CL158-4 Wire Polished Stainless Steel Built-in Spring Automatic Reset 180° Butt Hinge

CL158-4 is a self-closing industrial butt hinge integrally constructed from solid stainless steel with wire drawing polishing finish. Its core feature is the built-in internal spring mechanism inside the hinge barrel, which automatically returns the door to the closed position after being opened, eliminating the need for additional door closers or latches. Equipped with 8 standard 90° countersunk mounting holes, 3mm thick reinforced leaf, and maximum 180° opening angle, it is widely used for electrical control boxes, instrument enclosures, equipment access panels, and all cabinets requiring automatic door closing function.

Core Technical Parameters

• Model Number: CL158-4
• Material: Stainless Steel
• Surface Treatment: Wire Polishing (Brushed matte finish)
• Core Function: Built-in spring automatic reset / self-closing
• Max Opening Angle: 180°
• Overall Length: 101.5mm
• Overall Height: 101mm
• Leaf Thickness: 3mm
• Mounting Holes: 8 pcs total Through hole: Φ7.2, countersunk sink: Φ10.5 × 90°
• Structure Type: Spring-loaded self-closing butt hinge

1. Material & Surface Advantages

Solid stainless steel substrate provides excellent rust, oxidation and weak corrosion resistance, suitable for damp workshops, semi-outdoor equipment and light salt spray environments. Wire drawing polished surface effectively resists fingerprints, minor scratches and daily abrasion, maintains clean metallic appearance under long-term frequent operation, more durable than mirror finish for industrial working conditions.

2. Built-in Spring Automatic Reset Mechanism

The biggest highlight of CL158-4 is the integrated spring inside the hinge barrel. Once the door is released from any opening angle, the spring torque automatically pulls it back to fully closed position. This self-closing function eliminates the risk of doors being left open accidentally, prevents dust, moisture and foreign objects from entering the cabinet, protects internal electrical components, and improves overall equipment safety and cleanliness. No additional door closer or magnetic catch needed, saving installation cost and cabinet space.

3. 3mm Thickened Reinforced Leaf

3mm solid thick plate greatly improves bending resistance and load-bearing capacity, avoids sagging and deformation under spring tension and door weight, ensures stable reset performance and smooth rotation after thousands of opening-closing cycles.

4. 8-Point Countersunk Flush Installation

8 evenly distributed 90° countersunk holes allow flat head screws to be fully embedded, keeping the equipment outer surface completely flat and scratch-free. Eight fixing points disperse spring tension and door weight uniformly, preventing hole deformation or pull-out on aluminum, steel and plastic panels, far more stable than 4-hole small hinges.

5. 180° Full Opening Range

Maximum 180° opening provides unobstructed access to cabinet interior for wiring, maintenance and component replacement. The spring reset force works smoothly throughout the full opening range, ensuring consistent closing speed and reliable self-return.

Core Selling Points

1. Built-in Spring Self-Closing Function Automatic door reset without extra accessories, prevents accidental open doors, protects internal equipment.
2. Corrosion-Resistant Stainless Steel Body Rustproof performance adapts to humid, workshop and semi-outdoor working environments.
3. Wire Brushed Anti-Fingerprint Surface Scratch-resistant, easy to clean, maintains industrial aesthetic for long-term use.
4. 3mm Thick Heavy-Duty Leaf Strong load capacity, anti-deformation, durable for thousands of spring cycles.
5. 8-Hole Flush Countersunk Mounting Even stress distribution, hidden screw installation, neat cabinet exterior.

Main Application Scenarios

1. Electrical distribution boxes, inverter control cabinets, PLC automation enclosures requiring automatic door closing
2. Outdoor waterproof equipment boxes, communication terminal cabinets, solar junction boxes
3. Laboratory test instrument housings, medical equipment protective covers, clean room cabinets
4. Industrial automation machine guards, CNC machine tool access panels, production line safety doors
5. Food processing equipment casings, pharmaceutical machinery doors, hygiene-grade self-closing cabinets

Installation & Selection Guidelines

1. Reset Force Confirmation: Spring tension is factory-calibrated, suitable for standard light-to-medium weight doors. For extra-heavy doors, install two CL158-4 hinges for balanced closing force.
2. Screw Matching: Must use 90° countersunk flat head screws matching Φ10.5 sink holes for fully flush installation.
3. Opening Range: Maximum 180° opening, verify side clearance before bulk order to avoid wall or frame collision.
4. Maintenance Tip: Periodically apply a small amount of lubricant to the hinge pin to keep spring action smooth and reduce friction noise.
5. Environment Note: Stainless steel version fits damp and mildly corrosive sites; avoid strong acid/alkali direct contact to protect spring mechanism.

Product Summary

CL158-4 is a functional upgrade model in the CL158 hinge series, adding built-in spring self-closing mechanism on the basis of stainless steel corrosion resistance and 8-point stable mounting. It solves the pain point of doors being left open accidentally in industrial scenarios, provides automatic reset, dust-proof and safety protection functions, and becomes an ideal hardware solution for electrical cabinets, instruments and equipment requiring reliable self-closing performance.

CL158-4 wire polished stainless steel spring auto reset butt hinge 180 degree opening cabinet hinge