English [Español]
United States [Change]

D500-2 Series Aluminum Multi Section Extension Ladders

>Series Callout
The D500-2 aluminum extension ladders have a duty rating of 375 lbs and feature the exclusive ALFLO® rung joint for a TWIST-PROOF® performance every time. The end caps are mar resistant and notched for easy separation of sections. Both the base and the fly sections can be used separately. Internal guides increase the ease of operation when raising and lowering. The feet are heavy-duty, self-aligning and free swinging for hard or penetrable surfaces. Rugged spring-loaded locks operate smoothly. TRACTION-TRED® D-rungs are slip resistant. Duty rating changes to 300 lbs for 36 ft-48 ft models.


  • Alflo rung joint for Twist-Proof performance
  • Heavy duty shoe with slip-resistant tread and spur plate
  • Interlocking side rails
  • Mar-resistant molded end caps
  • Modified I-beam rails
  • Removable section for use as a single ladder
  • Rope and pulley system
  • Rope clamp ties rope to rung
  • Slip-resistant Traction-Tred D-rungs
  • Spring loaded locks

Performance Overview

SizeStyleApprox. Closed LengthReach HeightLoad CapacityPerformance Rating
20 ft -- 48 ftMulti Section10 ft -- 24 ft20 ft -- 45 ft300 lbs -- 375 lbs4 -- 5


Rails DimensionFlange DimensionRung DimensionFly Width
3-1/4 in1-3/16 in -- 1-1/4 in1-3/4 in16-7/8 in -- 20-5/32 in


Model No.SizeMax. Safe Working HeightMax. Open Extended LengthLoad CapacityBase WidthApprox. Closed LengthBuy Online
D520-220 ft17 ft17 ft375 lbs19-1/8 in outside Shoes10 ft
D524-224 ft21 ft21 ft375 lbs19-1/8 in outside Shoes12 ft
D528-228 ft25 ft25 ft375 lbs19-1/8 in outside Shoes14 ft
D532-232 ft29 ft29 ft375 lbs19-1/8 in outside Shoes16 ft
D536-236 ft32 ft32 ft300 lbs19-1/8 in outside Shoes18 ft
D540-240 ft35 ft35 ft300 lbs19-1/8 in outside Shoes20 ft
D544-244 ft39 ft39 ft300 lbs20-1/8 in22 ft
D548-248 ft43 ft43 ft300 lbs20-1/8 in24 ft

Type IAA duty rating is for extension ladders up to 32 ft


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.