CL233-3 65×55mm Zinc Alloy 180° Heavy-Duty Butt Hinge with Black Powder Coating

1. Full Technical Specifications

• Model Number: CL233-3
• Overall Dimensions: 65mm (L) × 55mm (H) × 6mm plate thickness
• Maximum Opening Angle: 180°
• Material: High-pressure die-cast zinc alloy body + solid steel pivot pin
• Surface Finish: Matte black powder coating (scratch-resistant, anti-corrosion, dust-proof, oil-resistant)
• Mounting Holes: 6 pieces of Φ7 holes with Φ13.5×90° countersunk counterbores
• Hole Center Distances: 40mm horizontal (20mm + 20mm spacing), 38mm vertical
• Pivot Pin: Solid steel pin for durable rotation

2. Core Product Features & Advantages

2.1 High-Strength Die-Cast Zinc Alloy Body

One-piece high-pressure zinc alloy die casting delivers excellent structural rigidity, impact resistance and reliable load-bearing capacity. The 65×55mm compact mounting plate and 6mm thickness provide robust support for medium and small industrial cabinet doors, resisting deformation under long-term frequent opening and closing.

2.2 Durable Black Powder Coating for Corrosion Protection

The uniform matte black powder coating forms a dense protective layer on the zinc alloy surface, effectively isolating moisture, workshop dust, oil mist and minor chemical splashes to prevent oxidation and rust. The coating is scratch-resistant, easy to wipe clean and maintains a professional industrial appearance over extended service life.

2.3 Solid Steel Pivot Pin for Stable Long-Term Rotation

The solid steel central pin ensures tight assembly clearance, low-friction rotation and high wear resistance. Precision machining maintains wobble-free operation over tens of thousands of open-close cycles, preventing hinge play, gap enlargement and door sagging common in lower-quality alternatives.

2.4 Six Countersunk Holes for Secure Flush Installation

Six standard 90° countersunk mounting holes (Φ7 through holes with Φ13.5 counterbores) allow M6 flat head screws to sink completely into the hinge plate, creating a clean flush surface with no protruding fasteners. The six-point fixation pattern distributes load evenly and prevents hinge loosening caused by vibration and mechanical impact.

2.5 180° Full Flat Opening Angle

The 180-degree maximum opening angle enables the cabinet door to lay completely flat against the cabinet side panel, eliminating operational blind zones and providing full unobstructed access for internal wiring, component replacement, equipment inspection and routine maintenance work.

3. Application Fields

1. Medium electrical control cabinets, low-voltage distribution boxes, frequency converter enclosures and PLC equipment housings
2. Automation equipment protective doors, industrial test bench casings and light machinery access panels
3. Indoor communication equipment cabinets, energy storage battery boxes and monitoring equipment 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
6. Aluminum profile industrial frames, mechanical equipment maintenance hatches and small electrical junction boxes

4. Installation & Maintenance Guidelines

Step-by-Step Installation Procedures

1. Mark six drilling positions according to the technical drawing (40mm horizontal × 38mm vertical spacing), drill Φ7 through holes and machine 90° countersunk counterbores
2. Align the CL233-3 hinge flat against the cabinet mounting surface
3. Fasten with M6 flat head screws through all six countersunk holes for secure flush fixation
4. Test the 180° opening movement for smooth rotation and verify hinge stability under door load
5. Retighten all screws periodically to prevent loosening from long-term mechanical vibration

Installation Quantity Recommendation

• Door height ≤600mm: Install 2 hinges in symmetrical arrangement
• Door height 600mm to 1000mm or medium-weight steel door: Install 3 hinges for balanced stress distribution and sag prevention

Maintenance Instructions

1. Suitable for indoor and mildly corrosive environments; not recommended for long-term deployment in strong acid/alkali workshops, coastal high salt fog or severe chemical vapor conditions
2. Wipe the black powder coated surface periodically with a soft dry cloth to remove metal dust, grease and water stains
3. Apply a small amount of dry lubricant to the steel pivot pin every six months to maintain smooth and quiet rotation
4. Inspect mounting screw tightness quarterly, especially on equipment subject to continuous vibration

5. Product Summary

CL233-3 is a compact 65×55mm die-cast zinc alloy butt hinge featuring matte black powder coating, a solid steel pivot pin and six countersunk flush mounting holes. With its reliable load-bearing capacity, corrosion protection and full 180° opening, it is a cost-effective and durable standard hardware solution for medium industrial electrical cabinets, automation equipment, instrument enclosures and various light-duty machinery access doors.

CL233-3 zinc alloy hinge 65x55mm black powder coated 180 degree heavy duty butt hinge 6 countersunk holes steel pin industrial cabinet equipment hinge