CL248-1A Steel 120° Spring-Loaded Bolt Detachable Hinge with White Zinc Plating

Full Technical Specifications

Model Number: CL248-1A
Overall Length: 60mm
Mounting Plate Dimensions: 36mm length × 5mm height
Maximum Opening Angle: 120°
Material: Solid steel (hinge body and pivot pin)
Surface Finish: White zinc plating (rust-proof, wear-resistant, clean industrial appearance)
Bolt Pin Diameter: Φ5mm (spring-loaded, retractable)
Door-Side Mounting: 2 pieces M4 threaded holes, center distance 20mm
Frame-Side Installation: Welded bracket (permanent welding fixation)
Side Profile Dimensions: 22.5mm total width, door panel thickness t=3mm, frame thickness 2.5mm, minimum clearance >2.5mm
Core Mechanism: Spring-loaded retractable bolt pin for tool-free door detachment

Core Product Features & Advantages

1 Spring-Loaded Retractable Bolt Pin for Instant Tool-Free Door Removal

The integrated spring-loaded bolt mechanism allows the Φ5 pin to be retracted by hand, enabling the entire cabinet door to be detached and reattached in seconds without any tools. The spring automatically returns the pin to the locked position when released, ensuring secure and reliable connection during normal operation. This design dramatically improves efficiency for cabinet transportation, on-site assembly, internal wiring inspection and routine maintenance.

2 Solid Steel Construction with White Zinc Plating

The entire hinge, including both the body and bolt pin, is fabricated from robust solid steel for excellent structural rigidity, impact resistance and load-bearing capacity. The uniform white zinc plating forms a protective layer that effectively resists oxidation, rust and surface abrasion, providing reliable performance in standard indoor industrial environments while maintaining a clean and professional appearance.

3 Controlled 120° Opening Angle

The 120-degree maximum opening angle is engineered to provide sufficient access for internal operations while preventing the door from over-rotating and colliding with adjacent equipment, walls or operators. This controlled opening range is ideal for standard electrical cabinets and industrial equipment enclosures where full 180° opening is not required or may cause interference.

4 Secure Dual-Mounting Configuration

The door side features 2×M4 threaded holes with 20mm center spacing for direct bolt mounting, while the frame side utilizes a welded bracket for permanent, high-strength fixation. This combination provides a robust and vibration-resistant installation suitable for heavy-duty industrial equipment, with the welded frame side eliminating the risk of screw loosening.

5 Compact Low-Profile Design

With a 60mm overall length, 36mm mounting plate and compact 22.5mm side profile, this hinge fits neatly on small and medium-sized equipment enclosures. The >2.5mm clearance and compatibility with t=3mm door panels and 2.5mm frame thickness cover standard sheet metal cabinet configurations.

6 Cost-Effective Solution for Standard Indoor Applications

As a steel-only variant with white zinc plating, CL248-1A offers the same innovative spring-loaded bolt detachment functionality at a more economical price point compared to stainless steel alternatives, making it the ideal choice for high-volume indoor electrical cabinet and industrial equipment projects where corrosion resistance requirements are moderate.

Application Fields

Electrical control cabinets, low-voltage distribution boxes, frequency converter enclosures and PLC equipment housings
Automation equipment protective doors, industrial test bench casings and machinery access panels
Communication equipment cabinets, indoor server boxes and signal transfer enclosures
Sheet metal tool cabinets, instrument test equipment casings and industrial console doors
Medical equipment housings, laboratory analytical instruments and environmental monitoring control boxes (indoor use)
Aluminum profile industrial frames, mechanical equipment maintenance hatches and test fixtures
High-volume electrical cabinet manufacturing projects requiring cost-effective quick-release hinge solutions
Applications requiring frequent tool-free door removal for maintenance and inspection

Installation & Maintenance Guidelines

Step-by-Step Installation Procedures

Determine the installation positions on both the cabinet door panel and the frame according to the dimension drawing
On the cabinet frame: position the welded bracket side of the hinge and weld it permanently to the frame, ensuring proper alignment and >2.5mm clearance
On the door panel: mark and drill 2 holes corresponding to the 2×M4 threaded holes at 20mm center spacing, then fasten the hinge body to the door with M4 bolts
Retract the spring-loaded Φ5 bolt pin by hand, align the door with the frame bracket, then release the pin to engage and lock the door
Test the 120° opening movement for smooth rotation and verify the bolt pin detachment/engagement function
Confirm that the door closes properly and the bolt pin automatically locks in position when released

Installation Quantity Recommendation

Door height ≤500mm: Install 2 hinges symmetrically
Door height 500mm to 800mm or medium-weight steel door: Install 3 hinges for balanced load distribution

Maintenance Instructions

Suitable for indoor dry environments; not recommended for long-term outdoor exposure, high-humidity areas, coastal salt spray or severe chemical vapor conditions
Wipe the white zinc plated surface periodically with a soft dry cloth to remove dust, grease and moisture
Apply a small amount of dry lubricant to the spring-loaded Φ5 bolt pin mechanism every six months to maintain smooth retraction and rotation
Inspect the welded frame bracket quarterly for any signs of cracking or loosening, especially on equipment subject to continuous vibration
Check the spring tension of the bolt pin annually; replace the hinge if the spring weakens and the pin no longer auto-locks securely
Inspect the white zinc plating annually for chips or scratches; touch up with zinc-rich paint if necessary to maintain rust protection

Product Summary

CL248-1A is a cost-effective 120° spring-loaded bolt detachable hinge fabricated from solid steel with white zinc plating on both the body and pin. Its tool-free retractable pin mechanism, welded frame installation, secure M4 threaded door mounting and compact design make it a highly efficient and economical hardware solution for electrical control cabinets, automation equipment enclosures, industrial machinery and high-volume indoor applications requiring frequent quick door removal for maintenance and inspection.

CL248-1A steel spring loaded bolt detachable hinge 120 degree white zinc plated 2-M4 mounting welded frame industrial cabinet equipment hinge