CL257-1 Steel White Zinc Plated 110° Concealed Hinge with PA (Nylon) Spacer Sleeve

Full Technical Specifications

Model Number: CL257-1
Hinge Body and Pin Material: Solid steel
Spacer Sleeve Material: PA (polyamide / nylon)
Surface Finish: White zinc plating (rust-proof, wear-resistant, clean industrial appearance)
Maximum Opening Angle: 110°
Overall Dimensions: 35.2mm body length + 11mm extended pivot pin = 46.2mm total length
Body Length: 32mm (main body section)
Pivot Pin Diameter: Φ4mm
Mounting Hole: Φ5.1mm (single mounting hole)
Side Profile: 15.5mm width × 18.5mm height, 2mm leaf thickness, >5mm clearance gap, 7.4mm internal depth, 12mm height
Top Dimension: 10mm
Core Features: PA nylon spacer sleeve for smooth low-friction rotation, steel construction, white zinc corrosion resistance, compact concealed design, 110° opening, extended pivot pin

Core Product Features & Advantages

1 PA (Nylon) Spacer Sleeve for Smooth Low-Friction Rotation

The integrated PA (polyamide/nylon) spacer sleeve between the steel pivot pin and hinge barrel provides a self-lubricating bearing surface that significantly reduces friction, eliminates metal-to-metal contact and ensures exceptionally smooth, quiet rotation. This nylon sleeve also minimizes wear on both the pin and barrel, extending the service life of the hinge and maintaining consistent smooth operation over tens of thousands of open-close cycles without the need for frequent lubrication.

2 Solid Steel Construction with White Zinc Plating

The entire hinge, including both the body and pivot pin, is fabricated from robust solid steel for excellent structural rigidity and load-bearing capacity. The uniform white zinc plating forms a protective layer that effectively resists oxidation, rust and surface abrasion, providing reliable performance in standard indoor industrial environments while maintaining a clean and professional appearance.

3 Compact Concealed Design for Space-Saving Installation

With a compact 35.2mm body and concealed mounting configuration, this hinge is designed for applications where space is limited and a clean exterior appearance is desired. The extended 11mm pivot pin inserts into a pre-drilled hole in the door panel, while the Φ5.1 mounting hole secures the hinge body to the cabinet frame, creating a hidden hinge solution with minimal visible hardware.

4 110° Maximum Opening Angle

The 110-degree maximum opening angle provides adequate access for internal wiring, component replacement, equipment inspection and routine maintenance work on most standard cabinet configurations. The angle is calibrated to prevent the door from striking adjacent equipment or walls while still providing sufficient operational access.

5 Extended Pivot Pin for Secure Door Engagement

The 11mm extended steel pivot pin provides deep, secure engagement with the door panel, ensuring stable and reliable door attachment that resists dislodging under vibration or mechanical impact. The Φ4 pin diameter provides sufficient load-bearing capacity for medium-weight cabinet doors.

6 Cost-Effective Reliable Industrial Hardware

Combining solid steel construction, white zinc corrosion protection, PA nylon smooth-rotation technology and compact concealed design, this hinge offers excellent value for high-volume industrial cabinet manufacturing. It provides reliable performance at a cost-effective price point, making it suitable for large-scale production runs and OEM equipment applications.

Application Fields

Electrical control cabinets, low-voltage distribution boxes, frequency converter enclosures and PLC equipment housings
CNC machine tool guards, automation equipment protective doors and industrial machinery access panels
Communication equipment cabinets, server boxes and signal transfer enclosures
Sheet metal tool cabinets, industrial console doors, workbench cabinets and storage enclosures
Test bench cabinets, laboratory equipment enclosures and environmental monitoring control boxes
Aluminum profile industrial frames, mechanical equipment maintenance hatches and test fixtures
High-volume electrical cabinet manufacturing and OEM equipment production requiring cost-effective reliable hinges
Indoor industrial applications where smooth low-friction rotation and corrosion resistance are required
Applications where compact concealed hinge design with minimal visible hardware is preferred

Installation & Maintenance Guidelines

Step-by-Step Installation Procedures

Determine the installation positions on both the cabinet frame and door panel according to the dimension drawing
On the cabinet frame: mark and drill a Φ5.1 through hole for the hinge body mounting
On the door panel: drill a Φ4 hole at the corresponding position to accommodate the extended pivot pin
Insert the 11mm extended pivot pin into the pre-drilled Φ4 hole in the door panel
Align the hinge body against the cabinet frame and fasten with an M5 screw through the Φ5.1 mounting hole
Test the 110° opening movement for smooth rotation and verify hinge stability
Confirm that the PA spacer sleeve provides smooth, friction-free operation without binding
Adjust the mounting position slightly if needed to achieve proper door alignment and consistent gap spacing

Installation Quantity Recommendation

Door height ≤500mm: Install 2 hinges symmetrically (top and bottom)
Door height 500mm to 900mm or medium-weight steel door: Install 3 hinges (top, middle, bottom) for balanced load distribution

Maintenance Instructions

Suitable for indoor dry environments; not recommended for long-term outdoor exposure, high-humidity areas, coastal salt spray or severe chemical vapor conditions
Wipe the white zinc plated surface periodically with a soft dry cloth to remove dust, grease and moisture
The PA nylon spacer sleeve is self-lubricating and generally does not require additional lubrication; if rotation becomes noisy, apply a small amount of dry lubricant to the pivot pin
Check the Φ5.1 mounting screw tightness quarterly to prevent loosening from vibration
Inspect the white zinc plating annually for chips or scratches; touch up with zinc-rich paint if necessary to maintain rust protection
Inspect the PA spacer sleeve annually for any signs of wear, cracking or deformation; replace the hinge if the sleeve is damaged
Verify that the extended pivot pin remains properly seated in the door panel hole; re-seat if loosening occurs

Product Summary

CL257-1 is a compact concealed hinge manufactured from solid steel with white zinc plating, featuring an integrated PA (nylon) spacer sleeve for exceptionally smooth low-friction rotation. Its steel construction provides reliable structural rigidity, the white zinc plating offers corrosion protection for standard indoor environments, the extended Φ4 pivot pin ensures secure door engagement, and the single Φ5.1 mounting hole enables straightforward installation. With a 110° maximum opening angle and compact concealed design, it is a cost-effective and reliable hardware solution for electrical cabinets, machinery enclosures, communication equipment, industrial consoles and various high-volume OEM applications requiring smooth operation, corrosion resistance and space-saving concealed hardware.

CL257-1 steel white zinc plated concealed hinge 110 degree PA spacer sleeve Φ4 pin Φ5.1 mounting hole industrial cabinet equipment door hinge