HD Front Mount Countertop L Bracket

Our HD Front Mount Countertop L Bracket delivers heavy-duty, worry-free support for granite countertop overhangs extending from kitchen islands, cabinet bases, knee walls, pony walls and more. Engineered with a welded center gusset that eliminates bracket flex, each bracket carries up to 350 lbs. so you can confidently support even the heaviest stone, quartz, or concrete surfaces knowing the support beneath is as solid as the countertop itself. The low-profile front-mount design keeps brackets tucked neatly beneath your countertop for a clean, professional look, and the straightforward installation means both seasoned contractors and first-time DIYers can get the job done right with nothing more than a drill and the included hardware.

Built for Strength, Designed for Simplicity. Our brackets are forged from solid 1/4" thick A-36 HRPO American Steel, the same heavy-duty structural-grade material used in commercial and industrial applications. The welded 1/4" center gusset is the difference between a bracket that flexes and one that doesn't. Under load, this bracket stays perfectly rigid, no sagging, no shifting, no movement. Period. Available in five sizes from 10" to 20" deep and finished in durable Matte Black or White powder coat. The HD Front Mount Countertop L Bracket handles granite, quartz, concrete, natural stone, wood, Formica, and every other countertop material you can put on top of it.

Specifications at a Glance:

• Material: Solid 1/4" A-36 HRPO American Steel with 1/4" Welded Center Gusset
• Width: 2.5"
• Sizes: 10" x 6", 14" x 7", 16" x 9", 18" x 10", 20" x 12" (Depth x Height)
• Mounting Holes: 12 pre-drilled holes per bracket - 6 rear countersunk holes (Ø.270") for #14 x 2½" Phillips Flat Head Wood Screws (included), plus 6 top through-holes for optional countertop fastening (hardware not included)
• Finish Options: Matte Black powder coat, White powder coat
• Load Capacity: 350 lbs per bracket

Important Note on Load Capacity: The stated carrying capacity of 350 lbs per bracket is achieved only when the bracket is properly mounted to a solid, structurally sound substrate using the included hardware. Brackets must be anchored into robust materials like 2x4 or 2x6 lumber framing or 2x12 backing ensuring adequate embedment. Fasteners should be torqued to a firm, secure hold, avoid over-torquing, which could compromise the integrity of the substrate or the fastener itself. Always follow the installation guide and consult a professional for load-bearing applications or if you are unsure about your substrate's capacity.

Key Product Advantages:

• Heavy-Duty Support: The welded 1/4" center gusset provides rigid, structural-grade support that eliminates bracket flex so your countertop stays perfectly stable under load.
• Exceptional Load Capacity: Each bracket supports up to 350 lbs when properly installed, with FEA-validated structural analysis confirming the bracket remains within the elastic range of the steel at rated load.
• Premium American Steel: Crafted from solid 1/4" A-36 HRPO American Steel for maximum longevity and structural integrity, this is not lightweight imported sheet metal.
• Durable Finish Options: Available in Matte Black and White industrial powder coat finishes that resist chipping, fading, and corrosion for lasting performance in kitchens, outdoor bars, and commercial environments.
• Fast & Reliable Delivery: In-stock brackets ship the same business day when ordered before 12:30 PM CST. Free ground shipping to the contiguous US.
• Direct from Manufacturer Value: Benefit from unmatched quality and competitive pricing when you buy direct from Iron Supports in Sheboygan, WI. no middleman markups, no importer quality concerns. American-made, American-shipped, American-supported.

Ideal Applications & Uses:

• Support countertop overhangs on kitchen islands and cabinet bases.
• Support countertop overhangs on knee walls and pony walls.
• Raised bar and breakfast bar countertop support.
• Outdoor kitchen and BBQ island countertop support.
• Supports for granite, quartz, natural stone, concrete, wood, Formica, porcelain, and all other countertop materials.
• Perfect for both new construction and retrofit installations where a strong, low-profile front-mount bracket is needed.

Tech & Install Document Files:

• Installation Instructions
• Download Installation Guide (PDF)
• Download Tear Sheet (PDF)
• Download Size & Quantity Guide (PDF)
• Download Spec Drawings (PDF):  10×6  •  14×7  •  16×9  •  18×10  •  20×12
• Download FEA Report (PDF)
• For Designers/Architects: Access .CAD, .STEP, .DWG files and more for your drafting software by signing up on our Contractor Plus+ page here.
• Questions? Contact our expert team at hello@ironsupports.com or (888) 971-3771. We're here to help you get the perfect solution for your project.

Size & Quantity Guide

Our recommendations meet or exceed the general guidelines provided by the Natural Stone Institute (formerly MIA) for safe and effective countertop support. While natural stone and exotic materials can be unpredictable, and man-made solid surface tops may require less support, our recommendations, based on extensive experience, offer a higher level of structural integrity and peace of mind compared to the minimum guidelines for unsupported overhangs.

What Size Bracket Should I Use?

Ideally you want no more than 3" of unsupported countertop extending past the end of your bracket. Here's how to figure it out:

• Measure Your Countertop Overhang: Determine the depth of your countertop overhang — the distance from the face of your cabinet or wall to the front edge of the countertop. (e.g., 19 inches).
• Subtract Your Bracket Setback: Allow 3" of countertop to extend past the end of the bracket.
• Select Your Bracket Size: Choose the bracket depth closest to your result.
  • Example: For a 19" countertop overhang:
  • 19" Overhang − 3" setback = 16"
  • Recommended Bracket Size: 16" x 9"
• Available Sizes: 10" x 6", 14" x 7", 16" x 9", 18" x 10", 20" x 12"

Note: Our brackets are listed as depth x height measurements. The first number (depth) supports your countertop horizontally. The second number (height) mounts to the wall or cabinet face vertically.

Quick Bracket Size Guide

How Many Brackets Do I Order?

For optimal stability and weight distribution, these brackets should be placed every 16 to 24 inches apart, ideally aligning each one with a wall stud for maximum strength. To figure out exactly how many you need:

• Step 1: Place End Brackets — Install one bracket 4" in from each end of your countertop. (This accounts for 8" of total width.)
• Step 2: Measure the Remaining Span — Subtract 8" (the space used by the two end brackets) from your total countertop width.
• Step 3: Divide by Your Desired Spacing — Divide the remaining span by your chosen bracket spacing (16" or 24"). Drop the decimal — the whole number is how many additional brackets you need. The decimal remainder just means your actual spacing will be slightly tighter than the target, which is always the safer direction.
• Step 4: Add It All Together — Add the 2 end brackets to the number from Step 3.

Example: For an 84" wide countertop with 16" bracket spacing:

• 84" − 8" (end brackets) = 76" remaining span
• 76" ÷ 16" = 4.75 → drop the decimal = 4 additional brackets
• 2 end brackets + 4 additional = 6 brackets total

Recommended Bracket Quantity Table

Size & Quantity Video Guide

Installation Video