Sectional Steel Doors 426

Sectional steel door model 426 is ideal for heavy-duty applications requiring protection against the elements. These doors feature a 2" (51 mm) panel thickness, 16-gauge steel intermediate and end stiles, ribbed steel exterior and 26-gauge steel back cover in a white finish. Polystyrene insulation provides an R-value of 7.35. The Model 426 is a 24-gauge door available in sizes up to 28´2" (8585 mm) in width and 24´1" (7341 mm) in height and is also offered in Industrial Brown. A multitude of options including reinforcing struts, movable center posts, and motor operation allow these insulated heavy-duty doors to be used in a variety of commercial and industrial environments.


Standard max width
28'2" (8585 mm)

Standard max height
24'1" (7341 mm)

1 year limited

Nominal thickness
2" (51 mm)

Expanded polystyrene

7.35 (1.29 W/Msq)

Exterior steel
24-gauge galvanized steel

Exterior surface

End stiles
16-gauge steel

Center stiles
16-gauge steel

Interior color

Back cover
26-gauge galvanized steel (poly-bonded laminate, high impact polystyrene (HIPS) backed optional)

Standard mounting
Angle mount

Standard track
2" (51 mm)

Standard springs
10,000 cycle

Weather Stripping
Standard on bottom

Manual pull rope

White or Industrial Brown baked-on polyester

Interior mounted slide lock

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 1/2" (13 mm) DSB
  • 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

Exterior Color

  • white color swatch White

  • industrial brown color swatch Industrial Brown
Actual door color may vary slightly from the digital representation above.