CL253-4 32×50mm SUS304 Stainless Steel 180° Mirror Polished Mini Butt Hinge (Weld-on / Screw-on)

Full Technical Specifications

• Model Variants:
  • CL253-4: Weld-on version (no mounting holes, for permanent welding installation)
  • CL253-4-2: Screw-on version (with 4×Φ5 mounting holes)
• Overall Dimensions: 32mm total width × 50mm 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: Φ3mm
• Mounting Holes (CL253-4-2 only): 4 pieces Φ5 through holes, center distances 23mm horizontal × 35mm vertical
• Side Profile: 1.5mm leaf thickness
• Core Features: Compact mini size, full SUS304 corrosion resistance, mirror polished aesthetic, dual installation options (weld-on / screw-on), 180° full opening

Core Product Features & Advantages

1 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.

2 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 and cleanroom applications where hygiene and appearance are critical.

3 Dual Installation Options: Weld-on or Screw-on

Two variants are available to match different installation requirements: the CL253-4 weld-on version provides permanent, high-strength fixation suitable for heavy-duty or vibration-prone applications where screws may loosen, while the CL253-4-2 screw-on version with 4×Φ5 holes offers easy installation, removal and replacement for standard cabinet applications. This flexibility allows designers to select the optimal mounting method for each specific project.

4 Compact Mini Footprint for Space-Limited Applications

With a compact 32×50mm overall size and 1.5mm leaf thickness, this hinge is specifically designed for small and medium-sized equipment enclosures where installation space is limited. The mini footprint allows it to fit neatly on compact instrument panels, small control boxes and precision device housings without occupying excessive surface area.

5 180° Full Flat Opening Angle

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

6 Smooth Precision Rotation with Φ3 Pivot Pin

The precision-machined barrel and Φ3 pin assembly ensures tight clearance, low-friction rotation and minimal wobble, delivering smooth and quiet operation over tens of thousands of open-close cycles. The compact construction is optimized for lightweight to medium-weight small cabinet doors.

Application Fields

1. Small electrical control boxes, compact PLC enclosures, terminal junction boxes and low-voltage distribution cabinets
2. Medical equipment housings, portable diagnostic devices, laboratory analytical instruments and environmental monitoring control boxes
3. Communication equipment cabinets, indoor/outdoor server boxes and compact signal transfer enclosures
4. Food processing equipment, stainless steel sanitary cabinets and cleanroom facility enclosures
5. Precision instrument panels, electronic test equipment casings and measurement device housings
6. Outdoor monitoring equipment, weather-resistant instrument panels and small coastal equipment enclosures
7. Premium compact furniture, electronic equipment casings and decorative enclosures where polished appearance is preferred
8. Marine and boat equipment, RV accessories and outdoor fixtures requiring corrosion-resistant stainless steel hardware
9. Weld-on applications requiring permanent high-strength fixation on heavy-duty or vibration-prone equipment

Installation & Maintenance Guidelines

Step-by-Step Installation Procedures

For CL253-4-2 Screw-on Version:

1. Determine the installation positions on both the cabinet frame and door panel according to the dimension drawing
2. Mark and drill 4×Φ5 through holes at 23mm horizontal × 35mm vertical spacing on both the frame and door panel
3. Align the hinge halves against the mounting surfaces and fasten with M5 screws through all four holes
4. Test the 180° opening movement for smooth rotation and verify hinge stability
5. Adjust the hinge position slightly if needed to achieve proper door alignment and consistent gap spacing

For CL253-4 Weld-on Version:

1. Determine the installation positions on both the cabinet frame and door panel
2. Position the hinge halves against the mounting surfaces and tack weld in place
3. Verify door alignment and 180° opening movement before completing full welds
4. Complete the full welding around the hinge base for permanent fixation
5. Clean and polish the weld area if necessary to maintain the mirror finish appearance
6. Test the 180° opening movement for smooth rotation after welding is complete

Installation Quantity Recommendation

• Door height ≤400mm: Install 2 hinges symmetrically
• Door height 400mm to 700mm or medium-weight door: Install 3 hinges for balanced load distribution

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 rinsing with fresh water 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 or scouring pads that may scratch the mirror finish
3. Apply a small amount of dry lubricant to the Φ3 pivot pin every six months to maintain smooth and quiet rotation
4. For screw-on version: check mounting screw tightness quarterly to prevent loosening from vibration
5. For weld-on version: inspect weld joints annually for any signs of cracking, especially on equipment subject to continuous vibration
6. Inspect the polished surface annually for scratches or corrosion; for coastal applications, rinse with fresh water periodically to remove salt deposits

Product Summary

CL253-4 is a compact 32×50mm mini butt hinge manufactured from premium SUS304 stainless steel with precision mirror polishing. Available in both weld-on (CL253-4) and screw-on with 4×Φ5 holes (CL253-4-2) variants, it offers full stainless steel corrosion resistance, a highly reflective polished finish, dual installation flexibility, compact space-saving design and 180° full opening angle. This makes it an ideal hardware solution for small electrical cabinets, medical equipment, laboratory instruments, communication devices, outdoor enclosures and various precision applications requiring durable performance, a premium polished appearance and flexible mounting options.

CL253-4 SUS304 stainless steel mirror polished mini butt hinge 180 degree weld on screw on 4-Φ5 holes 32x50mm Φ3 pin small industrial cabinet equipment hinge