Plummer Blocks & Pillow Blocks

A pillow block is a robust, pedestal-style mounting assembly that provides critical support for a rotating shaft. Also known as a plummer block or plummer block housing, the unit consists of a robust casing that safely encloses an internal bearing, allowing the shaft's inner part to rotate freely.

These units are indispensable in industrial applications due to their exceptional load-bearing capabilities and durability. Available in materials such as cast iron, stainless steel and various alloys, and compatible with both ball bearings and roller bearings, they are built to support a wide range of needs, from lightweight to heavy industrial loads.

Key Uses of Pillow Block Bearings

A pillow block ball bearing unit is designed to securely mount a bearing, enabling the rotating shaft to be both supported and operational. It functions by safely housing the bearing such that the outer ring remains stationary while the inner ring rotates freely with the shaft, ensuring smooth and reliable operation.

Some of the key uses of a pillow block bearing include:

• Supporting Rotating Shafts in Machinery and Equipment: The plummer block provides robust support for shafts, effectively managing both radial and minor thrust loads in heavy machinery.
• Enabling Smooth Rotation in Motors and Drive Systems: These bearings are vital in conveyors and power transmission systems, reducing friction for efficient and continuous rotation.
• Providing Reliable Shaft Alignment in HVAC Systems and Fans: The self-aligning feature of the pillow block housing accommodates minor shaft misalignment, ensuring the longevity of industrial fans and air handling units.
• Protecting Bearings from Dust, Dirt and Contaminants: Integral seals within the plummer block housing keep lubrication in and contaminants out, extending the bearing’s lifespan.

Types of Pillow Block Bearings and Housing Units

While all pillow block assemblies serve the fundamental purpose of supporting a rotating shaft, their precise design, internal bearing type and split configuration define their suitability for specific industrial environments.

Plummer Blocks

A plummer block is a robust, heavy-duty housing unit specifically designed to safely mount large-diameter bearings. These assemblies are built with maximum durability to transfer high power and reliably support the heaviest industrial loads.

Due to their exceptional strength and load-bearing capabilities, they are the ideal choice for demanding environments. Typical applications include mining, heavy manufacturing (such as steel mills), material processing plants, and other high-load industrial operations.

Pillow Blocks / Pillow Block Bearing Units

A pillow block — or pillow block bearing unit — is a versatile assembly primarily designed for lightweight to moderate applications. These housing units allow for separate bearing installations and often use a single, solid-piece structure for simpler mounting.

While their primary use is for lighter loads, pillow blocks are highly adaptable, making them ideal for systems requiring custom bearing setups or quick replacements. They can accommodate various internal bearing types, including ball bearings, roller bearings and tapered bearings.

Their use also extends to light-to-moderate applications on heavy-duty industrial equipment, where the unit’s easy maintenance and adaptability are prioritised over high-capacity load support.

How to Choose the Right Pillow Block Bearings

Selecting the correct pillow block bearing is essential for ensuring machine safety, efficiency and longevity. When sourcing your plummer blocks and units, consider the following critical factors:

• Load and Speed Requirements: You must check the specific radial and axial loads your shaft will handle, along with the maximum rotational speed. This dictates whether you need a lighter pillow block ball bearing unit or a heavy-duty plummer block housing.
• Material and Environment: Consider the operational environment; for wash-down areas or applications exposed to moisture and chemicals, choosing stainless steel or specific alloys is vital for corrosion resistance and durability.
• Mounting Type: Determine the required housing style, such as base mounting (pedestal style) or flange mounting. Ensure the selected unit’s geometry is fully compatible with your existing machinery frame.
• Bearing Type: Decide between a ball bearing (ideal for high-speed, lighter loads) or a roller bearing (better for slow-speed, extremely heavy loads). The internal bearing chosen dictates the final performance of the unit.
• Maintenance and Lifespan: Choose sealed pillow blocks for a low-maintenance, lubricated-for-life solution, or opt for unsealed units that allow for easier inspection and re-lubrication in demanding applications.

Industry Applications of Pillow Block Bearings

Plummer blocks and pillow blocks are widely used across a variety of industries and applications, including:

• Manufacturing Lines, Conveyor Belts and Motors: These units are crucial for supporting drive shafts in continuous operational environments, ensuring smooth product flow on conveyor systems and maintaining reliable motor performance.
• Mining, Material Handling and Industrial Machinery: Heavy-duty plummer block housing units are essential for withstanding the high radial and thrust loads found in excavation equipment, crushers and bulk material processing plants.
• Fans, Pumps and HVAC Systems: Pillow block ball bearing units ensure reliable shaft alignment and quiet operation in large industrial fans, water pumps and air handling units, which are vital for temperature regulation and fluid transfer.
• OEM Machinery Requiring Reliable Shaft Support: They are commonly used by Original Equipment Manufacturers (OEMs) for new machines, providing a dependable and easily replaceable standard component for various shaft support needs.

Shop Pillow Block Bearings at RS Australia

Acquiring your pillow block bearing units from RS Australia’s digital platform is a straightforward and dependable process. Our extensive online catalogue offers a wide selection of top-quality plummer blocks and pillow block housing solutions — as well as related products such as wrench tools and measuring tape — from leading brands such as SKF and FAG. Once you’ve selected your preferred products, simply proceed to checkout via any of our convenient online payment options.

When you purchase your plummer blocks from us, you're investing in quality assurance and expert technical support. This, coupled with our competitive prices, ensures you get the best value without compromising on durability or performance.

Additionally, our streamlined delivery services ensure the swift, nationwide doorstep delivery of your products across Australia. For complete specifics on dispatch timelines, applicable charges and available shipping choices, kindly consult our dedicated Delivery Page today.