LCN 4210/4510 Smoothee® Series Closers

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


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 force adjustments.

Features & Benefits
Body Construction
  • Cast iron body
  • LCN patented “Green Dial” spring force 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 without with regular or fusible link arms for self-closing doors
  • Tested and certified under ANSI Standard A156.4, Grade 1

LCN 4210/4510 Smoothee® Series Closers

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