CL225-8 33.2mm Ultra Compact Zinc Plated Steel Spring Loaded Drop Pin Detachable Barrel Hinge, Left & Right Hand Available

Full Technical Parameter Specification

• Model Number: CL225-8
• Material: Cold rolled carbon steel stamped integrated structure
• Surface Finish: Electroplated zinc coating (anti-rust, anti-oxidation, wear-resistant)
• Overall Outer Size: Total length 33.2mm, width 11mm
• Mounting Holes: 2 pcs Φ3.2 through holes, center distance 14.2mm
• Tapered Locating Pin Diameter: Φ3mm
• Spring Front Guide Diameter: Φ1mm
• Model Classification Table

• H2 2. Core Product Advantages & Features

  2.1 Ultra-Miniature All-Steel Compact Structure

  Super small overall dimension only 33.2mm in total length, occupies minimal installation space, perfectly fits narrow, miniature equipment shells. Integrated stamped steel body has good rigidity and anti-torsion performance, stable load for lightweight small cabinet doors, no easy bending or deformation.

  2.2 Zinc Plating Effective Anti-Corrosion Protection

  Uniform zinc electroplated surface forms a dense protective film, isolates air, moisture and dust to prevent metal rusting and oxidation. Works reliably in indoor office, laboratory and dry workshop environments, greatly extend the service life of precision small hardware.

  2.3 Built-in Spring Automatic Self-Locking Safety Mechanism

  Internal miniature compression spring provides continuous elastic tension, automatically locks the tapered drop pin after assembly. Effectively avoid pin accidental pop-out during repeated opening and closing, prevent tiny enclosure doors from falling off and improve equipment operation safety.

  2.4 Pre-Drilled Φ3.2 Holes for Easy Screw Mounting

  Fixed base plate comes with two standard Φ3.2 mounting holes, directly fixed with tiny machine screws without welding process. Simplify mass production assembly procedures, convenient for later disassembly, inspection and component replacement.

  2.5 Independent Left & Right Hand Symmetrical Matching

  Two directional models for flexible selection: Left hinge CL225-8-Z and Right hinge CL225-8-Y. Choose according to the opening direction of the small door, perfectly match single-sided flip covers, double tiny doors and side-opening miniature equipment panels.

  2.6 Tool-Free One-Step Quick Detachment

  Press the spring end backward to retract the Φ3 tapered pin, then lift the small door upward to fully separate it without screwdrivers or other tools, highly efficient for internal circuit checking, device debugging and product packaging transportation.

  Main Application Scenarios

  1. Tiny precision instrument housings, sensor protection casings, miniature electronic control modules
  2. Laboratory testing small boxes, portable measuring equipment shells, handheld device protective covers
  3. Low-power terminal junction boxes, miniature signal distribution boxes, small PCB shielding enclosures
  4. Automation micro actuator protective shells, small medical testing accessories housings
  5. All small-sized sheet metal boxes and equipment panels with extremely limited installation space

  Installation & Daily Maintenance Guide

  4.1 Step-by-Step Installation Process

  1. Select CL225-8-Z (Left) or CL225-8-Y (Right) hinge based on door swing direction
  2. Mark 14.2mm hole center distance on the equipment frame, drill Φ3.2 holes
  3. Fasten the fixed plate tightly with small screws, compress the spring and insert the Φ3 locating pin into the sleeve
  4. Test door rotation flexibility, check spring locking tightness and smooth lift-off effect

  4.2 Installation Quantity Recommendation

  • Door height ≤ 200mm: Install 2 hinges symmetrically
  • Door height 200–350mm: Add 1 middle hinge to avoid door sagging and unbalanced stress

  4.3 Maintenance Attention Points

  ❌ Not applicable for long-term use in strong acid/alkali corrosive environment, heavy dust and coastal salt fog atmosphere.

  1. Wipe zinc-plated surface with dry soft cloth regularly to keep away from dust and water vapor
  2. Drop a tiny amount of anti-rust lubricating oil on spring and pin sliding position every 3–6 months to ensure smooth rebound

  Product Closing Summary

  CL225-8 is an ultra-miniature spring loaded drop pin detachable barrel hinge made of full carbon steel with durable zinc anti-corrosion plating. It supports left and right hand options, screw-on hole installation and spring self-locking design to realize tool-free fast door removal. Its ultra-small footprint and stable mechanical performance make it a premium miniature hardware solution for precision instruments, tiny electronic enclosures and compact light-duty equipment cabinets.

• CL225-8 tiny spring loaded lift off hinge zinc plated steel left right detachable mini cabinet barrel hinge 2-Φ3.2 mounting holes