Products > Climbing-Equipment > Extension Ladders > 5300-1 Series > 5312-1 12ft Type IAA Fiberglass Round Rung Straight Ladder > 5312-1

5312-1 Extension Ladders - Keller US
5312-1 Extension Ladders - Keller US


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5312-1 12ft Type IAA Fiberglass Round Rung Straight Ladder


SizeStyleApprox. Closed LengthReach HeightLoad Capacity

The 5312-1 one-section round rung 12ft Straight Ladder is made with non-conductive fiberglass rails. Easy to transport and maneuver, these ladders bear a duty rating of 375 pounds making them durable and long lasting. The slip-resistant rungs are round, and the durable rail shields and shoe brackets help to protect the rails from damage. The plate and rung assemblies are riveted at four points to the side rails.


  • Exclusive 3-piece rung-to-rail connection means twist-proof performance
  • 1-1/4in slip-resistant round rungs
  • Plate and rung assembly are riveted at four points to each side rail to allow for rung replacement
  • Rugged, heavy duty extruded rung locks are spring loaded to operate smoothly
  • Pre-pierced holes for easy field installation of accessories
  • Durable rail shield and shoe bracket protects rail from damage
  • Dual action feet with slip-resistant pad and spur plate for use on hard or penetrable surfaces
  • Mar-resistant molded end caps
  • Ideal for utility and telecommunication industries


FeatureSize / Details
Max. Safe Working Height12ft
Max. Open Extended Length12ft
Load Capacity350lb
Duty RatingType IAA Duty Rating
Rung TypeRound
Section x Rungs12
Number of Sections1
Base Width19in
CertificationsANSI A14.5 (2007); OSHA
Max. Load375lb
Approx. Closed Length144in
Reach Height14ft
Approx. Shipping Weight (lb)27.8
Approx. Product Weight (lb)27.8
Approx. Cu. Ft. Per Unit7

Package Contents

Part NumberQtyDescription


Rung Dimension15-1/3in x 1-1/4in

Additional 5300-1 Series Models

Model No.SizeMax. Safe Working HeightMax. Open Extended LengthDuty RatingSection x RungsBase Width
5308-18ft8ft8ftType IAA Duty Rating819in
5310-110ft10ft10ftType IAA Duty Rating1019in
5312-112ft12ft12ftType IAA Duty Rating1219in
5314-114ft14ft14ftType IAA Duty Rating1419in
5316-116ft16ft16ftType IAA Duty Rating1619in
5318-118ft18ft18ftType IA Duty Rating1817-5/8in

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 reach 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.

Performance system
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.