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4210 / 4510 Smoothee® Series Closers

These heavy-duty, high-security and surface-mounted closers feature special components to resist tampering and vandalism.


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The heavy duty 4210/4510 Smoothee Series closers are high-security closers that feature special components to resist tampering and vandalism and meet ANSI/BHMA A156.4 Grade 1 standards. The closers are UL listed for self-closing doors and boast a 30-year limited warranty.

Forged steel parallel arms and heavy gauge metal security covers are designed for correctional, vandal-prone, institutional and other high traffic applications. A choice of finishes and cylinder functions meet correctional and vandal-resistant requirements. Materials include a high-strength cast iron cylinder, a one-piece forged steel piston, a double-heat-treated pinion, all-weather fluid, tamper-resistant regulating screws and a high-efficiency, full-complement, low-friction bearing. The LCN “Green Dial” ensures accurate spring power adjustments. 

Cast Iron

Surface Mounted

  Heavy Duty

Body Construction

  • Cast iron body
  • LCN patented “Green Dial” spring power indicator
  • Full-complement bearing

Quality and Durability

  • All-weather fluid
  • 30-year warranty
  • Handed design


  • Security cover
  • TORX machine screw pack
  • Forged steel arm
  • Sized cylinders for interior doors to 5’0” and exterior doors to 4’0”
  • Non-sized cylinder is adjustable for interior doors to 4’6” and exterior doors to 3’6”
  • Closer meets American Disabilities Act (ADA) requirements
  • UL and cUL listed for self-closing doors with regular or fusible link arms for self-closing doors
  • Tested and certified under ANSI Standard A156.4, Grade 1
  • Standard or optional custom powder coat finish
  • Standard handed cast iron closer
  • Standard handed heavy gauge metal security cover
  • Optional plated finish on metal cover, arm and fasteners
  • Optional SRI primer for installations in corrosive conditions is available with powder coat only
  • The 4210 Series mounts parallel arm push side.
  • The 4510 Series mounts hinge pull side.

Visit the 4210/4510 Series catalog pages for mounting details, arm options and accessories.

Need Replacement Parts?

Get the resources you need to get in touch with an Allegion team member for LCN replacement parts.


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Did You Know?

Double heat-treated pinions are used in LCN door closers to provide extra strength and reduce fatigue so that the hardware can deliver consistent performance and withstand high-abuse applications.

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As part of Allegion’s family of pioneering brands, LCN benefits from the strength, efficiencies, resources, and integration from a global power. In turn, we pass those advantages on to you.

Allegion helps keep people safe and secure where they live, work and visit. With more than 30 brands sold worldwide, we specialize in security around the doorway and beyond. It’s the power of one.