CL253-6 40×60mm SUS304 Stainless Steel 180° Mirror Polished Spring-Loaded Butt Hinge

Full Technical Specifications

• Model Number: CL253-6
• Overall Dimensions: 40mm total width (13mm + 13mm leaves + barrel) × 60mm height × 1.5mm leaf thickness
• Maximum Opening Angle: 180°
• Material: SUS304 stainless steel
• Surface Finish: Mirror polishing (highly reflective polished finish, corrosion-resistant, premium appearance)
• Pivot Pin Diameter: Φ5mm
• Integrated Mechanism: Built-in torsion spring for automatic door return / self-closing functionality
• Mounting Holes: 6 pieces Φ4.3 through holes (3 per leaf), 20mm vertical spacing, 13mm horizontal spacing
• Side Profile: 1.5mm leaf thickness
• Core Features: Integrated spring-loaded self-closing mechanism, full SUS304 corrosion resistance, mirror polished aesthetic, six-point mounting, 180° full opening

Core Product Features & Advantages

1 Integrated Spring-Loaded Self-Closing Mechanism

The built-in torsion spring integrated within the hinge barrel provides consistent automatic door return force, enabling self-closing functionality without the need for separate door closers, gas struts or magnetic catches. This ensures doors remain closed when not actively held open, improving safety, energy efficiency and equipment protection by preventing accidental door exposure to dust, moisture or unauthorized access.

2 Premium SUS304 Stainless Steel Construction

The entire hinge is fabricated from SUS304 stainless steel, providing excellent corrosion resistance, oxidation resistance and structural durability. Suitable for both indoor and outdoor environments, including damp, coastal and mildly corrosive conditions, it maintains reliable performance over years of service without rusting or degrading, even with the additional mechanical stress of the spring mechanism.

3 Mirror Polished Finish for High-End Aesthetic Appearance

The precision mirror polishing creates a highly reflective, sleek metallic surface that elevates the visual quality of any equipment enclosure. In addition to its premium appearance, the polished surface resists fingerprints, is easy to clean and provides an extra layer of corrosion protection, making it ideal for medical, laboratory, food processing and cleanroom applications where hygiene and appearance are critical.

4 180° Full Opening with Controlled Spring Return

The 180-degree maximum opening angle provides full unobstructed access for internal operations, while the integrated spring provides smooth, controlled return force that gently closes the door when released. The spring tension is calibrated to provide reliable closing without slamming, protecting both the door and cabinet frame from impact damage.

5 Six-Point Secure Mounting

The 6×Φ4.3 mounting holes (3 per leaf) with 20mm vertical and 13mm horizontal spacing allow M4 screws to securely fasten the hinge to both cabinet frame and door. The six-point fixation pattern ensures robust and stable installation that can withstand the repeated mechanical stress of the spring-loaded closing mechanism, resisting loosening from vibration and spring tension.

6 Compact 40×60mm Profile with Φ5 Pivot Pin

With a compact 40×60mm overall size, 1.5mm leaf thickness and Φ5 pivot pin, this hinge fits neatly within standard cabinet door-frame configurations while accommodating the integrated spring mechanism. The Φ5 pin provides sufficient load-bearing capacity for the spring-loaded operation, ensuring smooth and durable performance over tens of thousands of open-close cycles.

Application Fields

1. Electrical control cabinets, low-voltage distribution boxes, frequency converter enclosures and PLC equipment housings requiring automatic door closing
2. CNC machine tool safety guards, automation equipment protective doors and industrial machinery access panels where doors must remain closed
3. Medical equipment housings, laboratory analytical instruments and environmental monitoring control boxes (mirror finish for hygiene)
4. Food processing equipment, stainless steel sanitary cabinets and cleanroom facility enclosures requiring self-closing doors
5. Outdoor communication cabinets, energy storage battery boxes and waterproof monitoring equipment enclosures (SUS304 for corrosion resistance)
6. Sheet metal tool cabinets, industrial console doors and storage enclosures where accidental door opening must be prevented
7. Marine and boat equipment, RV accessories and outdoor fixtures requiring corrosion-resistant self-closing hardware
8. Safety equipment enclosures, protective guards and machinery covers where automatic door return is a safety requirement
9. Applications where space is limited and separate door closers cannot be installed

Installation & Maintenance Guidelines

Step-by-Step Installation Procedures

1. Determine the installation positions on both the cabinet frame and door panel according to the dimension drawing
2. Mark and drill 6×Φ4.3 through holes (3 per leaf) at 20mm vertical × 13mm horizontal spacing on both the frame and door panel
3. Align the hinge halves against the mounting surfaces and fasten with M4 screws through all six holes
4. Test the 180° opening movement and verify the spring-loaded self-closing function operates smoothly and consistently
5. Confirm that the door returns to the fully closed position automatically when released without slamming or binding
6. Adjust the hinge position slightly if needed to achieve proper door alignment and consistent closing force
7. For multiple hinges on one door, ensure all hinges are aligned to prevent binding and uneven spring force

Installation Quantity Recommendation

• Door height ≤500mm: Install 2 spring-loaded hinges symmetrically
• Door height 500mm to 900mm or medium-weight steel door: Install 3 hinges for balanced load and consistent closing force
• Note: For proper self-closing operation, all hinges on a door should be the same spring-loaded model to ensure balanced return force

Maintenance Instructions

1. Suitable for both indoor and outdoor environments, including damp, coastal and mildly corrosive conditions; for extreme salt spray or strong chemical environments, regular inspection is recommended
2. Wipe the mirror polished surface periodically with a soft dry or slightly damp microfiber cloth to remove dust, fingerprints and grease; avoid abrasive cleaners that may scratch the mirror finish
3. Apply a small amount of dry lubricant to the Φ5 pivot pin and spring mechanism every six months to maintain smooth rotation and consistent spring tension
4. Check all 6 mounting screw tightness quarterly, as spring tension may cause gradual loosening over time
5. Test the self-closing function quarterly to verify consistent closing force; if the spring weakens and the door no longer fully closes, replace the hinge
6. Inspect the spring mechanism annually for any signs of fatigue, deformation or corrosion; replace immediately if any damage is detected
7. Inspect the polished surface annually for scratches or corrosion; for coastal applications, rinse with fresh water periodically to remove salt deposits

Product Summary

CL253-6 is a 40×60mm spring-loaded butt hinge manufactured from premium SUS304 stainless steel with precision mirror polishing. Its integrated torsion spring self-closing mechanism, full stainless steel corrosion resistance, highly reflective polished finish, six-point M4 screw mounting, Φ5 pivot pin and 180° full opening angle make it an innovative and reliable hardware solution for electrical cabinets, machinery safety guards, medical equipment, food processing enclosures, outdoor installations and various industrial applications requiring automatic door return, corrosion resistance and a premium polished appearance.

CL253-6 SUS304 stainless steel mirror polished spring loaded butt hinge 180 degree 6-Φ4.3 mounting holes 40x60mm Φ5 pin self closing industrial cabinet equipment hinge