DC 420


  • Floor spring with fixed closing force for thin slabs
  • Certified in compliance with EN 1154, size 2-4, cycle test over 1,000,000 cycles
  • Suitable for fire and smoke protection doors
  • For double and single action door up to 100kg


  • Same dimensions for 3 bodies according to fix size EN2, EN3, EN4
  • Hydraulic control over 175° in both door swing directions
  • Adjustable door speed and latching speed from top regulating valves
  • Cast iron body
  • Adjustments in all directions within the cement box
  • Cement box in hot zinc plated
  • Cover plates and eyelets made in polished or satin stainless steel and polished brass
  • Interchangeable spindle from 0 to +30mm
  • Available with hold-opening angle 90°, 105° and without hold-open
  • For thin slabs