White River Hardwoods · MDF Radius Corners · Made in the USA
4″ Econo Quarter Round
SKU 4ECQ34 · Accepts 3/4″ Plywood · 4″ Radius · 97″ Length
Double Refined MDF · 5 11/16″W × 1 11/16″D · Ships LTL
The 4″ Econo Quarter Round for 3/4″ plywood box construction. Same precise 4″ radius geometry as the 4ECQ58 — engineered for the additional depth required by 3/4″ plywood. Double Refined MDF, made in the USA.
The same trusted 4″ Econo Quarter Round geometry, engineered to accept 3/4″ plywood — the standard for most full-height cabinet construction.
Product Details
Dimensions & Specifications
| SKU |
Profile |
Radius |
Accepts |
Width |
Depth |
Length |
| 4ECQ34 |
Econo Quarter Round |
4″ Radius |
3/4″ plywood |
5 11/16″ |
1 11/16″ |
97″ |
* Material: Double Refined MDF. Lead time: 7–10 business days. Ships LTL — minimum $45 freight. Street address required for delivery.
Why MDF Radius Corners
The Problem This Solves
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Econo Quarter Round — 4″ Radius
The Econo Quarter Round profile at 4″ radius, engineered specifically for 3/4″ plywood box construction. The slightly deeper profile (1 11/16″ vs 1 5/8″) accommodates the additional plywood thickness without shimming or scribing.
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Double Refined MDF
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.
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Only National Manufacturer
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.
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Accepts 3/4″ Plywood
Engineered specifically for 3/4″ 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.
Installation
Working With Radius Corners
1
Plan Your Layout
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.
2
Cut to Height
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.
3
Dry Fit First
The 3/4″ 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.
4
Fasten & Secure
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.
5
Fill & Prime
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.
6
Finish to Match
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.
Always Prime MDF Before Finishing
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.
Shipping — LTL Freight
MDF Radius Corners ship via LTL freight. Freight is calculated by destination with a minimum charge of $45. If actual freight exceeds $45, a separate freight invoice will be emailed after your order is placed.
Important: LTL delivery requires a physical street address. We are unable to deliver to APO/FPO addresses or PO Boxes. Estimated lead time is 7–10 business days from order confirmation, subject to inventory availability.
4ECQ34 — 4″ Econo Quarter Round, 3/4″ Plywood. Precision radius corners made in the USA.
