Spring Plungers & Indexing Plungers

Spring plungers and index plungers are mechanical components used in a wide range of machine and fixture applications. The plungers are typically used for locking, positioning, and locating pre-defined holes in projects. The plunger components come in a range of types, sizes and materials to suit your every requirement. There are two main types of plungers available, each suited to various different applications.

Index Plunger (With Button, Knob, or Pull Loop)

Index plungers are made up of a threaded body and a plunger and come with or without an actuating button or ring. The nose of the index plunger extends, which holds it in place, When the handle or lift ring is pulled back, the plunger is disengaged, and the plunger retracts back into the body. Some common variations of index plungers also include indexing plungers with pull knobs for easy operation and indexing pin versions for simpler applications.

Spring Plunger (With a Ball)

Spring plungers, also known as ball plungers, spring-loaded plungers, or spring plunger pins, are mechanical parts that are used to secure, position index, positively lock off, and apply pressure. The compact component is made up of a ball or pin and an internal spring, all contained in a housing that resembles a grub screw. The housings must be strong and are usually made from metals, including steel, stainless steel, or aluminium. Some spring plungers are also made of polyamide. Spring plungers are available in a range of thread sizes.

Key Differences between Spring Plunger & Indexing Plunger

The key difference between a spring plunger and an indexing plunger lies in their operation and application. Spring plungers provide a continuous spring force, making them suitable for applications requiring constant pressure or indexing. Indexing plungers, on the other hand, provide a locking action, holding the plunger in a specific position until manually released.

Spring & Indexing Plunger Types

There are various types of spring and indexing plungers, each designed for specific applications and functionalities. Here are the most common types used:

Cam-Action Indexing Plungers

Cam-action indexing plungers utilise a cam mechanism to provide a positive locking action. A cam mechanism is a rotating or sliding piece (the cam) that contacts a follower, converting rotary motion into linear motion or vice-versa. These indexing plungers are often used in applications where precise positioning and secure locking are required.

Non-Locking And Locking Index Plungers

Non-locking index plungers provide a spring-loaded indexing function without a locking mechanism. Locking index plungers, on the other hand, incorporate a locking mechanism to hold the plunger in a specific position. These plungers can be used to locate and secure components in jigs, fixtures, and machinery, ensuring precise alignment and preventing unwanted movement.

Flanged Indexing Plungers

Flanged indexing plungers have a flange on the body that provides a larger surface area for mounting and increased stability. They are often used in applications where the plunger needs to be securely fastened to a surface.

Press-Fit Plungers

Press-fit plungers are commonly used in applications where a threaded hole is not available or desired. This is because they are designed to be pressed into a hole. They also provide quick and easy installation.

Spring Plungers

Spring plungers, also known as ball plungers or spring-loaded pins, provide a continuous spring force for indexing, positioning, or applying pressure. They are available in various sizes, materials, and end configurations (e.g., ball, pin, or cone) to suit different applications.

Benefits of Using Spring & Index Plungers

Spring plungers and indexing plungers offer several benefits, making them versatile components in various applications:

• Secure Positioning and Locking: They provide reliable positioning and locking of components, ensuring stability and preventing unwanted movement.
• Indexing and Location: They are used for precise indexing and location of parts in jigs, fixtures, and machinery.
• Spring-Loaded Action: Spring plungers offer a continuous spring force for applications requiring constant pressure or indexing.
• Compact Design: Their compact size makes them suitable for space-constrained applications.
• Versatility: They are available in various types, sizes, and materials to suit diverse applications.

How to Install Spring & Index Plungers

Spring and indexing plungers feature a variety of installation methods, such as:

Internal

For internal installation of an index plunger or spring plunger, first, ensure the mounting hole is the correct size and properly cleaned. Then, insert the plunger into the hole and tighten the internal set screw or wrench flat to secure it in place. This method is often used when the plunger needs to be flush with the surface.

Hexagon

To install a hexagon index plunger, first, thread the plunger into the mounting hole until it is snug. Next, use a wrench or hex key to tighten the plunger to the desired torque.

Slot

For slot head spring plungers, first, insert the plunger into the mounting hole. Then, use a screwdriver to tighten the slot head screw to secure the plunger in place. This method is simple and convenient for many applications.

Top Slot

To install a top slot index plunger, first, thread the plunger into the mounting hole. Then, use a screwdriver to tighten the top slot screw to secure the plunger in place. This method is similar to the slot head installation but offers a different access point for tightening.

Spring & Indexing Plunger Threads

Spring plungers are available in a wide range of thread sizes to accommodate various applications. At RS, we offer indexing and spring plungers in a range of metric threads:

• M3: The smallest thread size often used in miniature or lightweight applications.
• M4: A common thread size for general-purpose applications.
• M5: A slightly larger thread size for applications requiring greater holding strength.
• M6: The most commonly used thread size for many industrial applications.
• M8: A larger thread size for heavier-duty applications.
• M10: A substantial thread size for applications with high load requirements.
• M12: A larger thread size suitable for heavy-duty applications with significant load requirements.
• M16: An even larger thread size for substantial industrial applications with high load capacities.
• M20: The largest thread size for heavy-duty applications with extreme load requirements.

Spring & Indexing Plunger Materials

Our range of indexing and spring plungers are available in a wide range of materials to suit every application. Manufactured from high-quality materials resistant to solvents, oils, and greases. They include:

• Aluminium: Lightweight and corrosion-resistant, suitable for applications where weight is a concern.
• Stainless steel, or stainless steel with nickel or zinc plating: Offers excellent corrosion resistance and durability, ideal for harsh environments.
• Steel: Provides high strength and durability for demanding applications.
• Polyamide: A lightweight and non-conductive option, suitable for applications where electrical insulation is required.

Industrial Applications of Spring & Index Plungers

Spring plungers and indexing plungers are versatile components used in various industries, such as:

Discrete Manufacturing

These plungers are used in assembly lines, jigs, and fixtures to ensure precise positioning and secure locking of components, contributing to workplace safety and efficient production processes.

Process Manufacturing

In process manufacturing, these plungers are used in equipment and machinery to provide accurate indexing and positioning, ensuring reliable operation and preventing misalignment.

Energy & Utilities

Spring plungers and indexing plungers are used in energy and utility applications to secure and locate components in electrical panels, switchgear, and other equipment.

Facilities & Intralogistics

These plungers are used in material handling equipment, such as conveyor systems and automated guided vehicles (AGVs), to provide indexing and positioning functionality.

How to Choose the Suitable Spring & Indexing v

Choosing the right spring plunger or indexing plunger depends on several factors:

• Application: Determine the specific application and required functionality (e.g., indexing, locking, or applying pressure).
• Size and Load: Consider the size and weight of the components being positioned or secured.
• Environment: Choose materials that can withstand environmental conditions, such as temperature, moisture, and chemicals.
• Mounting: Select the appropriate mounting style (e.g., threaded, press-fit) based on your application.
• Material: Choose a material that offers the required strength, durability, and corrosion resistance.

Trusted Ball Spring & Index Plunger Manufacturer, Supplier & Distributor in Australia

RS is your reliable source for high-quality spring and index plungers. We stock an extensive range from industry leaders like, Ganter, Elesa, and our own RS PRO line. Our selection spans various types and sizes at competitive prices, ensuring you find the perfect spring or index plunger for your application.

We also carry other essential engineering materials and industrial hardware, such as caster wheelsand levelling feet, providing comprehensive solutions for your design and manufacturing needs. Buy spring-loaded index plungers, ball spring plungers, and other accessories online today.

Buy Spring Loaded Pin & Indexing Pin Online from RS

We provide dependable delivery from as soon as the next working day. For approved business account customers, delivery is free on all orders over $40. We also welcome offline orders via telephone, email, or fax. For these orders, business account customers with a valid ABN enjoy free delivery on all orders over $80. Convenient self-collection from our Sydney branch is also available.

For more details, please refer to our Delivery Page.