CL238-3 80×40mm SUS304 Stainless Steel 180° Compact Symmetrical Oval Butt Hinge with Precision Grinding Finish

Full Technical Specifications

• Model Number: CL238-3
• Overall Dimensions: 80mm total length (40mm + 40mm symmetrical leaves) × 40mm width × 2.5mm plate thickness
• Maximum Opening Angle: 180°
• Material: SUS304 Stainless Steel (entire hinge body and pivot pin)
• Surface Finish: Precision grinding (satin brushed metallic appearance, corrosion and rust resistant)
• Pivot Pin Diameter: Φ5mm solid steel pin
• Mounting Holes: 6 pieces of Φ5.6 holes with Φ10×90° countersunk counterbores
• Hole Center Distances: 20mm vertical spacing, symmetrical horizontal layout 9mm + 20mm + 20mm + 9mm
• Design Feature: Compact symmetrical oval rounded-end leaves (equal 40mm on both sides), thin 2.5mm plate profile

Core Product Features & Advantages

2.1 Full SUS304 Stainless Steel Construction for Superior Corrosion Resistance

The entire hinge, including both leaves and the pivot pin, is fabricated from premium SUS304 stainless steel, providing excellent resistance to rust, oxidation, moisture, salt spray and weak acid/alkali corrosion. The precision grinding surface further enhances the corrosion resistance while producing a consistent satin metallic finish that maintains its appearance over years of service in both indoor workshops and outdoor exposed environments.

2.2 Compact Symmetrical Oval Design for Space-Saving Balanced Aesthetics

The compact 80mm overall length with symmetrical equal 40mm leaves creates a perfectly balanced visual appearance while minimizing installation footprint, making it ideal for small and medium-sized equipment doors where space is limited. The oval rounded-end leaf design eliminates sharp corners, providing a clean, furniture-grade appearance that is both visually appealing and safe to handle, suitable for visible exterior mounting on premium equipment and furniture doors.

2.3 Thin 2.5mm Plate Profile for Flush Low-Profile Installation

The 2.5mm thin plate profile allows the hinge to mount flush with minimal protrusion, creating a sleek and unobtrusive installation. Despite its slim profile, the SUS304 stainless steel construction maintains sufficient structural rigidity and load-bearing capacity for light to medium-weight cabinet doors.

2.4 Six Countersunk Holes for Secure Flush Installation

Six standard 90° countersunk mounting holes (Φ5.6 through holes with Φ10 counterbores) allow M5 flat head screws to sink completely into the hinge plate, creating a clean flush surface with no protruding fasteners. The symmetrical six-point fixation pattern distributes load evenly across both leaves and prevents hinge loosening caused by vibration and mechanical impact.

2.5 Φ5 Solid Steel Pivot Pin for Stable Rotation

The Φ5 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.

2.6 180° 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.

Application Fields

1. Small electrical control boxes, compact PLC enclosures, terminal junction boxes and low-voltage distribution cabinets
2. Laboratory portable testing instruments, miniature medical diagnostic devices and analytical equipment housings
3. Communication equipment cabinets, indoor server boxes and compact signal transfer enclosures
4. Outdoor monitoring equipment, weather-resistant instrument panels and small coastal equipment enclosures
5. Furniture doors, cabinetry, woodworking projects and decorative equipment enclosures
6. Food processing equipment, stainless steel sanitary cabinets and cleanroom facility enclosures
7. Medical equipment casings, environmental monitoring devices and electronic instrument panels
8. Centered double-door installations and symmetrical equipment panels requiring balanced hinge appearance in limited space

Installation & Maintenance Guidelines

Step-by-Step Installation Procedures

1. Mark six drilling positions according to the technical drawing (20mm vertical spacing, symmetrical horizontal layout 9+20+20+9mm), drill Φ5.6 through holes and machine 90° countersunk counterbores
2. Align the CL238-3 hinge flat against the cabinet mounting surface, ensuring symmetrical placement on both door and frame
3. Fasten with M5 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 ≤500mm: Install 2 hinges in symmetrical arrangement
• Door height 500mm to 800mm or medium-weight door: Install 3 hinges for balanced stress distribution

Maintenance Instructions

1. Suitable for both indoor and outdoor environments, including damp, coastal and mildly corrosive conditions; for extreme chemical environments, regular inspection is recommended
2. Wipe the ground stainless steel surface periodically with a soft dry cloth to remove dust, grease and water stains; avoid abrasive cleaners that may scratch the satin finish
3. Apply a small amount of stainless steel-compatible dry lubricant to the Φ5 pivot pin every six months to maintain smooth and quiet rotation
4. Inspect mounting screw tightness quarterly, especially on equipment subject to continuous vibration

Product Summary

CL238-3 is a compact 80×40mm symmetrical SUS304 stainless steel oval butt hinge featuring precision grinding finish, a Φ5 pivot pin, six countersunk flush mounting holes and a slim 2.5mm thin plate profile. With its space-saving balanced symmetrical oval aesthetic, superior corrosion resistance, full 180° opening and reliable low-profile installation, it is a versatile and high-performance hardware solution for small electrical cabinets, instrument enclosures, communication equipment, furniture doors and various compact applications requiring both visual symmetry and durable functionality.