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Zhengchen indexing plungers are purpose-built for fast, repeatable locking and accurate positioning in jigs, fixtures, automation lines, CNC machines, and production equipment. Pulling a knob, ring, or lever retracts the spring-loaded pin, allowing for easy repositioning and precise re-engagement.
Indexing plungers come in a variety of actuation methods, locking mechanisms, and mounting styles to suit different industrial applications. Below is a detailed breakdown of the most common types:
Description:
These plungers feature a spring-loaded pin that automatically returns to the locked position when released. They are ideal for applications requiring quick, repeatable indexing without the need for a separate lock-release action.
Features:
Spring-return mechanism.
Easy to operate by pulling the knob or ring.
Available in knob, pull-ring, or wire-loop handle styles.
Applications:
Assembly fixtures
Welding jigs
Adjustable machine elements
Description:
Lock-out plungers allow the pin to stay retracted until manually re-engaged. This is useful when the indexing function needs to be temporarily disabled during setup, maintenance, or repositioning.
Features:
Pin stays retracted when turned or pulled.
Prevents accidental engagement.
Suitable for safety-critical or high-vibration environments.
Applications:
Conveyor stops and guides
Safety locking in automation systems
Height-adjustable equipment
Description:
These variants use a ring or loop instead of a knob for actuation, allowing for low-profile or remote operation. Useful in confined spaces or where a tool or cable can assist in pulling.
Features:
Low-profile design
Optional tethering or remote actuation
Available with lock-out or non-lock-out function
Applications:
Enclosed fixtures
Panels or guards requiring remote release
Compact assemblies
Description:
Instead of pulling a knob or ring, these plungers are actuated by a lever or cam, providing faster or more forceful engagement/disengagement.
Features:
Quick, ergonomic actuation
High actuation force with minimal effort
Ideal for repetitive operations
Applications:
Tool-free changeovers
High-cycle equipment
Packaging and production lines
Description:
Compact plungers designed for press-fit mounting into bores or housings without threading. Often used where space is limited or aesthetics matter.
Features:
No external thread; press-fit installation
Compact, flush-mount design
Often used as indexing pins rather than full plungers
Applications:
Compact mechanical assemblies
Lightweight or portable devices
Electronic equipment fixtures
Select the right material and finish for your environment:
Stainless steel (AISI 303, 304): Excellent corrosion resistance; ideal for food, medical, and cleanroom applications.
Carbon steel with black oxide: Durable and economical for general industrial use.
Other protective finishes: Available for harsh or specialized environments.
GN/ISO-compatible designs for global standardization and seamless replacements.
Metric & inch threads to suit international and regional markets.
Selectable pin diameters (e.g. 4–16 mm) and stroke lengths to meet light-duty or heavy-duty requirements.
Zhengchen indexing plungers are not just off-the-shelf components—we offer configurable options to meet your exact mechanical, ergonomic, and environmental requirements. From tip geometry to thread type, stroke length to knob material, every detail can be tailored to your fixture or machinery needs.
Explore our advanced customization options below:
Long-Return vs Compact-Return
Fine-Thread vs Coarse-Thread
Specialty Indexing Plunger Options
Definition:
These options define how far the indexing pin retracts and the amount of spring force required to return it. The choice affects operating feel and physical space requirements.
| Style | Stroke Length | Spring Force | Best For |
|---|---|---|---|
| Long-Return | Extended | Moderate | Deeper engagement, adjustable stops |
| Compact-Return | Short | Higher | Space-restricted fixtures, quick indexing |
Benefits:
Improved component clearance and travel control
Custom stroke length available per request
Helps avoid over-travel or misalignment in sensitive setups
Definition:
Thread type impacts installation torque, vibration resistance, and adjustment precision.
| Thread Type | Pitch | Features | Applications |
|---|---|---|---|
| Fine Thread | Tight | Precise alignment, better vibration resistance | Precision machinery, optical devices |
| Coarse Thread | Broad | Faster installation, better grip in soft materials | General industrial use, aluminum fixtures |
Available in:
Metric (M6–M20) and inch sizes (1/4"–3/4")
Custom thread lengths upon request
Zhengchen offers a range of optional configurations to match your ergonomic and mechanical needs:
Choose from standard or custom pin nose shapes:
| Tip Type | Description | Use Case |
|---|---|---|
| Tapered | Easy alignment into hole | Quick positioning, angled entry |
| Cylindrical | Strong engagement | High-load locking |
| Spherical | Self-centering | Rotating parts, pivot locks |
Customize actuation based on your environment:
Standard round plastic knob (high-strength polymer)
Metal knurled knob for heat or chemical resistance
Pull-ring, wire-loop, or lever handle options for low-profile or remote actuation
Enable advanced functionality:
Lock pin in retracted position (for changeovers or safety)
Specify default rest position (pin extended or retracted)
Optional detent mechanism for tactile feedback
For visual identification (e.g., safety zones or function groups)
Custom labeling available on request
Our indexing plungers are trusted in a wide range of industries:
Workholding & fixture indexing on CNC machines, welding jigs, and assembly lines.
Height & angle adjustment on packaging lines, conveyor guides, and automation systems.
Rotation/swivel control in robotic arms and test benches.
Quick changeover in food processing, medical devices, electronics, and automotive fixtures.
✅ Smooth actuation and long service life with precision engineering.
✅ Wide in-stock selection reduces lead times.
✅ Customizable options for special applications.
✅ GN/ISO compatibility for standardization across your plant.
| Feature | Lock-Out Type | Non-Lock-Out Type |
|---|---|---|
| Retraction | Pin stays retracted until released | Spring returns pin automatically |
| Best for | Safety-critical applications | General indexing and positioning |
| Common uses | Load stops, position locks | Quick indexing, fixture pins |
Lock-out plungers allow the pin to remain in a retracted position until manually released. Non-lock-out plungers automatically return to the locking position when released.
Yes, plungers made from AISI 303 or 304 stainless steel are suitable for food processing and cleanroom environments.
Absolutely. We offer customization for thread sizes, pin tips, knob styles, and locking features.
Common industries include automotive, aerospace, medical, food processing, packaging, and electronics manufacturing.
Browse stainless steel or black-oxide carbon steel indexing plungers.
Select lock-out or non-lock-out types, with pull-ring or lever options.
Request CAD drawings, free samples, or a fast quote.
Talk to our engineers—we'll help you specify the right plunger for your fixture or assembly.
Zhengchen Hardware provides a wide selection of high-quality indexing plungers designed for mechanical locking and precise positioning in industrial systems. These components are commonly used in jigs, fixtures, automation lines, and production equipment where repeatable alignment or controlled rotation is required. Our indexing plungers include spring-loaded, self-locking, pull-ring, and lever-actuated types, with options for coarse or fine threads. Materials include stainless steel, carbon steel, and black oxide finishes for corrosion resistance. Many of our products follow GN and ISO standards, ensuring compatibility and reliable performance. Each plunger is engineered for smooth operation, long service life, and easy installation. We also support customized tip shapes, thread sizes, and knob designs to suit specific mounting or safety requirements.
