CL158-5 Wire Polished Stainless Steel Compact Built-in Spring Automatic Reset 180° Butt Hinge

CL158-5 is the compact size variant of CL158 series spring self-closing butt hinges, manufactured from solid stainless steel with wire drawing polishing finish. It features a built-in internal spring mechanism inside the hinge barrel that automatically returns the door to closed position after opening, eliminating the need for additional door closers. With 8 standard 90° countersunk mounting holes, 3mm thick reinforced leaf, and 76mm overall height, it is designed for smaller electrical boxes, instrument enclosures, equipment access panels and compact cabinets requiring automatic door closing function.

Core Technical Parameters

• Model Number: CL158-5
• 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: 76mm
• Leaf Thickness: 3mm
• Mounting Holes: 8 pcs total Through hole: Φ6.6, countersunk sink: Φ10 × 90°
• Structure Type: Compact spring-loaded self-closing butt hinge

1. Material & Surface Advantages

Solid stainless steel construction delivers 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 core feature of CL158-5 is the integrated spring inside the hinge barrel. Once the door is released from any opening angle, spring torque automatically pulls it back to fully closed position. This self-closing function prevents doors from being left open accidentally, stops dust, moisture and foreign objects from entering the cabinet, protects internal electrical components, and improves equipment safety and cleanliness. No additional door closer or magnetic catch needed, saving installation cost and cabinet space.

3. Compact Size for Small Cabinets

Compared with CL158-4 (101mm height), CL158-5 features a more compact 76mm height profile, specially designed for smaller door panels and limited installation space. It provides the same reliable spring self-closing function in a smaller footprint, perfect for instrument boxes, junction boxes, control panels and compact equipment enclosures.

4. 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.

5. 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.

Core Selling Points

1. Built-in Spring Self-Closing Function Automatic door reset without extra accessories, prevents accidental open doors, protects internal equipment.
2. Compact 76mm Height Profile Space-saving design, ideal for small cabinets, instrument boxes and compact equipment enclosures.
3. Corrosion-Resistant Stainless Steel Body Rustproof performance adapts to humid, workshop and semi-outdoor working environments.
4. Wire Brushed Anti-Fingerprint Surface Scratch-resistant, easy to clean, maintains industrial aesthetic for long-term use.
5. 8-Hole Flush Countersunk Mounting Even stress distribution, hidden screw installation, neat cabinet exterior.

Main Application Scenarios

1. Small electrical junction boxes, sensor enclosures, compact PLC control boxes
2. Instrument test housings, portable detection devices, desktop equipment panels
3. Outdoor small waterproof boxes, communication terminal cabinets, solar mini junction boxes
4. Laboratory small instrument covers, medical device access panels, clean room mini cabinets
5. Automation small module guards, CNC machine tool small access doors, production line mini safety panels

Installation & Selection Guidelines

1. Size Selection: Choose CL158-5 for small/medium doors with limited space; select CL158-4 (101mm height) for larger heavier doors requiring higher closing force.
2. Screw Matching: Must use 90° countersunk flat head screws matching Φ10 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. Load Suggestion: For wider or slightly heavier doors, install two CL158-5 hinges symmetrically for balanced closing force.

Product Summary

CL158-5 is the compact size variant in the CL158 spring hinge product line, delivering the same reliable built-in spring self-closing function as CL158-4 in a smaller 76mm height profile. It combines stainless steel corrosion resistance, wire brushed durable finish, 8-point stable mounting and automatic reset mechanism, providing a space-saving, cost-effective self-closing hinge solution for small electrical boxes, instrument enclosures and compact equipment cabinets.

CL158-5 wire polished stainless steel compact spring auto reset butt hinge 180 degree self-closing cabinet hinge