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 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 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.
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.
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 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 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 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 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, 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.
Spring plungers and indexing plungers offer several benefits, making them versatile components in various applications:
Spring and indexing plungers feature a variety of installation methods, such as:
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.
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.
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.
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 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:
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:
Spring plungers and indexing plungers are versatile components used in various industries, such as:
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.
In process manufacturing, these plungers are used in equipment and machinery to provide accurate indexing and positioning, ensuring reliable operation and preventing misalignment.
Spring plungers and indexing plungers are used in energy and utility applications to secure and locate components in electrical panels, switchgear, and other equipment.
These plungers are used in material handling equipment, such as conveyor systems and automated guided vehicles (AGVs), to provide indexing and positioning functionality.
Choosing the right spring plunger or indexing plunger depends on several factors:
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.
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.
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