English [Español]
United States [Change]

T400 Series Aluminum Twin Step Ladders

>Series Callout
The aluminium Multi-Use Twin Stepladder T400 series has a duty rating of 375 pounds per side making these ladders ideal for one or two-person jobs. The tops are made of heavy gauge extruded aluminum, and the steps are connected with a solid double riveted construction. The extra wide TRACTION-TRED® steps are slip resistant. The bottom steps are braced with full U channel knee braces.


  • Aluminum top
  • Designed for one or two person jobs
  • Designed for one person jobs
  • Designed for two person jobs
  • Knee-braced top & bottom steps and horizontals
  • Slip-resistant foot pad
  • Slip-resistant Traction-Tred steps

Performance Overview

StyleSizeReach HeightLoad Capacity
Twin Stepladder4 ft -- 12 ft8 ft -- 16 ft375 lbs


Top DimensionFront Rails DimensionFront Flange DimensionRear Rails DimensionRear Flange DimensionSteps Dimension
8-1/4 in x 14 in3-1/8 in1-1/8 in3-1/8 in1-1/8 in3 in


Model No.SizeReach HeightMax. Standing HeightApprox. Product WidthApprox. SpreadApprox. Shipping Weight Lbs.Buy Online
T4044 ft8 ft1 ft 11 in21-1/4 in36-1/4 in21.5
T4066 ft10 ft3 ft 10 in24-3/4 in50-1/4 in31
T4088 ft12 ft5 ft 9 in28-1/4 in64-1/4 in42
T41010 ft14 ft7 ft 8 in31-3/4 in78-1/4 in55
T41212 ft16 ft9 ft 7 in35-1/4 in92-1/4 in69

Type IAA duty rating is for platforms ranging in size from 4 ft to 8'
Different types of ladders are designed to keep you safe and productive when climbing or standing. Using the wrong style of ladder or simply ignoring the limitations of climbing equipment can result in a fall or serious injury.
Height is referring to the actual ladder height. Extension ladders should be 7 to 10 feet longer than the highest support or contact point, which may be the wall or roof line. The highest standing level is four rungs down from the top. The highest permitted standing level on a stepladder is two steps down from the top.

Reach height is the maximum reach assuming a 5’6” person with a vertical 12” reach.
Ladders are designed to safely hold up to a specific amount of weight. The Werner Performance System defines five different capacities using a color and star rating system. The Duty Rating is defined as the maximum safe load capacity of the ladder. A person’s fully clothed weight plus the weight of any tools and materials that are carried onto the ladder must be less than the load capacity.

Werner offers ladder made from fiberglass and aluminum. Each material has characteristics which make it best for certain applications, or one material may simply fit the personal preferences of the user. For example, if working around electricity users should select fiberglass products due to their non-conductive side rails.