Spring Plungers for Precision Indexing and Elastic Positioning

In mechanical assemblies where precise alignment, controlled force, or temporary locking is needed, Spring Plungers are often the perfect solution. These compact, cost-effective components provide repeatable pressure, secure indexing, and quick-release capability across a wide range of industrial applications.

At Dongguan Sango Hardware Fasteners Co., Ltd., we supply both standard and custom spring plungers to meet the demands of automation, electronics, jigs, and modular assemblies.

1. What Is a Spring Plunger?

A Spring Plunger is a compact mechanical device consisting of:

• A body (threaded or smooth)
• An internal spring
• A plunger tip (steel ball, cone, or pin)

The spring exerts force on the tip, allowing it to push against or into another component—holding it in place, indexing, or locating it.

🔧 Core Functions:

• Positioning in jigs and fixtures
• Temporary locking or indexing
• Preloading in mechanical structures
• Anti-loosening or anti-rattle element
• Damping or elastic guidance

2. Common Types of Spring Plungers

🔹 Ball Plunger (Spring-Loaded Ball)

• Most common type
• Ball-shaped tip, ideal for indexing holes or grooves

🔹 Pin Type Spring Plunger

• Cylindrical tip instead of a ball
• Used in sliding assemblies or tight linear guides

🔹 Threaded Spring Plunger

• External thread for adjustable depth
• Compatible with standard tapped holes

🔹 Press-Fit Spring Plunger

• Smooth body, press-in installation
• Compact and vibration-resistant

🔹 Hex Socket or Slotted Head Plungers

• For torque-adjustable installation
• Can be tightened/loosened with common tools

🔹 Stainless Steel or Plastic Body Plungers

• For corrosive environments or sensitive materials

3. Where Are Spring Plungers Used?

• 🛠 Tooling jigs and modular fixtures
• ⚙️ Adjustable guides and stops
• 📦 Packaging and sorting machines
• 🎮 Game controllers and mechanical keys
• 🚗 Automotive assemblies
• 🧪 Electronic component handling systems
• 🖥️ Panel locking and cover retention

They help ensure consistent force, repeatable positioning, and easy component replacement.

4. Selection Guide: How to Choose the Right Spring Plunger