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National Hardware 4.5 in. H X 1.5 in. W X 0.125 in. D Black Carbon Steel Flat Corner Plate

National Hardware 4.5 in. H X 1.5 in. W X 0.125 in. D Black Carbon Steel Flat Corner Plate

Introducing the National Hardware 4.5 in. H × 1.5 in. W × 0.125 in. D Black Carbon Steel Flat Corner Plate — a focused, high-strength solution for reinforcing 90-degree joints in f…

National Hardware MPN N351-504 In Stock & Ready to Ship
Local Price Check i Local stores may price this as low as $5.99. Our online price is $6.99.
$6.99
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Case of 5 · List Price $34.95
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Shop Local · Support Independent

Every order helps keep your local hardware store on the corner.

Why we built NHG
You might find it for less locally. Independent retailers often offer competitive pricing — some products are even cheaper in-store than online.
Real expert advice — not search results. Independent hardware staff know their inventory and the local conditions you're working in.
Keep the neighborhood working. Every dollar spent at an independent retailer returns roughly 3x more to your local economy than at a national chain.

About Product Overview

Introducing the National Hardware 4.5 in. H × 1.5 in. W × 0.125 in. D Black Carbon Steel Flat Corner Plate — a focused, high-strength solution for reinforcing 90-degree joints in furniture, cabinetry, and DIY builds. Built from solid carbon steel and finished in a matte black, this plate provides dependable support while staying discreet in your design.

Key specifications at a glance:

  • Brand: National Hardware
  • Corner Type: Flat
  • Material: Carbon Steel
  • Finish: Black
  • Size: 4.5 in (Height) × 1.5 in (Width) × 0.125 in (Thickness)
  • Package Quantity: 1 piece (bulk packaging)

What makes this flat corner plate stand out?

  • Low-profile silhouette (0.125 inch thick) keeps corners strong without altering the look of your project.
  • Carbon steel delivers lasting rigidity for repaired or newly joined corners that see everyday use.
  • The black finish blends with most hardware and furniture aesthetics, delivering a clean, seamless appearance.
  • Designed specifically for flat corner reinforcement, ideal when inside space is limited or you want a minimal footprint.

Ideal for:

  • Furniture repairs — reinforce tabletops, chests, bed frames, and dressers where corners bear weight or keep joints from loosening.
  • Cabinet and frame reinforcement — secure corner joints on cabinets, boxes, crates, and picture frames.
  • DIY projects that require a discreet, sturdy corner plate to maintain lines and edges.

Practical tips for use:

  • Align the plate precisely with the joint and use appropriate fasteners for your material and load; ensure fasteners do not protrude beyond the plate.
  • For best results, use the right-length fasteners to prevent wood splits or strip-out in delicate materials.
  • Wipe the plate with a dry cloth after installation to maintain the black finish and prevent fingerprints on the surface.

The Details Specifications

Brand National Hardware
SKU 5005975
UPC 886780006056
Unit 0
Case Pack Quantity 25 per case
Retail Unit Quantity 5
Unit of Measure 0 0
Dimensions (L × W × H) 5 × 5 × 1
Weight 2 lbs
Cubic Feet 0.00542 ft³
Country of Origin CHINA
Safety Data Sheet (SDS) Manufacturer documentation · opens in new tab

Ask our counter. Or theirs.

Most hardware stores can do more than you think. If we can't help you, the folks down the street probably can — just ask at the counter.

What we offer
Free Local Pickup Ship to your hometown store
Pro & Gov Accounts Net terms · tax-exempt
Ships Nationwide From our distribution network
Independent Network Real hardware stores
$0.68 of every dollar spent at a local independent business stays in the community. At a national chain, it's about fifteen cents. Civic Economics, multi-city retail studies
Their Counter
Try local first · we'll wait

The stores we send you to are local and independently run — often for generations, the kind of place where someone behind the counter knows the regulars. We don't own them. We just think they deserve the foot traffic. They can put most of what we sell on their next truck. Ask there before you check out here.

Find a local store →
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Independent hardware retailer? Join the network →
About our directory. National Hardware Group is an independent retailer and directory. The local stores we list and link to are separately owned and operated — we have no ownership stake in any of them, and most pay us nothing to be included. That includes plenty of stores flying a co-op banner that people don't realize are locally owned and run, not operated by a corporation. Store owners can choose to upgrade their listing for an enhanced presence or pickup features, but the base directory is free, and inclusion is never a paid endorsement.

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