessibility where applicable in accordance with BAA & ADA guidelines.