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CL275-1 steel white zinc plated CL275-1B SUS304 grinding polished 180 degree concealed hinge 2-Φ5.5 Φ9.5x90 countersunk holes Φ5 pin for electrical cabinets machinery enclosures communication equipment and industrial doors
CL275-1 technical dimension drawing steel SUS304 concealed hinge 180 degree opening countersunk mounting hole and U-channel size specification
CL275-1 steel white zinc plated CL275-1B SUS304 grinding polished 180 degree concealed hinge 2-Φ5.5 Φ9.5x90 countersunk holes Φ5 pin for electrical cabinets machinery enclosures communication equipment and industrial doors
CL275-1 technical dimension drawing steel SUS304 concealed hinge 180 degree opening countersunk mounting hole and U-channel size specification

CL275-1 Steel (White Zinc Plated) / CL275-1B SUS304 (Grinding Polished) 180° Concealed Hinge

CL275-1 steel/SUS304 180° concealed hinge, white zinc/polished, 2×Φ5.5 Φ9.5 ，Φ5 pin.

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CL275-1 Steel (White Zinc Plated) / CL275-1B SUS304 (Grinding Polished) 180° Concealed Hinge

Full Technical Specifications

  • Model Variants:
    • CL275-1: Steel material, white zinc plated finish (cost-effective indoor use)
    • CL275-1B: SUS304 stainless steel material, grinding polished finish (corrosion-resistant outdoor/hygienic use)
  • Maximum Opening Angle: 180°
  • Overall Dimensions: 70mm total length × 24mm side height
  • Main Body Length: 60mm
  • Pivot Pin Diameter: Φ5mm
  • Mounting Holes: 2 pieces Φ5.5 through holes with Φ9.5×90° countersunk counterbores, 53mm center spacing
  • Side Profile: 24mm total height, 10.6mm internal, 2mm wall thickness, 25mm bracket width, 19mm inner, t=3mm door panel
  • Bracket Bend Angle: 120°
  • Installation Type: Concealed U-channel design with countersunk flush mounting
  • Core Features: Dual material options (steel/SUS304), concealed hidden design, countersunk flush mounting, Φ5 pivot pin, 180° full opening, white zinc or polished finish

Core Product Features & Advantages

1 Dual Material Options for Flexible Application Matching

The hinge is available in two carefully engineered material variants to suit different environmental and budgetary requirements: CL275-1 manufactured from robust steel with white zinc plating, offering cost-effective corrosion protection for standard indoor industrial applications; and CL275-1B manufactured from premium SUS304 stainless steel with grinding polished finish, providing superior corrosion resistance, hygienic easy-to-clean surface and premium appearance for outdoor, coastal, medical and food processing applications.

2 Concealed U-Channel Design for Clean Exterior Appearance

The innovative U-channel concealed design ensures that minimal hinge hardware is visible on the exterior of the cabinet door when closed, creating a clean, seamless and professional appearance. The hinge body mounts within a recessed channel on the cabinet frame, while the extended Φ5 pivot pin engages with the door panel, providing a hidden hinge solution ideal for applications where aesthetic appearance is important.

3 Countersunk Flush Mounting for Snag-Free Exterior

The 2×Φ5.5 mounting holes are machined with Φ9.5×90° countersunk counterbores, allowing M5 flat head screws to sink completely flush with the mounting 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 concealed applications where a clean appearance is desired.

4 180° 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.

5 Φ5 Precision Pivot Pin for Smooth Durable Rotation

The Φ5 precision-machined pivot pin ensures tight clearance, low-friction rotation and minimal wobble, delivering smooth and quiet operation over tens of thousands of open-close cycles. The solid steel or SUS304 pin provides reliable load-bearing capacity for medium-weight cabinet doors.

6 Compact 70mm Footprint with Robust Construction

With a compact 70mm overall length and robust U-channel construction (2mm wall thickness, 3mm door panel compatibility), this hinge provides structural rigidity and reliable performance while fitting neatly within standard cabinet configurations. The 120° bracket bend ensures proper door-frame clearance and smooth operation.

Application Fields

  1. Electrical control cabinets, low-voltage distribution boxes, frequency converter enclosures and PLC equipment housings requiring concealed hinges
  2. CNC machine tool guards, automation equipment protective doors and industrial machinery access panels
  3. Communication equipment cabinets, server boxes and signal transfer enclosures
  4. Outdoor monitoring equipment, weather-resistant instrument panels and coastal equipment enclosures (SUS304 CL275-1B recommended)
  5. Medical equipment housings, laboratory analytical instruments and cleanroom facility enclosures (SUS304 CL275-1B recommended for hygiene)
  6. Food processing equipment, stainless steel sanitary cabinets and hygienic enclosures (SUS304 CL275-1B recommended)
  7. Sheet metal tool cabinets, industrial console doors and storage enclosures
  8. Marine and boat equipment, RV accessories and outdoor fixtures (SUS304 CL275-1B recommended for corrosion resistance)
  9. Aluminum profile industrial frames, mechanical equipment maintenance hatches and test fixtures
  10. Applications where concealed flush-mounted hardware with flexible material options is required

Installation & Maintenance Guidelines

Step-by-Step Installation Procedures

  1. Select the appropriate material variant: CL275-1 (steel, white zinc) for indoor cost-effective use, or CL275-1B (SUS304, polished) for outdoor/corrosive/hygienic use
  2. Determine the installation positions on both the cabinet frame and door panel according to the dimension drawing
  3. On the cabinet frame: prepare a U-channel recess matching the hinge body dimensions (24mm height, 2mm wall thickness)
  4. Mark and drill 2×Φ5.5 through holes at 53mm center spacing on the cabinet frame
  5. Machine 90° countersunk counterbores to Φ9.5 diameter on the mounting surface side to accommodate M5 flat head screws
  6. On the door panel (t=3mm): drill a Φ5 hole at the corresponding position to accommodate the pivot pin
  7. Insert the hinge body into the U-channel recess and fasten with M5 flat head screws through the 2 countersunk holes
  8. Confirm that all screw heads are completely flush with the mounting surface and do not protrude
  9. Align the door panel with the Φ5 pivot pin and ensure proper engagement
  10. Test the 180° opening movement for smooth rotation and verify hinge stability
  11. Adjust the mounting position slightly if needed to achieve proper door alignment and consistent gap spacing

Installation Quantity Recommendation

  • Door height ≤600mm: Install 2 concealed hinges symmetrically (top and bottom)
  • Door height 600mm to 1200mm or medium-weight steel door: Install 3 hinges (top, middle, bottom) for balanced load distribution

Maintenance Instructions

  1. CL275-1 (steel, white zinc): Suitable for indoor dry environments; not recommended for long-term outdoor exposure, high-humidity areas or coastal salt spray
  2. CL275-1B (SUS304, polished): Suitable for both indoor and outdoor environments, including damp, coastal and mildly corrosive conditions
  3. Wipe the surface periodically with a soft dry or slightly damp cloth to remove dust and grease; for SUS304 polished variant, use a microfiber cloth to maintain the polished finish and avoid abrasive cleaners
  4. Apply a small amount of dry lubricant to the Φ5 pivot pin every six months to maintain smooth and quiet rotation
  5. Check the 2 countersunk M5 mounting screw tightness quarterly to prevent loosening from vibration
  6. CL275-1: Inspect the white zinc plating annually for chips or scratches; touch up with zinc-rich paint if necessary to maintain rust protection
  7. CL275-1B: Inspect the polished surface annually for scratches or corrosion; for coastal applications, rinse with fresh water periodically to remove salt deposits
  8. Inspect the pivot pin and barrel assembly annually for any signs of wear, binding or excessive play
  9. Verify that the U-channel mounting remains secure and that the door opens and closes smoothly without binding

Product Summary

CL275-1 is a concealed U-channel hinge available in two material variants: CL275-1 manufactured from steel with white zinc plating for cost-effective indoor use, and CL275-1B manufactured from SUS304 stainless steel with grinding polished finish for corrosion-resistant outdoor and hygienic applications. Its innovative concealed design provides a clean seamless exterior appearance, the Φ9.5×90° countersunk flush mounting with M5 flat head screws creates a snag-free surface, the Φ5 precision pivot pin ensures smooth 180° full opening operation, and the compact 70mm robust U-channel construction provides reliable structural performance. With flexible material options and concealed flush-mounted design, it is an ideal hardware solution for electrical cabinets, machinery enclosures, communication equipment, medical devices, food processing enclosures, outdoor equipment and various industrial applications requiring hidden hardware with appropriate corrosion resistance.

CL275-1 steel SUS304 concealed hinge 180 degree white zinc plated grinding polished 2-Φ5.5 Φ9.5×90 countersunk holes Φ5 pin industrial cabinet equipment door hinge CL275-1B