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Products > Climbing-Equipment > Extension Ladders > D500-2 Series > D520-2 20 ft Type IAA Aluminum D-Rung Extension Ladder > D520-2

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D520-2 20 ft Type IAA Aluminum D-Rung Extension Ladder

Performance Overview

SizeStyleApprox. Closed LengthReach HeightLoad CapacityPerformance Rating
20 ftMulti Section10 ft20 ft375 lbs

The D520-2 20 ft aluminum extension ladders have a duty rating of 375 pounds 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 pounds for 36 ft-48 ft models.


  • Exclusive ALFLO® rung joint means TWIST-PROOF® performance
  • 1-3/4 in slip-resistant TRACTION-TRED® D-rungs
  • Heavy Duty extruded rung locks are spring loaded to operate smoothly
  • Base and fly separate easily for use as an extension or two single sections
  • Smooth operating pulley design with 3/8 in rope
  • Internal guides increase ease of operation
  • Extra Heavy Duty I-beam rails
  • Rugged spring loaded locks operate smoothly
  • Heavy duty, self-aligning, free-swinging shoe with slip-resistant tread and replaceable steel spur plate
  • Mar-resistant end caps notched for easy separation of sections


FeatureSize / Details
Size20 ft
Max. Safe Working Height17 ft
Max. Open Extended Length17 ft
StyleMulti Section
Load Capacity375 lbs
Rung TypeD-Rung
Foot MaterialSlip-resistant pad
Number of Sections2
Base Width19-1/8 in outside Shoes
CertificationsANSI A14.2 (2007); OSHA
Approx. Closed Length10 ft
Reach Height20 ft
Approx. Shipping Weight Lbs.42
Approx. Cu. Ft. Per Unit8.8
Performance Rating

Package Contents

Part NumberQtyDescription


Rails Dimension3-1/4 in
Flange Dimension1-3/16 in
Rung Dimension1-3/4 in
Fly Width16-7/8 in

Additional D500-2 Series Models

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

How do I lower the ladder once extended?

Asked by: annlouise
The D520-2 is equipped with a rope and pulley system. By pulling the rope down this raises the fly section and disengages the locks. The ladder is then able to be lowered.
Answered by: Werner Customer Care
Date published: 2016-04-14


D520-20 LADDER
Asked by: BILL
Please contact our Customer Care Department when convenient at 888-523-3370 Monday through Friday 8 AM till 5 PM EST for further details on your issue and/or question.
Answered by: Werner Customer Care
Date published: 2014-11-18

how to order catches to lock railes in place & leave sections up &down

Asked by: picaro
Please visit our website at www.buywerneronline.com to order your desired replacement parts online. Contact our customer care department if you have any questions. Please have your model number and MK/MARK number available off of your ladder/accessory at the time of your call so we can provide the correct direction. Our customer service toll free number is 888-523-3370 Monday through Friday 8 AM till 5 PM EST.
Answered by: Werner Customer Care
Date published: 2014-11-18

Is there an operating listruction manual on line for the D520-2?

Asked by: annlouise
We do not have the operating instructions for the D520-2 available online.
Answered by: Werner Customer Care
Date published: 2015-11-24

What is "MT" Series?

In a previous question a customer asked what the country of manufacture is? Werner answer "MT" ladders are made in Mexico. How do we know what an "MT" series ladder is? The Model is series D500. Where are the D500 Type 1AA ladders made?
Asked by: S
The MT is made in China. You can go to the following website to view the MT series ladders. http://www.wernerco.com/us/en/results?s=mt The D500 series ladders are made in Juarez, Mexico.
Answered by: Werner Customer Care
Date published: 2016-06-24

What is the country of origin?

Asked by: Frank
The MT Series of ladders are manufactured in Mexico. In recent years Werner Co. has expanded globally to become the world leader in the manufacturing and distribution of ladders, climbing equipment and ladder accessories. Werner is now available in new markets and product categories and has added manufacturing and distribution facilities in the U.S. and around the world to satisfy global demand.
Answered by: Werner Customer Care
Date published: 2016-06-23

I want a ladder in jalore district .

Asked by: Vijay Kumar yadav
Please contact Customer Care at 888-523-3371 Monday through Friday from 8:00 AM to 5:00 PM EST.
Answered by: Werner Customer Care
Date published: 2017-08-04

product weight

i am trying to get the product weight of a 32 foot type IAA extra heavy duty industrial ladder with a rating of 375 pounds, this would include the levelers for the feet and the hooks for strand.
Asked by: Steve
The D532-2 weighs 74 lbs. If you add the PK80-2 Levelers, they weigh 9.5 lbs. The cable hooks will not work for model number D532-2.
Answered by: Werner Customer Care
Date published: 2017-06-06


Asked by: jack
Pricing and product are solely provided by distributors in your area. Please visit our website at www.wernerladder.com and utilize our distributor locator to identify the nearest distributors in your area.
Answered by: Werner Customer Care
Date published: 2016-10-04

How much does a 24ft. alumium ladder weigh?

Asked by: Blackie
74 lbs.
Answered by: Werner Customer Care
Date published: 2017-02-24
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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.