SKU: 81528031958

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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Description

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 PURCHASINGWhite River Hardwoods MDF Radius Corners Made in the USA 3 Econo Quarter Round SKU 3ECQ58 Accepts 5 8 Plywood 3 Radius 97 Length Double Refined MDF 4 1 4W 1 5 16D Ships LTL 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. Made in Fayetteville, AR The Only National MDF Radius Corner

White River Hardwoods · MDF Radius Corners · Made in the USA

3″ Econo Quarter Round

SKU 3ECQ58 · Accepts 5/8″ Plywood · 3″ Radius · 97″ Length

Double Refined MDF · 4 1/4″W × 1 5/16″D · Ships LTL


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.

Made in Fayetteville, AR · The Only National MDF Radius Corner Manufacturer in the USA

⚠ Contact Us Before Purchasing — Call 1-800-558-0119 to confirm availability & lead time

The 3″ Econo Quarter Round — a tighter radius for tighter spaces, in Double Refined MDF made in the USA.

Product Details

Dimensions & Specifications

SKU Profile Radius Accepts Width Depth Length
3ECQ58 Econo Quarter Round 3″ Radius 5/8″ plywood 4 1/4″ 1 5/16″ 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

⌒

Econo Quarter Round — 3″ Radius

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.

▣

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.

★

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.

⊞

Accepts 5/8″ Plywood

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.

Technical Specifications

Key Facts

Profile

Econo Quarter Round

Radius

3″

Accepts

5/8″ Plywood

Width

4 1/4″

Depth

1 5/16″

Length

97″

Material

Double Refined MDF

Lead Time

7–10 Business Days

Made In

Fayetteville, AR

Contact Us Before Purchasing

This SKU has limited availability. Please call 1-800-558-0119 or email [email protected] 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.

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 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.

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.

3ECQ58 — 3″ Econo Quarter Round Radius Corner. Contact us before purchasing for availability confirmation.


Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 81528031958

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4.0 ★★★★★
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Product Reviews
J
Verified Purchase
joshua nieves
Port Orchard, US
★★★★★ 5
Perfect for work
Color: Grey
Great quality office chair. Easy to put together as there is minimal assembly required with easy to follow instructions. The chair has many sitting options. Makes for a perfect chair to use all day long. Its an ergonomic chair that allows you to adjust tilt tension, arm rest height, chair height, and allows to actually move arm rest upward and out of the way. You can swivel and sway and roll around with ease. Perfect chair for sitting all day. The head rest provides great neck support and the padding is very comfortable and supportive. The wheels are strong and the entire chair is sturdy. Quality material, The cushion is made with memory foam as well as comfort foam. Such a quality chair. This is a great value for the money. I would recommend to anyone that sits for any period of time for work or otherwise .
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 15, 2026
F
Verified Purchase
fenglinyang
Charlottesville, US
★★★★★ 5
Great chair for everyday use
I’m really happy with this ergonomic chair. It was easy to put together and feels very sturdy once assembled. The mesh back is breathable and keeps my back cool even after sitting for hours. The seat cushion is comfortable and supportive, and the armrests are positioned well for working at a desk. I also like how smoothly the wheels roll and how easy it is to adjust the height. For the price, the quality is honestly better than I expected. I’ve been using it every day for work and it makes long sitting sessions much more comfortable. Definitely a great value and I would recommend it.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 10, 2026
A
Verified Purchase
Amazon Reviews
Fort Morgan, US
★★★★★ 5
Excellent quality, comfortable for 8+ hour days
Color: Grey, Color: Grey
Since the reviews here were so very helpful to me, I decided to leave my own after using this chair a couple days. To summarize: Overall, I am thrilled with this chair and would recommend! I work remote, in a small apartment and this works well for both space saving and silence when rolling over hardwood floors all day. For more details, read on! It came packaged very nicely, so everything was well protected during shipping. There are no written instructions and to be honest, I didn't even look for them. If you've put one together before, this is pretty standard. The "leather" (not genuine, but feels like it) is thick and seems it will be sturdy for a long time. The padding is exceptional and that's the main reason I needed a new chair, as mine (a 'basic' brand one, IYKYK) only lasted one year before it felt like sitting on a hard plastic seat. The height is adjustable to go up higher than most, so for once I didn't have to raise it all the way to feel comfy. The surprisingly great thing about it is the arms that flip up, so I can push it all the way under my desk. I live in a small apartment, so every bit of space saved is a bonus! Speaking of apartments, the wheels on this are whisper quiet and I'm more than certain the neighbor below me is thrilled to not hear my clunky wheels from the other chair anymore. I was hesitant to pay too much for an office chair, but given the price and the quality, I feel it was an excellent purchase. A few items to note, if you have never put one together before: hand tighten the screws first! Don't put them on full force, until the pieces have been mostly assembled. This will help it not come out lopsided and the holes will be a little easier to line up. Watch the video, it will make the process a little easier (unlike what I did - put the arms on correctly, thought that looked wrong, then put them on backwards and lost my mind LOL). The video will also show how to recline the chair, if you like that (I do). It has a recline that's smooth as butter.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 11, 2026
J
Verified Purchase
Julia
Houston, US
★★★★★ 5
Very comfortable and safe chair
This executive desk chair is very convenient , for its 90° flip-up armrests can be easily pushed under the desk, perfect for home office. The rubber wheels roll smoothly and quietly on my carpet. It supports up to 275 pounds so it is safe to me . The height-adjustable back with 360° swivel makes me move freely . The curved, padded backrest provides relieve back pressure , also it is very easy to set up.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 22, 2026
L
Verified Purchase
Lory Johnson
Draper, US
★★★★★ 4
Recommend it for all.
Color: Grey, Color: Grey
Very nice chair. One warning…it went together very easily except for the last screw!!! I finally gave up. A neighbor came over and gave up. My daughter came. Over and after much groaning and moaning got that last screw in.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 17, 2026

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