Model 420

Sectional steel door model 420 is designed for heavy-duty use in a variety of commercial and industrial applications. The Model 420 door features a 2″ (51 mm) panel thickness, 16-gauge steel intermediate and end stiles, ribbed steel exterior and a white paint finish. This 20-gauge steel door is available in sizes up to 31´2″ (9500 mm) in width and 24´1″ (7341 mm) in height. Numerous options including weatherstripping, reinforced struts, movable center posts, and motor operation allow these heavy-duty doors to meet nearly any project requirements.


Standard max width

31’2″ (9500 mm)

Standard max height

24’1″ (7341 mm)


1 year limited

Nominal thickness

2″ (51 mm)

Exterior steel

20-gauge galvanized steel

Exterior surface


End stiles

16-gauge steel

Center stiles

16-gauge steel

Interior color


Back cover

26-gauge galvanized steel

Standard mounting

Angle mount

Standard track

2″ (51 mm)

Standard springs

10,000 cycle

Weather Stripping

Flexible PVC bottom with retainer


Manual pull rope


White baked on-polyester


Interior mounted slide lock

Door Options

Door Options

  • Electric operator or chain hoist
  • Bottom sensing edge
  • Full sash section with 1/8″ (3 mm) DSB, insulated; 1/8″ (3 mm) and 1/4″ (6 mm) acrylic
  • Individual lites with 1/8″ (3 mm) DSB; 1/8″ (3 mm) and 1/4″ (6 mm) acrylic; 1/8″ (3 mm) and 1/4″ (6 mm) polycarbonate; 1/8″ (3 mm) and 1/4″ (6 mm) tempered; 1/4″ (6 mm) wired
  • 3″ (76 mm) track
  • Bracket mounting (not available on full vertical door tracks)
  • Higher-cycle springs in 25k, 50k, 75k, 100k cycles
  • Exhaust ports
  • Jamb weather seals
  • Bottom strips; including: looped PVC weatherstrips, flexible PVC astragal weatherstrips, and double-contact weatherstrips
  • Reinforcing struts of roll-formed, galvanized steel
  • Movable center posts for 2″ (51 mm) or 3″ (76 mm) tracks that roll away, with automatic safety catches that prevent door closure when posts are removed
  • Tumbler keyed lock
  • Window Glazing Options
  • Impact Section Available


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