U-Shaped Picture Frame Corner Protector 53mm Black 3 Holes

U-Shaped Picture Frame Corner Protector - 53mm Black 3 Holes

What Makes This U-Shaped Corner Protector Different

U-Shaped Design - Full 360° Corner Protection

Unlike standard L-shaped corners that only protect two surfaces, the 7557-53-FE-BK2 features a U-shaped design that wraps completely around the material - protecting the front, back, and both edges of the corner. This provides full 360° protection for picture frames, photo albums, books, and display pieces.

53mm Coverage - Fits Standard Frames and Albums

With 53mm side length, this corner protector provides generous coverage for standard picture frames, photo albums, and books. The extended size ensures that corners are fully protected - no exposed edges, no gaps.

R23.5 Smooth Rounded Profile - Snag-Free, Professional Look

The generous R23.5 radius creates a smooth, flowing rounded profile that eliminates sharp edges and prevents snagging on shelves, display cases, and during handling. This refined appearance makes it look like an intentional design element rather than an add-on.

Black Painted Finish over Zinc-Plated Steel

The 7557-53-FE-BK2 features a durable black painted finish applied over a zinc-plated steel base. This dual-layer protection provides superior corrosion resistance - the zinc plating protects against rust, while the black paint provides a professional, non-reflective matte finish that blends seamlessly with dark frames, albums, and displays.

Designed for Thin Materials - Up to 5.9mm Thickness

This U-shaped corner protector is specifically designed for materials up to 5.9mm thick - standard picture frames, photo albums, books, and lightweight display pieces. The U-shaped design requires the material to fit within the 5.9mm opening to wrap completely around the corner.

Lightweight - Just 11g

At 11g per corner, four corners add only 44g to the total weight - lightweight protection that won't weigh down your picture frames, albums, or books. The 0.8mm steel provides durable protection without adding unnecessary bulk.

3-Hole Fixation

Three mounting holes (Ø5.9mm) deliver secure fixation with minimal installation effort. Compatible with M5 or M6 screws, rivets, or adhesive mounting for a clean installation.

U-Shaped vs. Standard L-Shaped Corner: What's the Difference?

Applications

What Are You Using Now?

If you're currently using paper corners, plastic corners, or no corner protection on your frames and albums, upgrading to steel corners provides durable, professional protection that lasts for years.

The bottom line: The 7557-53-FE-BK2 provides full 360° protection for picture frames, albums, books, and display pieces. The black finish blends seamlessly, and the smooth rounded profile prevents snagging. Suitable for materials up to 5.9mm thickness.

Installation & Maintenance

Installation:

• Slide the corner protector over the frame/album corner - the U-shaped design should wrap around all four sides
• Position flush against the edges
• Mark hole positions using the 3 holes as a guide
• Pre-drill with a 5.0mm bit (slightly smaller than 5.9mm for tight fit)
• Secure with M5 or M6 screws, small rivets, or adhesive mounting tape

Maintenance & Storage:

• Wipe with a soft cloth and mild detergent
• Do not use thinners, strong acids, or strong alkalis - these damage the paint
• Store in dry, ventilated areas - avoid prolonged damp conditions
• Avoid abrasive cleaners that could scratch the black paint finish

Proven in the Field

NRH corner protectors are trusted by frame makers, album manufacturers, bookbinders, and custom framing professionals worldwide. The 7557-53-FE-BK2 provides durable, professional corner protection with a black finish that blends seamlessly with dark frames and displays.

Common applications include:

• Picture frames - standard and custom sizes
• Photo albums and scrapbooks
• Large books and journals - bookbinding and restoration
• Display cases and exhibition frames
• Custom framing projects
• Vintage and antique book restoration
• Box corners, packaging, and photo corners

About NRH

NRH started manufacturing case hardware in 1996, with over 25 years of brand history.

Four product lines: latches, handles, hinges, and corner protectors. Over 3,000 product variations. OEM/ODM supported.

Certifications:

• National High-Tech Enterprise (2023)
• ISO 9001 Quality Management (2018)

Five production and distribution centers: Shanghai HQ, plus Beijing, Guangzhou, Zhengzhou, and Chongqing.

In Stock - No Minimum Order

No 500-piece minimum. No 100-piece minimum. Order 1 piece and we ship.

First-time buyers often need to test fit before committing. Order a few samples. Test them on your frames, albums, or books. Verify dimensions, finish, and installation. When you're satisfied, order production quantities.

Same-day dispatch on payment confirmation.

Key Takeaways

• U-shaped design - full 360° corner protection for picture frames, albums, and books
• 53mm side length - generous coverage for standard frames and display pieces
• R23.5 rounded profile - smooth, snag-free, refined appearance
• Black painted finish over zinc-plated steel - corrosion resistance with professional matte appearance
• 0.8mm thickness - durable steel protection at just 11g
• 3-hole fixation with Ø5.9mm holes - compatible with M5 or M6 fasteners
• Max material thickness: 5.9mm - designed for thin frames, albums, and books
• Perfect for picture frames, photo albums, books, display cases, custom framing, and box corners
• In stock - no minimum order, samples ship same day
• Customizable in alternative finishes upon request
• NRH manufacturing case hardware since 1996 - ISO 9001 certified

Contact Sales

Email: nrh-gz@nrh.cn
Phone: +86 180 1797 5137

For bulk pricing, customization, or sample requests, contact our sales team directly.

When inquiring, please provide: Model number + quantity + destination port.