CL238-1 99×40mm SUS304 Stainless Steel 180° Oval Butt Hinge with Precision Grinding Finish

Full Technical Specifications

Model Number: CL238-1
Overall Dimensions: 99mm total length (40mm + 59mm 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, horizontal layout 9mm + 20mm + 20mm + 27mm
Design Feature: Oval rounded-end leaves, 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 Oval Rounded-End Design for Refined Aesthetic Appeal

The unique oval rounded-end leaf design eliminates sharp corners, providing a clean, furniture-grade appearance that is both visually appealing and safe to handle. This design makes the hinge suitable for visible exterior mounting on premium equipment, furniture doors and decorative enclosures where appearance matters.

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 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 six-point fixation pattern distributes load evenly 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

Electrical control cabinets, low-voltage distribution boxes, frequency converter enclosures and PLC equipment housings
Laboratory testing instruments, portable measuring devices and analytical equipment housings
Communication equipment cabinets, indoor server boxes and signal transfer enclosures
Outdoor monitoring equipment, weather-resistant instrument panels and coastal equipment enclosures
Furniture doors, cabinetry, woodworking projects and decorative equipment enclosures
Food processing equipment, stainless steel sanitary cabinets and cleanroom facility enclosures
Medical equipment casings, environmental monitoring devices and electronic instrument panels

Installation & Maintenance Guidelines

Step-by-Step Installation Procedures

Mark six drilling positions according to the technical drawing (20mm vertical spacing, horizontal layout 9+20+20+27mm), drill Φ5.6 through holes and machine 90° countersunk counterbores
Align the CL238-1 hinge flat against the cabinet mounting surface
Fasten with M5 flat head screws through all six countersunk holes for secure flush fixation
Test the 180° opening movement for smooth rotation and verify hinge stability under door load
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 door: Install 3 hinges for balanced stress distribution

Maintenance Instructions

Suitable for both indoor and outdoor environments, including damp, coastal and mildly corrosive conditions; for extreme chemical environments, regular inspection is recommended
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
Apply a small amount of stainless steel-compatible dry lubricant to the Φ5 pivot pin every six months to maintain smooth and quiet rotation
Inspect mounting screw tightness quarterly, especially on equipment subject to continuous vibration

Product Summary

CL238-1 is a 99×40mm 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 refined oval aesthetic, superior corrosion resistance, full 180° opening and reliable low-profile installation, it is a versatile and high-performance hardware solution for electrical cabinets, instrument enclosures, communication equipment, furniture doors and various applications requiring both visual appeal and durable functionality.

CL238-1 SUS304 stainless steel oval butt hinge 99x40mm grinding finish 180 degree 6 countersunk holes thin plate cabinet hinge