CL253-7A 38×75mm SUS304 Stainless Steel 180° Mirror Polished Countersunk Mini Butt Hinge

Full Technical Specifications

• Model Number: CL253-7A
• Overall Dimensions: 38mm total width (12mm + 12mm leaves + barrel) × 75mm height × 2mm 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: Φ4mm
• Mounting Holes: 6 pieces Φ3.2 through holes with Φ6.2×90° countersunk counterbores (3 per leaf), 30mm vertical spacing, 12mm horizontal spacing
• Side Profile: 2mm leaf thickness
• Core Features: Compact mini size, 2mm heavy-duty thickness, full SUS304 corrosion resistance, mirror polished aesthetic, countersunk flush mounting, 180° full opening

Core Product Features & Advantages

1 Premium SUS304 Stainless Steel with 2mm Heavy-Duty Thickness

The entire hinge is fabricated from SUS304 stainless steel with a substantial 2mm leaf thickness, providing excellent corrosion resistance, structural rigidity and reliable load-bearing capacity. Suitable for both indoor and outdoor environments, including damp, coastal and mildly corrosive conditions, it maintains reliable performance over years of service without rusting, bending or deforming.

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 Countersunk Flush Mounting for Clean Snag-Free Exterior

The 6×Φ3.2 mounting holes are machined with Φ6.2×90° countersunk counterbores, allowing M3 flat head screws to sink completely flush with the hinge surface. This creates a smooth, snag-free exterior that eliminates protruding screw heads, improving safety, aesthetics and ease of cleaning. The flush mounting is particularly suitable for visible exterior applications and environments where snagging or catching must be avoided.

4 Compact Mini Footprint for Space-Limited Applications

With a compact 38×75mm overall size and 2mm leaf thickness, this hinge is designed for small to medium-sized equipment enclosures where installation space is limited but structural strength is still required. The mini footprint allows it to fit neatly on instrument panels, control boxes and precision device housings while providing more load-bearing capacity than thinner 1.5mm alternatives.

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 Six-Point Countersunk Mounting with Φ4 Pivot Pin

The 6×Φ3.2 countersunk holes (3 per leaf) with 30mm vertical and 12mm horizontal spacing ensure secure and stable installation with M3 flat head screws. The Φ4 precision-machined pivot pin provides tight clearance, low-friction rotation and minimal wobble, delivering smooth and quiet operation over tens of thousands of open-close cycles.

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 (flush mounting for hygiene)
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 and flush mounting are preferred
8. Marine and boat equipment, RV accessories and outdoor fixtures requiring corrosion-resistant stainless steel hardware
9. Applications where snag-free flush screw mounting and a clean exterior appearance are required

Installation & Maintenance Guidelines

Step-by-Step Installation Procedures

1. Determine the installation positions on both the cabinet frame and door panel according to the dimension drawing
2. Mark and drill 6×Φ3.2 through holes (3 per leaf) at 30mm vertical × 12mm horizontal spacing on both the frame and door panel
3. Machine 90° countersunk counterbores to Φ6.2 diameter on the mounting surface side to accommodate M3 flat head screws
4. Align the hinge halves against the mounting surfaces and fasten with M3 flat head screws through all six countersunk holes
5. Confirm that all screw heads are completely flush with the hinge surface and do not protrude
6. Test the 180° opening movement for smooth rotation and verify hinge stability
7. Adjust the hinge position slightly if needed to achieve proper door alignment and consistent gap spacing

Installation Quantity Recommendation

• Door height ≤500mm: Install 2 hinges symmetrically
• Door height 500mm to 800mm 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 Φ4 pivot pin every six months to maintain smooth and quiet rotation
4. Check M3 countersunk mounting screw tightness quarterly to prevent loosening from vibration
5. Inspect the polished surface annually for scratches or corrosion; for coastal applications, rinse with fresh water periodically to remove salt deposits
6. Inspect the countersunk holes periodically to ensure screw heads remain flush and have not backed out

Product Summary

CL253-7A is a compact 38×75mm mini butt hinge with 2mm heavy-duty leaf thickness and countersunk flush mounting, manufactured from premium SUS304 stainless steel with precision mirror polishing. Its full stainless steel corrosion resistance, highly reflective polished finish, robust 2mm construction, snag-free countersunk M3 flush mounting, Φ4 precision pivot pin and 180° full opening angle make it an ideal hardware solution for small electrical cabinets, medical equipment, laboratory instruments, food processing enclosures, communication devices, outdoor equipment and various precision applications requiring durable performance, a premium polished appearance and a clean flush exterior.