MDF Radius Corners, Econo Qtr Rnd (accepts 5/8" plywood), 3" Radius 4 1/4"W x 1 5/16"D x 97"L, Contact us for more information BEFORE PURCHASING

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.feature-grid,.specs-grid,.install-steps{grid-template-columns:1fr;} .feature-card:nth-child(odd){border-right:none;} .feature-card:nth-child(1),.feature-card:nth-child(2){border-bottom:1px solid var(--wr-rule);} .specs-section{margin:0 -24px 56px;padding:36px 24px;} } </style> <!-- HERO --> <div class="hero"> <div class="hero-inner"> <p class="hero-eyebrow">White River Hardwoods · MDF Radius Corners · Made in the USA</p> <h1>3″ <em>Econo Quarter Round</em> </h1> <p class="hero-sku">SKU 3ECQ58 · Accepts 5/8″ Plywood · 3″ Radius · 97″ Length</p> <p class="hero-sub">Double Refined MDF · 4 1/4″W × 1 5/16″D · Ships LTL</p> <div class="hero-rule"><br></div> <p class="hero-desc">A tighter 3″ radius in the Econo Quarter Round profile — for cabinetry and furniture where the 4″ radius is too wide for the design. Accepts 5/8″ plywood. Contact us before purchasing to confirm availability and lead time.</p> </div> </div> <div class="usa-banner"> <p>Made in Fayetteville, AR · The Only National MDF Radius Corner Manufacturer in the USA</p> </div> <div class="contact-banner"> <p>⚠ Contact Us Before Purchasing — Call 1-800-558-0119 to confirm availability &amp; lead time</p> </div> <div class="content"> <div class="pull-quote"> <p>The 3″ Econo Quarter Round — a tighter radius for tighter spaces, in Double Refined MDF made in the USA.</p> </div> <div class="sku-section"> <p class="section-label">Product Details</p> <p class="section-title">Dimensions &amp; Specifications</p> <table class="sku-table"> <thead><tr> <th>SKU</th> <th>Profile</th> <th>Radius</th> <th>Accepts</th> <th>Width</th> <th>Depth</th> <th>Length</th> </tr></thead> <tbody> <tr> <td><span class="sku-code">3ECQ58</span></td> <td><span class="sku-dims">Econo Quarter Round</span></td> <td><span class="sku-badge">3″ Radius</span></td> <td><span class="sku-dims">5/8″ plywood</span></td> <td><span class="sku-dims">4 1/4″</span></td> <td><span class="sku-dims">1 5/16″</span></td> <td><span class="sku-dims">97″</span></td> </tr> </tbody> </table> <p style="font-size:12px;color:var(--wr-ink-soft);margin-top:12px;font-style:italic;">* Material: Double Refined MDF. Lead time: 7–10 business days. Ships LTL — minimum $45 freight. Street address required for delivery.</p> </div> <p class="section-label">Why MDF Radius Corners</p> <p class="section-title">The Problem This Solves</p> <div class="feature-grid"> <div class="feature-card"> <div class="feature-icon">⌒</div> <h3>Econo Quarter Round — 3″ Radius</h3> <p>The 3″ Econo Quarter Round profile delivers a tighter radius transition than the 4ECQ58 — ideal for narrower cabinet runs, tighter furniture profiles, or design specifications that call for a more compact corner radius.</p> </div> <div class="feature-card"> <div class="feature-icon">▣</div> <h3>Double Refined MDF</h3> <p>Double Refined MDF machines cleanly, paints to a flawless finish, and holds its shape over time. No grain inconsistency, no void risk — just a consistent, dense substrate that takes primer and paint the way cabinetry demands. A surface indistinguishable from solid wood when properly primed and painted.</p> </div> <div class="feature-card"> <div class="feature-icon">★</div> <h3>Only National Manufacturer</h3> <p>White River Hardwoods is the only national manufacturer of MDF radius corners in the USA — made in Fayetteville, AR. Consistent quality, reliable availability, and a supplier that has been delivering to the cabinetry industry nationally for decades.</p> </div> <div class="feature-card"> <div class="feature-icon">⊞</div> <h3>Accepts 5/8″ Plywood</h3> <p>Engineered specifically for 5/8″ plywood box construction — the standard substrate for this profile. The plywood box butts cleanly into the radius corner without shimming, scribing, or custom fitting. One piece, right the first time.</p> </div> </div> </div> <div class="specs-section" style="padding-left:48px;padding-right:48px;"> <div style="max-width:860px;margin:0 auto;"> <p class="section-label">Technical Specifications</p> <p class="section-title">Key Facts</p> <div class="specs-grid"> <div class="spec-item"> <p class="spec-label">Profile</p> <p class="spec-value">Econo Quarter Round</p> </div> <div class="spec-item"> <p class="spec-label">Radius</p> <p class="spec-value">3″</p> </div> <div class="spec-item"> <p class="spec-label">Accepts</p> <p class="spec-value">5/8″ Plywood</p> </div> <div class="spec-item"> <p class="spec-label">Width</p> <p class="spec-value">4 1/4″</p> </div> <div class="spec-item"> <p class="spec-label">Depth</p> <p class="spec-value">1 5/16″</p> </div> <div class="spec-item"> <p class="spec-label">Length</p> <p class="spec-value">97″</p> </div> <div class="spec-item"> <p class="spec-label">Material</p> <p class="spec-value">Double Refined MDF</p> </div> <div class="spec-item"> <p class="spec-label">Lead Time</p> <p class="spec-value">7–10 Business Days</p> </div> <div class="spec-item"> <p class="spec-label">Made In</p> <p class="spec-value">Fayetteville, AR</p> </div> </div> </div> </div> <div class="content"> <div class="callout callout-warn"> <h3>Contact Us Before Purchasing</h3> <p>This SKU has limited availability. Please call <strong>1-800-558-0119</strong> or email <strong>sales@whiteriver.com</strong> before placing your order to confirm current stock, lead time, and freight details. We want to make sure this product is the right fit for your project before you commit.</p> </div> <p class="section-label">Installation</p> <p class="section-title">Working With Radius Corners</p> <div class="install-steps"> <div class="install-step"> <span class="step-num">1</span><div class="step-content"> <h4>Plan Your Layout</h4> <p>Determine the location and orientation of each radius corner. The piece is 97″ long — cut to your finished height. Mark cut lines accurately before cutting; MDF does not forgive mis-cuts at visible faces.</p> </div> </div> <div class="install-step"> <span class="step-num">2</span><div class="step-content"> <h4>Cut to Height</h4> <p>Cut with a fine-tooth carbide blade — MDF dulls blades quickly. Cut from the finish face to minimize tear-out. Support the full length when cutting to prevent binding and chipping at the cut line.</p> </div> </div> <div class="install-step"> <span class="step-num">3</span><div class="step-content"> <h4>Dry Fit First</h4> <p>The 5/8″ plywood box should seat cleanly into the radius channel. Dry fit before applying any fasteners or adhesive — confirm seating depth and check that the radius face is flush with adjacent cabinet faces.</p> </div> </div> <div class="install-step"> <span class="step-num">4</span><div class="step-content"> <h4>Fasten &amp; Secure</h4> <p>Secure with construction adhesive and finish nails or screws through the cabinet box. Pre-drill to avoid splitting. Set fasteners slightly below the surface — MDF fills cleanly and holds fasteners well when properly pre-drilled.</p> </div> </div> <div class="install-step"> <span class="step-num">5</span><div class="step-content"> <h4>Fill &amp; Prime</h4> <p>Fill all nail holes and seams with lightweight filler. Sand flush when dry. Apply a quality MDF primer before finish coats — MDF is highly absorbent and requires a sealing primer coat for a smooth, paint-ready surface.</p> </div> </div> <div class="install-step"> <span class="step-num">6</span><div class="step-content"> <h4>Finish to Match</h4> <p>Apply your chosen paint in thin, even coats over the primed surface. Two finish coats over primer is standard for a smooth painted cabinet finish. Sand lightly between coats with 220-grit.</p> </div> </div> </div> <div class="callout"> <h3>Always Prime MDF Before Finishing</h3> <p>MDF is highly absorbent at cut edges and faces. A quality MDF-specific or high-build primer is essential before any finish coat. A properly primed MDF radius corner paints to a finish indistinguishable from solid wood — skipping the primer step results in an uneven surface that requires significant additional work to correct.</p> </div> <div class="shipping-section"> <h3>Shipping — LTL Freight</h3> <p>MDF Radius Corners ship via LTL freight. Freight is calculated by destination with a <strong>minimum charge of $45</strong>. If actual freight exceeds $45, a separate freight invoice will be emailed after your order is placed.</p> <p><strong>Important:</strong> LTL delivery requires a physical street address. We are unable to deliver to APO/FPO addresses or PO Boxes. Estimated lead time is <strong>7–10 business days</strong> from order confirmation, subject to inventory availability.</p> </div> <div class="closing"> <p>3ECQ58 — 3″ Econo Quarter Round Radius Corner. Contact us before purchasing for availability confirmation.</p> <div class="closing-rule"><br></div> </div> </div>