Triangle Corner Protector 28mm Chrome Plated 3 Holes | NRH

Triangle Corner Protector for Small Cases - 28mm Chrome Plated 3 Holes

Applicable Buyers

• Small case and mini box manufacturers
• Jewelry box and gift box producers
• Cosmetic case and beauty packaging manufacturers
• Mini instrument case builders
• Medical kit and small cooler case manufacturers
• Premium packaging and display case producers

What Makes This Triangle Corner Protector Different

Ultra-Lightweight - Just 7g

At only 7 grams with 0.5mm thickness, the 7401-28-1-FE-CR is one of the lightest corner protectors in the NRH lineup. Designed for small cases, jewelry boxes, cosmetic cases, and lightweight packaging where weight is a critical factor. The ultra-thin material provides adequate corner reinforcement without adding unnecessary bulk - ideal for air-shipped products where every gram counts.

Embossed Groove Detail - Subtle Decorative Accent

This model features a single embossed groove on one face - a subtle decorative detail that distinguishes it from the smooth 7401-28-FE-CR. The embossed groove adds visual interest while maintaining the clean, professional appearance that suits premium packaging and cases.

28mm Face Length - Slightly Larger Coverage

At 28mm face length, this model offers slightly more coverage than the 22mm version while remaining compact enough for small cases. This provides a middle-ground option for cases that need a bit more reinforcement than the smallest size but don't require standard 35mm corners.

Triangle Geometry - Clean, Professional Finish

The triangle geometry provides a clean, balanced appearance that complements small cases and boxes. The symmetrical three-way design distributes stress evenly across all three faces, ensuring consistent reinforcement on every side of the corner. The three-hole fixation system (Ø3.5mm) ensures secure mounting on thin panels without splitting or cracking.

3-Hole Fixation System

Three mounting holes (Ø3.5mm) deliver secure fixation with minimal installation effort. Compatible with small rivets, self-tapping screws, or spot welding.

Triangle Corner vs. Standard Flat Corner: Which One Do You Need?

When to Choose This Triangle Corner

You're building small to medium cases. The 28mm face length offers slightly more coverage than the 22mm model, making it suitable for cases that need a bit more reinforcement while staying compact.

You want a decorative accent. The embossed groove adds visual interest without being overpowering - perfect for premium jewelry boxes, cosmetic cases, and gift packaging that require attention to detail.

Weight is critical. At just 7g, this corner adds virtually no weight to your product - ideal for lightweight designs and air-shipped products.

You're working with thin panels. The 0.5mm thickness and small 3.5mm mounting holes are designed for thin materials where standard corners would be too heavy or cause splitting.

Technical Specifications

Data based on engineering drawing 7401-28-1-FE-CR. For reference only - not for mold making.

Applications

Installation & Maintenance

Installation:

• Position the corner against the case edge
• Mark hole positions using the 3 holes as a guide
• Pre-drill with a 3.0mm bit (slightly smaller than 3.5mm for tight fit)
• Secure with small rivets, self-tapping screws, or spot welding

Maintenance & Storage:

• Wipe with a soft cloth and mild detergent
• Do not use thinners, strong acids, or strong alkalis - these damage the plating
• Store in dry, ventilated areas - avoid prolonged damp conditions

Proven in the Field

NRH triangle corners are trusted by manufacturers of small cases, cosmetic boxes, jewelry packaging, and mini instrument cases worldwide. The ultra-lightweight design (7g) and compact 28mm size make the 7401-28-1-FE-CR the preferred choice for applications requiring a slightly larger corner with decorative detail.

Common applications include:

• Jewelry boxes and presentation cases
• Cosmetic cases and beauty product packaging
• Mini instrument cases (harmonicas, flutes, small accessories)
• High-end gift boxes and product packaging
• Medical kit boxes and small cooler cases
• Display cases and exhibition boxes

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 cases. Verify dimensions, finish, and installation. When you're satisfied, order production quantities.

Same-day dispatch on payment confirmation.

Key Takeaways

• 28mm face length - slightly larger than 22mm model, more coverage while staying compact
• 7g weight - ultra-lightweight, virtually no added weight
• 0.5mm thickness - ultra-thin for mini and lightweight applications
• Embossed groove - subtle decorative accent on one face
• Triangle geometry - clean, balanced appearance, stress distribution across all three faces
• Chrome plated mild steel - corrosion protection with bright finish
• 3-hole fixation with Ø3.5mm holes - compatible with small rivets or screws
• Perfect for jewelry boxes, cosmetic cases, mini instrument cases, and gift packaging
• In stock - no minimum order, samples ship same day
• Customizable in stainless steel and 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.