4 1/2″ Poly Spindle


A mid-size polyurethane baluster with a classic Colonial look.



Also called Polyurethane Balusters.  Actual Width: 4 1/2″.  Specify length/design.  Recommended On Center spacing is 6 1/4″.

Use with 7 1/4″ Polyurethane Rail System

Polyurethane balusters are reinforced with an internal PVC pipe, which extends 1″ from each end.

How long will my order take?
For CURRENT LEAD TIME and shipping transit time, click here.

QUANTITY DISCOUNTS are automatically applied in your shopping cart, starting at 100 pieces.

SHIPPING COST is displayed in shopping cart.  Enter Quantity and click “ADD TO CART”.

4″ Ball Rule: To meet most building code regulations, a 4″ ball can’t pass through the widest opening between balusters.  Purchaser must check for system suitability in their area.  American Porch, LLC. makes no guarantee of suitability on any specific application.

PL Premium Adhesive must be used on all bedding/butt joints.

Click Here for Warranty Information

Proudly made in the USA.

For Pros

Download Product Drawings:


Polyurethane Product Material

Our “poly” products are made from environmentally friendly water-based High Density Polyurethane (also called urethane, HDP, or simply Poly).  The material is similar in density to a softwood such as white pine.  Unlike PVC or Vinyl, our Poly material looks and feels like authentic wood.  Each pattern is made to exacting dimensions by our staff of Master Patternmakers.  The edges of Western Spindle Poly Products are sharp, clean, and offer the true authentic look and feel of wood.  It comes factory primed with a high emulsion latex paint that can be finish coated with any high quality exterior latex paint.

Polyurethane spindles are reinforced with an internal PVC pipe for strength and rigitity.  The rails are reinforced with either a PVC or Aluminum pipe.  Cut our Poly spindles and PVC-reinforced rails using normal woodworking techniques.  For rails with an internal aluminum pipe, a slow speed cutoff saw, a.k.a. multi-cutter, works best.

While many of our customers prefer the authenticity of wood, there is no question that urethane products have a few advantages.  Urethane is very low maintenance. The paint is chemically bonded during the molding process which prevents cracking and peeling. An additional primer is applied before shipping all orders. Urethane will not take on moisture, which allows it to withstand the environmental elements. It will not rot and is impervious to insects. Urethane simulates wood, is structurally sound and is the perfect enhancement for any of your building or remodeling projects.

All Western Spindle Poly products are made here in the USA.


Frequently Asked Questions:

How far apart should they be spaced to meet building codes?
To comply with the “4-inch ball rule”, space them every 6 1/4″ on center

How many balusters do I need?
Take the length of your rail (in inches) and divide by 6 1/4″
Example: 10′ of rail, which is 120″.  Take 120 divided by 6.25 = 19 needed.

What height of baluster do I need?
Using the 7 1/4″ Top & Bottom Rails and a 4″ toe space, the following top rail heights will be acheived:
16″ Spindle: 31″
20″ Spindle: 35″
24″ Spindle: 39″

How much does shipping cost?
SHIPPING COST is displayed in shopping cart.  Enter Quantity and click “ADD TO CART”.

How long will my order take?
For CURRENT LEAD TIME and shipping transit time, click here.

Still have questions?  Email us at [email protected] or call 888-459-9965 and we’ll be glad to help with your project.


Polyurethane Balustrade Installation Instructions

Care and Finishing of Poly Balustrade

You may also like…