NRH
Jewelry Box Corner Protector 28mm Chrome Plated Small Case Hardware
SKU: 7401-28-FE-CR
In Stock
Quick Specifications
| SKU | 7401-28-FE-CR |
|---|---|
| Weight | 7 g |
| Dimensions | 28x28x0.5 mm |
| Material | Cold-Rolled Carbon Steel (SPCC) |
| Origin | China |
| Certification | CE, ISO9001, UL, SGS, RoHS |
| MOQ | 1 |
| Lead Time | 7-30 days |
| Sample | Available |
Unit Price
US $0.15
/ unit
Min. Order: 1
Factory Direct
ISO Certified
Global Shipping
Triangle Corner Protector for Small Cases - 28mm Chrome Plated 3 Holes
Here's the problem: You spend hours building a beautiful jewelry box, a premium gift box, or a customized cosmetic case - then the corners are the first thing to wear. They chip, they rub, they split. And by the time you notice, the entire box looks used.
You might have tried using plastic corners - but they crack, they yellow, and they send the wrong signal about quality. Or maybe you've been leaving corners unprotected, accepting that returns and customer complaints are just "part of the business."
The NRH 7401-28-FE-CR solves this. It adds a thin, durable metal layer to the most vulnerable part of your box - not an add-on, but an integrated protection system that keeps your boxes looking new longer. Your customers notice the difference. Your return rate drops. Your products feel more premium from the moment they're opened.
Quick Answer: The NRH 7401-28-FE-CR is a lightweight chrome plated triangle corner protector with 3 mounting holes and 28mm face length. At just 7g with 0.5mm thickness, it features a smooth surface with no embossed groove. Designed for small cases, jewelry boxes, cosmetic cases, and lightweight applications.
How to know if the 28mm triangle corner is right for your box:
☑️ Measure your box wall thickness
Panels under 10mm → 22mm model works. Panels 10-15mm → choose 28mm for full edge coverage without gaps.
☑️ Consider your box size
Small box (under 100mm) → 22mm is more proportionate. Medium box (150-250mm) → 28mm looks balanced and substantial.
☑️ Think about your finishing style
Modern/minimalist → smooth chrome (7401-28-FE-CR). Antique/vintage → embossed groove (7401-28-1-FE-CR) for a decorative accent.
☑️ Check your weight tolerance
At 7g per corner, eight corners add only 56g. If you're air-shipping, this matters. If weight isn't a concern, you can size up to 35mm.
Key Finding: At just 7g with 28mm face length, the 7401-28-FE-CR offers slightly larger coverage than the 22mm model while maintaining ultra-lightweight performance. The smooth surface (no embossed groove) provides a clean, minimalist aesthetic, making it ideal for premium small cases, jewelry boxes, and cosmetic packaging where both protection and appearance matter.
● In Stock
✓ No Minimum Order
⚡ Ships Same Day
What Makes This Triangle Corner Protector Different
Ultra-Lightweight - Just 7g
At only 7 grams with 0.5mm thickness, the 7401-28-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.
Smooth Surface - Clean, Minimalist Aesthetic
This model features a smooth surface with no embossed grooves or markings - a clean, minimalist finish that suits premium jewelry boxes, cosmetic cases, and gift packaging. The smooth surface also makes it easier to clean and maintain.
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?
Feature
Triangle Corner (7401-28-FE-CR)
Standard Flat Corner (7201 Series)
Weight
7g - ultra-lightweight
20-45g - heavier
Face Length
28mm - compact
35-50mm - larger
Thickness
0.5mm - ultra-thin
0.8-1.0mm - standard
Hole Diameter
Ø3.5mm - for small fasteners
Ø4-4.3mm - for standard fasteners
Surface
Smooth - no embossed grooves
Smooth or with dimples/dots
Best For
Small cases, jewelry boxes, cosmetic cases, gift packaging
Standard cases, tool boxes, flight cases
When to Choose This Smooth 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 need a clean, minimalist appearance. The smooth surface with no embossed grooves provides a refined look that enhances premium products like jewelry boxes and gift packaging.
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
7401-28-FE-CR (This Model)
Model7401-28-FE-CR
MaterialMild Steel
FinishChrome Plated
Weight7g
Face Length28mm
Thickness0.5mm
Holes3×Ø3.5mm
SurfaceSmooth (no embossed groove)
7401-28-1-FE-CR (Comparison)
Model7401-28-1-FE-CR
MaterialMild Steel
FinishChrome Plated
Weight7g
Face Length28mm
Thickness0.5mm
Holes3×Ø3.5mm
SurfaceEmbossed groove
Data based on engineering drawing 7401-28-FE-CR. For reference only - not for mold making.
Applications
Jewelry Boxes
Why this model fits: The smooth chrome surface keeps the focus on your jewelry, not the hardware. At just 7g, it won't tip a lightweight box. The 28mm length provides full edge coverage for boxes up to 200mm without looking oversized. 3-hole fixation ensures the corner stays aligned during frequent opening and closing.
Cosmetic Cases
Why this model fits: Frequent handling means corners take a beating. The 0.5mm steel and chrome plating resist daily wear from hands, tabletops, and storage shelves. The smooth surface wipes clean easily - important for cosmetic packaging that may get product residue on it.
Gift Boxes & Premium Packaging
Why this model fits: Customers perceive boxes with corner hardware as more premium. The triangle shape adds a subtle structural accent that signals quality. The 28mm size looks substantial without overpowering the box. Chrome finish conveys durability and attention to detail - your recipients notice.
Mini Instrument Cases
Why this model fits: Harmonicas, flutes, and small instruments need protection without bulk. The 28mm corner adds a layer of metal protection at the exact point where cases get dropped - the corners. At 7g, it doesn't affect portability. Chrome finish resists scratches from other gear during transport.
What Are You Using Now?
If you're currently using no corner protection or plastic corners, upgrading to steel chrome corners is one of the lowest-cost ways to significantly improve your product quality perception and reduce corner damage returns.
No Corner
Protection
❌
Edges wear quickly
Looks unprofessional
Permanent damage
High return rate
Plastic Corner
⚠️
Cracks on impact
Can yellow or warp
Mixed quality signal
Medium return rate
Chrome Steel
✅
Full metal protection
25+ year durability
Premium quality signal
Low return rate
The bottom line: A chrome steel corner is a one-time investment that pays for itself in fewer returns, higher customer satisfaction, and a more premium product image. At under $1 per corner, it's the smallest cost that makes the biggest visual difference.
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-FE-CR the preferred choice for applications requiring a slightly larger smooth corner with clean aesthetic.
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.
- 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
- Smooth surface - no embossed grooves, clean minimalist aesthetic for premium products
- 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.
| Brand | NRH |
|---|---|
| SKU | 7401-28-FE-CR |
| Weight | 7 g |
| Dimensions | 28x28x0.5 mm |
| Material | Cold-Rolled Carbon Steel (SPCC) |
| Country of Origin | China |
| Certifications | CE, ISO9001, UL, SGS, RoHS |
| Minimum Order Quantity | 1 |
| Production Lead Time | 7-30 days |
| Stock Status | In Stock |
Triangular & Rounded Corner Protectors Applications
Widely used across industries - from industrial manufacturing to specialized fields, delivering reliable hardware solutions.
Manufacturing & Industrial
Metal corner protectors for equipment cases, preventing impact damage and extending case service life.
Automotive & Transportation
Metal corner protectors for transit cases, absorbing impact during loading and unloading operations.
Logistics & Warehousing
Metal corner protectors for storage cases, preventing damage from stacking and collision in warehouses.
Construction & Engineering
Metal corner protectors for toolboxes, withstanding impacts on construction sites.
Mining & Resources
Steel corner protectors for mining equipment cases, providing protection in harsh environments.
Aerospace
Lightweight metal corner protectors for aviation cases, impact-resistant without adding weight.
Marine & Offshore
Stainless steel corner protectors for marine cases, resisting saltwater corrosion at sea.
Defense & Military
Reinforced metal corner protectors for military cases, proven in battlefield impact conditions.
Audio & Entertainment
Metal corner protectors for stage equipment cases, protecting against impacts during tour transport.
Broadcast & Media
Metal corner protectors for broadcast equipment cases, protecting against impact during field deployment.
Photography & Film
Metal corner protectors for camera cases, safeguarding valuable equipment during outdoor shoots.
Agricultural Equipment
Weather-resistant metal corner protectors for farm equipment cases, built for outdoor exposure.
Fire & Safety
Metal corner protectors for fire equipment boxes, withstanding impact during emergency deployment.
Rail & Transit
Metal corner protectors for railway equipment cases, absorbing vibration impact during transit.
Water Treatment
Corrosion-resistant metal corner protectors for water treatment equipment, durable in humid environments.
What size corner protector do I need for a small wooden box or jewelry box?
For small wooden boxes, jewelry boxes, and gift boxes, a 28mm face length corner protector like the NRH 7401-28-FE-CR is the ideal size. It provides balanced coverage - larger than 22mm models for better edge protection, but compact enough to maintain the aesthetic of small boxes. If your box has thin walls (under 10mm), the 0.5mm thickness and 3.5mm mounting holes ensure secure installation without splitting the wood. For larger flight cases or heavy-duty equipment boxes, consider the 7201 series with longer face lengths.
Is 0.5mm steel thick enough to protect my boxes?
Yes - for lightweight applications such as jewelry boxes, gift boxes, cosmetic cases, and small instrument cases, 0.5mm mild steel provides sufficient reinforcement without adding unnecessary weight. The chrome plating adds surface hardness and corrosion resistance, protecting against daily wear and minor impacts. For heavy-duty applications like flight cases, industrial tool boxes, or equipment that undergoes frequent rough handling, we recommend the 7201 series with 0.8-1.0mm thickness
How do I install a triangle corner protector on a box?
Installation is simple and takes under 3 minutes per corner: Position the corner against the case edge - the triangle shape should sit flush against both adjoining faces Mark the hole positions using the 3 pre-drilled holes (Ø3.5mm) as a guide Pre-drill with a 3.0mm bit (slightly smaller than 3.5mm for a tight fit, preventing wood splitting) Secure with small rivets, M3 self-tapping screws, or spot welding Pro tip: For thin panels, avoid over-tightening - this can strip the wood or damage the plating
What's the difference between smooth and embossed triangle corners?
The NRH 7401 series offers two surface options with identical dimensions: Feature 7401-28-FE-CR (Smooth) 7401-28-1-FE-CR (Embossed) Surface Smooth, no grooves Single embossed groove (decorative accent) Best for Minimalist, clean aesthetic Premium, decorative finishes Applications Jewelry boxes, gift boxes, modern packaging Antique boxes, vintage-style cases, premium gift boxes Both models share the same 28mm face length, 7g weight, 0.5mm thickness, and 3-hole Ø3.5mm design. Choose smooth for a clean look, embossed for a decorative accent
What's the difference between triangle corners and standard flat corners?
Feature Triangle Corner (7401-28-FE-CR) Standard Flat Corner (7201 Series) Weight 7g - ultra-lightweight 20-45g - heavier Face Length 28mm - compact 35-50mm - larger Thickness 0.5mm - ultra-thin 0.8-1.0mm - standard Hole Diameter Ø3.5mm - for small fasteners Ø4-4.3mm - for standard fasteners Best For Small cases, jewelry boxes, gift boxes, lightweight packaging Standard cases, tool boxes, flight cases Choose triangle corners for small, lightweight boxes where weight and aesthetics matter. Choose flat corners for larger cases and heavy-duty applications requiring maximum reinforcement
Our Manufacturing Capabilities
Factory & Production Scale
Production Process
Quality Control & Testing
Shipping & Transport Methods
