CL248-1 120° Spring-Loaded Bolt Detachable Hinge — Steel (White Zinc Plated) / SUS304 (Ground Finish)

Full Technical Specifications

• Model Numbers: CL248-1 (Steel) / CL248-1S (SUS304)
• Overall Length: 60mm
• Mounting Plate Length: 36mm
• Maximum Opening Angle: 120°
• Material Options:
  • CL248-1: Carbon steel
  • CL248-1S: SUS304 stainless steel
• Surface Finish:
  • CL248-1: White zinc plating (rust-proof, wear-resistant)
  • CL248-1S: Precision grinding (satin metallic, corrosion-resistant)
• 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 2mm, 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 Dual Material Options for Versatile Application Requirements

Two material variants are available to match different environmental and budget needs: the CL248-1 carbon steel version with white zinc plating offers cost-effective rust protection for standard indoor industrial applications, while the CL248-1S SUS304 stainless steel version with precision grinding finish delivers superior corrosion resistance, salt spray endurance and a premium satin appearance for outdoor, coastal and harsh-environment installations.

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 2mm frame thickness cover standard sheet metal cabinet configurations.

6 Durable Surface Treatment for Long Service Life

The white zinc plating on the steel version provides effective oxidation and rust resistance for indoor workshop environments, while the precision grinding on the SUS304 version produces a consistent satin metallic finish that resists fingerprints, scratches and corrosion over years of service in demanding conditions.

Application Fields

1. Electrical control cabinets, low-voltage distribution boxes, frequency converter enclosures and PLC equipment housings
2. Automation equipment protective doors, industrial test bench casings and machinery access panels
3. Communication equipment cabinets, indoor/outdoor server boxes and signal transfer enclosures
4. Sheet metal tool cabinets, instrument test equipment casings and industrial console doors
5. Medical equipment housings, laboratory analytical instruments and environmental monitoring control boxes (SUS304 version recommended)
6. Outdoor monitoring equipment, weather-resistant instrument panels and coastal equipment enclosures (SUS304 version)
7. Applications requiring frequent tool-free door removal for maintenance and inspection

Installation & Maintenance Guidelines

Step-by-Step Installation Procedures

1. Determine the installation positions on both the cabinet door panel and the frame according to the dimension drawing
2. 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
3. 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
4. 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
5. Test the 120° opening movement for smooth rotation and verify the bolt pin detachment/engagement function
6. 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

1. Steel version (CL248-1): suitable for indoor dry environments; not recommended for long-term outdoor exposure, high-humidity areas or coastal salt spray
2. SUS304 version (CL248-1S): suitable for both indoor and outdoor environments, including damp, coastal and mildly corrosive conditions
3. Wipe the surface periodically with a soft dry cloth to remove dust, grease and moisture; for SUS304 version, avoid abrasive cleaners that may scratch the ground finish
4. Apply a small amount of dry lubricant to the spring-loaded Φ5 bolt pin mechanism every six months to maintain smooth retraction and rotation
5. Inspect the welded frame bracket quarterly for any signs of cracking or loosening, especially on equipment subject to continuous vibration
6. Check the spring tension of the bolt pin annually; replace the hinge if the spring weakens and the pin no longer auto-locks securely

Product Summary

CL248-1 is an innovative 120° spring-loaded bolt detachable hinge available in carbon steel (white zinc plated) or SUS304 stainless steel (precision ground finish). Its tool-free retractable pin mechanism, dual material options, welded frame installation and secure M4 threaded door mounting make it a highly efficient and reliable hardware solution for electrical control cabinets, automation equipment enclosures, industrial machinery and various applications requiring frequent quick door removal for maintenance and inspection.

CL248-1 steel SUS304 spring loaded bolt detachable hinge 120 degree white zinc plated grinding finish 2-M4 mounting industrial cabinet equipment hinge