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500-1 Series Aluminum Single Section Extension Ladders

Series Callout
The 500-1 series are one-section round rung straight ladders with a duty rating of 375 lbs. The exclusive ALFLO® rung joint means TWIST-PROOF® performance every time. The side rails are extra heavy duty I-beam rails and the aluminum round rungs are deeply serrated for slip resistance. The duty rating goes to 300 lbs with the 18 ft, 20 ft and 24 ft lengths.


    Performance Overview

    SizeStyleApprox. Closed LengthReach HeightLoad CapacityPerformance Rating
    8 ft -- 24 ft Single Section 8 ft -- 24 ft 11 ft -- 26 ft 300 lbs -- 375 lbs 4 -- 5


    Rails DimensionFlange DimensionRung Dimension
    3 in -- 4 in 1-3/16 in -- 1-3/8 in 1-1/4 in


    Model No.SizeReach HeightMax Working LengthMax. Open Extended LengthLoad CapacityType Buy Online
    508-18 ft11 ft8 ft8 ft375 lbsType IAA Duty Rating
    510-110 ft13 ft10 ft10 ft375 lbsType IAA Duty Rating
    512-112 ft15 ft12 ft12 ft375 lbsType IAA Duty Rating
    514-114 ft17 ft14 ft14 ft375 lbsType IAA Duty Rating
    516-116 ft19 ft16 ft16 ft375 lbsType IAA Duty Rating
    518-118 ft20 ft18 ft18 ft300 lbsType IA Duty Rating
    520-120 ft22 ft20 ft20 ft300 lbsType IA Duty Rating
    524-124 ft26 ft24 ft24 ft300 lbsType IA Duty Rating

    Type IAA duty rating is for single ladders up to 16 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.