Hidden Granite Countertop L Bracket

Support a granite overhang with nothing showing underneath.

The Hidden Granite Countertop L Bracket sets into the top of your knee wall, pony wall, or cabinet header. The countertop covers it. Nothing hangs below the overhang: no bracket, no gusset, no shadow line.

It's cut from solid ½" A-36 American steel. That's twice the thickness of a standard countertop bracket. Four screws hold the top leg in a routed channel. Two more anchor the 4" back plate into the header or stud. The bracket becomes part of the framing.

Rated up to 325 lbs per bracket when installed per instructions. It carries granite, quartz, concrete, and wood.

Seven lengths, 10" to 22". Matte Black, White, or Raw Steel. Ships the same business day from Sheboygan, Wisconsin.

Installation is straightforward. Route a ½" channel, set the bracket, drive six included screws, level, and set the top. A contractor does it in minutes. A first-time DIYer does it with a drill, a router or chisel, and this guide.

Specifications at a Glance:

• Material: Solid ½" thick × 2.5" wide A-36 HRPO American Steel
• Profile: Hidden L bracket - 2.5" wide horizontal leg, 4" back plate, beveled tip
• Sizes: 10", 12", 14", 16", 18", 20", 22" (horizontal length)
• Mounting Holes: 6 countersunk holes per bracket (Ø0.260", 82°), 4 in the top leg and 2 in the back plate for the included 6× #14 × 2½" Phillips Flat Head Wood Screws
• Finish Options: Matte Black powder coat, White powder coat, Raw Steel
• Rated Working Load: 325 lbs per bracket on knee/pony wall installations · 300 lbs per bracket on cabinet-base installations, when installed per instructions (see note below)

Important Note on Load Capacity: Rated working load: 325 lbs per bracket on knee/pony wall installations · 300 lbs per bracket on cabinet-base installations - when installed per instructions: top-mounted with the horizontal leg fully bearing on the framing shown for your application, back plate anchored into the header and/or vertical stud, brackets spaced 16" to 24" on center, under evenly distributed static load. The rating assumes an evenly distributed static load; concentrated edge loads, such as leaning or sitting on a bar edge, require tighter bracket spacing. This bracket is not designed for front mounting - installing it in a front-mount position will result in failure. Brackets must be anchored into sound 2x4 or 2x6 framing or a 2x10 cabinet header with the included hardware; drive fasteners to a firm, secure hold without over-torquing. Always follow the installation guide and consult a professional for load-bearing applications or if you are unsure about your framing.

Key Product Advantages:

• Truly Hidden Support: The bracket routes into the top of the framing and sits flush under the countertop - no visible steel, no gusset, no bracket profile below the overhang.
• Twice the Steel: Solid ½" A-36 HRPO plate, not ¼" and not imported sheet metal, for maximum stiffness and longevity.
• Engineered Rating You Can Verify: Ratings are established by engineering calculation and confirmed by finite-element analysis for both mounting conditions - the reports are published below.
• Two-Point Anchoring: Four screws through the top leg and two through the 4" back plate into the header or stud tie the bracket into the structure in two planes.
• Durable Finish Options: Matte Black and White industrial powder coat that resist chipping, fading, and corrosion, plus Raw Steel for custom color matching.
• 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: 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 knee walls and pony walls.
• Support countertop overhangs on kitchen islands and reinforced cabinet bases.
• 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 new construction and remodels where the framing is open and a completely hidden support is wanted.

Tech & Install Document Files:

• Installation Instructions
• Installation Guide (PDF)
• Size & Quantity Guide (PDF)
• Tear Sheet (PDF)
• Spec Drawings (PDF): 10" · 12" · 14" · 16" · 18" · 20" · 22"
• Engineering Analysis (PDF): Pony / Knee Wall · Cabinet Base
• 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?

Because this bracket mounts into the top of your framing, part of its length is used up before it clears the finished face of the wall or cabinet. Ideally you want no more than 3" of unsupported countertop extending past the end of the bracket. Here's how to figure it out:

• Measure Your Countertop Overhang: The distance from the finished face of your wall or cabinet to the front edge of the countertop (e.g., 15 inches).
• Add Your Mounting Depth: How much bracket is consumed before it clears the finished face — framing depth plus finish thickness on the overhang side. Use the table below.
• Subtract Your Bracket Setback: Allow 3" of countertop to extend past the end of the bracket.
• Select Your Bracket Size: Bracket Size = Overhang + Mounting Depth − 3", rounded up to the next available size.
  • Example: 15" overhang on a 2x4 knee wall with ½" drywall (4" mounting depth):
  • 15" + 4" − 3" = 16"
  • Recommended Bracket Size: 16"
• Available Sizes: 10", 12", 14", 16", 18", 20", 22"

Quick Bracket Size Guide

Find your countertop overhang in the left column, then read across to your installation type. The cell is the bracket size to order. (Every cell is just the formula above: Overhang + Mounting Depth − 3", rounded up.)

How Many Brackets Do I Order?

Brackets are typically spaced 16" or 24" on center to align with standard stud framing. Any spacing between 16" and 24" is acceptable for all countertop materials; maximum 24" on center. On a knee or pony wall, center each bracket on a vertical stud. 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