10 Pillow Block Manufacturers in 2023
This section provides an overview for pillow blocks as well as their applications and principles. Also, please take a look at the list of 10 pillow block manufacturers and their company rankings.
Table of Contents
What Is a Pillow Block?
A pillow block is a bearing unit that houses bearings. They are installed in various machines by being mounted to sandwich bearings and rotating parts from both sides. They are mainly made of metal and vary in shape and material depending on the uses of the machine and the surrounding environment. These devices are used to protect the interior from rain, wind, and temperature, and are incorporated into not only large equipment but also commonly used transport machines. In recent years, development of pillow blocks that can handle high-speed rotation and high loads has been progressing.
Uses of Pillow Blocks
Pillow blocks are used to protect bearings and rotating parts. Many machines incorporate rotating parts such as gears and motors, which require bearings to support them and pillow blocks to protect these two parts. Rain, wind, and dust can affect the rotational motion, especially when installed outside. Pillow blocks are used to minimize external influences. They are also used to prevent high temperatures and increased loads associated with high-speed rotation.
Principle of Pillow Blocks
Pillow blocks are installed to protect the rotating elements and bearings, and they come in a variety of shapes depending on their application. Here are some of the principles and features of the pillow blocks.
- SN Type
This is the most common form of pillow blocks. It has one groove for an oil seal and two screw holes for installation. It is used in a variety of machines, and waterproof and dustproof types are also available. - SD Type
This type is used in places where a particularly heavy load is applied. It has two grooves for oil seals and four screw holes for mounting. The increased number of screw holes makes it possible to mount the seal more firmly and withstand a greater load. This type is mainly used for the drive shafts of large machines. - V Type
This type is integrated with a cover. In general, the upper cover is attached after the main body of the pillow blocks is installed, but the V type is an integrated type, so it requires less time and effort. There is one groove for an oil seal and four screw holes for mounting. The cover bore can be lowered to accommodate a variety of bearings.
Difference Between Pillow Blocks and Plummer Blocks
Both pillow blocks and plummer blocks are bearing cases, but there are major differences. One is whether only the bearings can be replaced. In most cases, pillow blocks have a structure of two pieces that can be separated and the bearing itself can be taken in and out of the case. Plummer blocks, on the other hand, have the bearings fitted into the case, so basically all of them need to be replaced. What is obvious from this difference is the cost aspect. In the case of pillow blocks, the case can continue to be used as is if the internal bearings are replaced (except in the case of major damage), but in the case of plummer blocks, the entire case must be replaced, so the cost of the case is incurred for each replacement.
In terms of maintenance, there is no significant difference between the two types of bearings, since the shaft needs to be pulled out once when replacing a bearing. However, there is a big difference when you want to check the condition of the bearings. In the case of pillow blocks, the bearings can be visually checked by opening the upper case. In the case of plummer blocks, the condition of the bearings cannot be checked as easily as with pillow blocks because of the need to pull them out of the case.
Some pillow blocks and plummer blocks come with grease nipples for greasing the bearings, while others do not. This depends on the type of bearing. For grease-filled type bearings, which are pre-filled with grease inside, there is no need to grease up the bearing after installation. For this reason, there is no nipple attached to the case. On the other hand, it is important to remember to grease up the non-encapsulated type.
Material of Pillow Blocks
The materials used for pillow blocks are cast iron and spheroidal black smoked cast iron. Since both are cast iron, they are vulnerable to impact and break easily, so they must be handled with care. For larger pillow blocks, the bolts are also larger, and high-strength bolts such as SCM435 are used to ensure higher bolt strength. Since bolts loosen due to vibration, periodic loosening checks and retightening are necessary. Care must be taken not to break the pillow blocks by over-tightening.
List of 10 Pillow Block Manufacturers
*Including some distributors, etc.
Sort by Features
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- Company Size: largest first
- Year Founded: oldest first
- Year Founded: earliest first
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- United States of America
- China
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A.S. International
UCP205 Pillow Block Bearing
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Nishi Enterprise
Plummer Block
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Collective Trade Links Pvt. Ltd
Pillow Block Bearings
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Preci-max Motion Tech
UCPA Pillow Block Bearing
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BDH Bearings
pillow block bearing
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Marvel Engineering Works
Cast Iron Pillow Block Bearing
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Pillow Block Manufacturer Ranking
*Including some distributors, etc.Number of Employees
Newly Established Company
- THB Bearings Co.Ltd: 2009 (14 years ago)
- Triangle Manufacturing Company: 1922 (101 years ago)
Company with a History
- Triangle Manufacturing Company: 1922 (101 years ago)
- THB Bearings Co.Ltd: 2009 (14 years ago)
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