CL201-1 & CL201-1B 90° Fixed Stop Concealed Embedded Industrial Cabinet Hinges

CL201 series are professional concealed embedded hinges with 90-degree fixed opening stop, available in two material versions to meet different environment requirements: CL201-1 (Zinc Alloy, Nanometer Painted Finish) and CL201-1B (SUS304 Stainless Steel, Wiredrawing Brushed Finish). They adopt fully hidden embedded installation structure, with the entire hinge body recessed inside the cabinet frame and door, leaving no exposed hardware on the exterior. Equipped with 3 M5 external threaded studs for fast through-panel mounting and 1 auxiliary Φ7 positioning hole, they are widely used in electrical control cabinets, distribution boxes, server enclosures, instrument housings and all industrial equipment requiring clean seamless appearance.

Complete Technical Specifications

• Model Series: CL201-1 / CL201-1B
• Material Option 1: Die-cast Zinc Alloy (CL201-1) Surface: Nanometer Painting (matte finish)
• Material Option 2: SUS304 Stainless Steel (CL201-1B) Surface: Wiredrawing / Brushed finish
• Fixed Opening Angle: 90° mechanical stop
• Overall Height: 75mm
• Overall Width: 35.2mm
• Mounting Configuration: 3 × M5 external threaded studs + 1 × Φ7 positioning hole
• Embedded Depth: 17.5mm
• Structure Type: Fully concealed embedded hinge with 90° angle limit

1. Fully Concealed Hidden Installation Advantage

The core feature of CL201 series is their completely embedded structure. After installation, no hinge components are visible from the outside of the cabinet, creating a seamless, clean and premium appearance. This hidden design not only improves overall equipment aesthetics, but also enhances anti-tampering security by eliminating external prying points, and reduces dust and moisture accumulation on exposed hardware surfaces.

2. Two Material Grades for Full Scenario Coverage

• CL201-1 Zinc Alloy Version: Die-cast zinc alloy body with nanometer painting finish, cost-effective choice for indoor dry workshops, standard electrical rooms and non-corrosive industrial environments. Zinc alloy provides good strength and dimensional accuracy at lower procurement cost.
• CL201-1B SUS304 Stainless Steel Version: Premium SUS304 stainless steel construction with wiredrawing brushed finish, excellent resistance to rust, moisture, water splash and weak acid/alkali corrosion, suitable for outdoor cabinets, coastal salt fog atmosphere, food machinery and wet production workshops.

3. Built-in 90° Angle Limit Protection

Integrated mechanical stop mechanism strictly restricts maximum opening at 90°, effectively preventing over-swing that pulls internal wires, damages electrical components or scratches cabinet body. This safety design is especially important for electrical enclosures to protect internal circuits and devices.

4. M5 Stud Quick Through-Panel Mounting

Three M5 external threaded studs allow fast installation by tightening nuts from the back side of the cabinet panel, no need for tapping threads on thin metal plates. The Φ7 auxiliary positioning hole ensures precise alignment during assembly, greatly improving production line installation efficiency.

5. Precision Die-Cast / Stamped Construction

Zinc alloy die-casting and stainless steel precision stamping both deliver high structural rigidity, accurate dimensional tolerance and smooth rotation performance. The precision machined pivot shaft runs silently and durably for thousands of opening-closing cycles.

Core Selling Points

1. Fully Concealed Seamless Appearance No exposed hardware on cabinet exterior, premium clean look, enhanced anti-tampering security.
2. Two Material Options Economical zinc alloy for indoor standard use; premium SUS304 stainless steel for outdoor/corrosive environments.
3. Built-in 90° Safety Stop Prevents door over-rotation, protects internal wiring and electrical components.
4. M5 Stud Quick Mounting Fast through-panel installation with back nuts, no tapping required, high assembly efficiency.
5. Precision Durable Construction Smooth silent rotation, long service life, stable performance under frequent use.

Typical Application Scenarios

1. Low-voltage electrical distribution cabinets, PLC control boxes, inverter automation enclosures
2. Server racks, network communication cabinets, data center equipment housings
3. Outdoor waterproof junction boxes, solar power equipment, street light control boxes
4. Laboratory test instruments, medical device enclosures, clean room equipment
5. Food processing machinery, pharmaceutical production line cabinets, hygiene-grade equipment

Installation & Selection Guidelines

1. Material Selection Rule: Choose CL201-1 zinc alloy version for dry indoor only; select CL201-1B SUS304 for outdoor, high humidity, salt fog and corrosive sites.
2. Groove Preparation: Reserve matching embedded groove on cabinet door and frame according to hinge outline dimensions for flush installation.
3. Stud Matching: Drill 3 through holes for M5 studs and 1 Φ7 positioning hole on the cabinet panel, fasten with lock nuts from the back side for anti-loosening.
4. Load Suggestion: For wide or heavy door panels, install two CL201 hinges symmetrically for balanced load bearing.
5. Angle Confirmation: Fixed 90° opening only, cannot rotate to 180°, verify required opening range before bulk order.

Product Summary

CL201 series 90° concealed hinges provide a dual-material, cost-effective hidden installation solution for industrial electrical cabinets. Combining fully embedded seamless design, 90° safety angle limit, M5 stud quick mounting and two material grade options, they meet both indoor cost control and outdoor anti-corrosion durability demands, becoming a standardized premium hardware for enclosure manufacturers pursuing clean appearance and reliable performance.

CL201-1 CL201-1B 90 degree concealed cabinet hinge zinc alloy SUS304 hidden industrial hinge