CL253-4-F 35×50mm SUS304 Stainless Steel 180° Mirror Polished Flat Weld-on Butt Hinge (No Holes)

Full Technical Specifications

Model Number: CL253-4-F
Overall Dimensions: 35mm total width (17.5mm per leaf) × 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: None (flat hole-free plate, designed for weld-on or adhesive bonding installation)
Side Profile: 1.5mm leaf thickness
Core Features: Compact flat design, full SUS304 corrosion resistance, mirror polished aesthetic, hole-free seamless appearance, weld-on / adhesive installation, 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 Hole-Free Flat Design for Seamless Appearance and Flexible Installation

The clean hole-free flat plate design eliminates visible screw heads, creating a seamless and premium appearance on the equipment exterior. With no pre-drilled holes, installers have complete flexibility to choose welding or adhesive bonding for permanent fixation, or to drill custom holes at positions that best suit the specific application. This design is particularly suitable for visible exterior mounting where a clean, unbroken surface is desired.

4 Compact Mini Footprint for Space-Limited Applications

With a compact 35×50mm 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

Small electrical control boxes, compact PLC enclosures, terminal junction boxes and low-voltage distribution cabinets
Medical equipment housings, portable diagnostic devices, laboratory analytical instruments and environmental monitoring control boxes
Communication equipment cabinets, indoor/outdoor server boxes and compact signal transfer enclosures
Food processing equipment, stainless steel sanitary cabinets and cleanroom facility enclosures
Precision instrument panels, electronic test equipment casings and measurement device housings
Outdoor monitoring equipment, weather-resistant instrument panels and small coastal equipment enclosures
Premium compact furniture, electronic equipment casings and decorative enclosures where seamless hole-free appearance is preferred
Marine and boat equipment, RV accessories and outdoor fixtures requiring corrosion-resistant stainless steel hardware
Weld-on applications requiring permanent high-strength fixation with a clean seamless exterior appearance
Custom enclosures where non-standard mounting hole positions are required

Installation & Maintenance Guidelines

Step-by-Step Installation Procedures

Weld-on Installation:

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

Adhesive Bonding Installation:

Clean both the hinge mounting surfaces and the cabinet surfaces thoroughly with isopropyl alcohol to remove grease and contaminants
Apply a suitable industrial-grade metal adhesive (such as epoxy or structural acrylic) evenly to the hinge leaf surfaces
Press the hinge halves firmly against the cabinet frame and door panel at the determined positions
Use clamps or temporary fixtures to hold the hinges in place while the adhesive cures (follow adhesive manufacturer’s cure time)
After full cure, remove clamps and test the 180° opening movement for smooth rotation and secure bonding

Custom Drilling Installation:

Determine the desired mounting hole positions based on the specific application requirements
Mark and drill custom holes through the flat hinge plate at the chosen positions
Fasten the hinge halves to the cabinet frame and door panel with appropriate screws
Test the 180° opening movement for smooth rotation and verify hinge stability

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

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
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
Apply a small amount of dry lubricant to the Φ3 pivot pin every six months to maintain smooth and quiet rotation
For weld-on version: inspect weld joints annually for any signs of cracking, especially on equipment subject to continuous vibration
For adhesive version: inspect bond integrity annually; re-bond if any loosening is detected
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-F is a compact 35×50mm flat butt hinge with a clean hole-free design, manufactured from premium SUS304 stainless steel with precision mirror polishing. Its full stainless steel corrosion resistance, highly reflective polished finish, seamless hole-free appearance, flexible weld-on / adhesive / custom drilling installation options, compact space-saving design and 180° full opening angle make 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 a clean seamless exterior.

CL253-4-F SUS304 stainless steel mirror polished flat weld on butt hinge 180 degree no holes 35x50mm Φ3 pin small industrial cabinet equipment hinge