MDF S4S Lumber 11/16" x 2-1/2"

Elevate your next trim, casing or millwork project with this precision-engineered MDF S4S (Smooth Four Sides) lumber. At 11/16" thick and 2-1/2" wide, it delivers uniform strength and stability—without the knots, grain or warping you’ll find in natural wood. Ideal for painting, staining or veneering, this versatile moulding material offers a consistently silky-smooth surface that accepts finishes beautifully.

Whether you’re crafting custom cabinetry, building window and door surrounds, or adding decorative profiles to furniture and walls, this MDF S4S stock lets you achieve professional results every time. Its straight, uniform edges make it a breeze to cut, rout and join, so you can focus on design details rather than material imperfections.

Key Features

• Smooth Four Sides (S4S) finish for a flawless, factory-ready look
• Consistent thickness and width minimize gaps and uneven joins
• Medium Density Fiberboard composition ensures warp-resistance
• Perfect for priming, painting or laminating
• Easy to machine, rout and handle with standard woodworking tools
• Environmentally responsible MDF—made from recycled wood fibers

⚠️ WARNING: Drilling, sawing, sanding or machining wood products can expose you to wood dust, a substance known to the State of California to cause cancer. Avoid inhaling wood dust or use a dust mask or other safeguards for personal protection. For more information go to www.P65Warnings.ca.gov/wood.