Machinery Mandates: Why bearings are essential for most modern equipments

Bearings, in general, are described as an important machine element that can be considered to be indispensable for the functioning of a machine. In bookish terms, relative motion is reduced by the bearings to achieve the requisite amount of motion which is desired in a machine.

Sleeve bearings, also known as plain bearings have the simplest form in terms of design as well as the components used in their functioning. They do not have any extra rolling elements attached to their bodies and have a plain surface, which is probably the reason they are widely known as plain bearings. Plain bearings have a huge load-carrying capacity, are relatively cheaper compared to other forms of bearings and have a comparatively longer life as well.

Sleeve bearing materials used during the manufacturing process: Sleeve bearings in bronze steel or iron are available, and the price varies depending on the raw material used to make the end product.

Sleeve bearing lubrication: Self-lubricating sleeve bearings are the most sought-after models available in the market and the reason behind their popularity is that they help to save precious time which would have been spent in manual lubrication. We offer self-lubricating sleeve bearings, which have a number of useful functionalities and are utilized for a number of applications.

Sleeve bearing applications: There are numerous industries in which sleeve bearings are used. The automobile industry is a very good example, because all kinds of cars, vehicles- their parts as well as machinery are inherently dependent on sleeve bearings. Proper engineering equipment is useless without sleeve bearings. Sports and fitness equipment also have a mandatory requirement for sleeve bearings.

Sleeve bearings vs ball bearings: Ball bearings are used for drastically different applications than sleeve bearings. They are smaller in size than sleeve bearings and are able to carry much less load. They are recommended for sophisticated users, such as hard drives and similar technical equipment and should not be subjected to excessive pressure or toughness, because they can handle very little weight and will get permanently damaged after a sufficient amount of wear and tear.

We are an ISO (International Standards Organization) 9001 certified brand, specializing in the manufacture, production, marketing, packaging, and final doorstep delivery of sleeve bearings, slide bearings and other standard products which are self-lubricating, offer ease of use and are at a sustainable price. At each and every step, we have qualified experts and personnel who overlook the entire operation and provide an adequate level of guidance to the next level employees for more efficient and quick functioning. We have cutting-edge technology used in our own factories where the entire process is overlooked. Highly specific machinery and equipment are used for different products, which include flanged sleeve bearings and metric sleeve bearings. One of the most popular products offered by us is sleeve bearing bushings which have proved to be very effective and in fact, indispensable over the years. We have over 10 years of experience in the slide bearing design and guarantee quality products that are delivered on a timely basis.


Factors which help to select the right bronze bearings

Bronze as an alloy is one of the most versatile and commonly used materials for flanged bronze bushings because it comes in a plethora of alloys and compositions. Apart from being just versatile, bronze and its alloys are extremely durable, sturdy, ductile, and a lot less brittle than tough elements such as cast iron making them the most suitable candidate to be used in the manufacturing of machinery parts, used directly in machinery such as diesel engines, food processing, pumps, etc. As an alloy, bronze is not directly used in its natural form, but rather in the form of certain structures known as bronze sleeve bearings.
Being so versatile and displaying a wide variety of properties, selecting the right kind of bronze to suit your needs involves ensuring the following factors-


  • Design

A good design for bronze bearings is substantially comprised of 3 primary factors- the environment, proper lubrication, and the best material suited for it. The environment of any 2 industries cannot be completely alike in any manner and creating the right lubrication cycle for the bearings cannot be completely overemphasized, which means that for different sets of jobs, a different type of bearing has to be used. For example, in propeller shafts, brass flange bushings are used simply because they don’t rust, in powder metallurgy, high and low-temperature machinery, food-grade applications, solid bronze bearings are used.



  • Bushing clearance

Bearings and bushings are subject to a lot of expansions, compressions, and interference; and due to the radial motion of the shaft inside the bearings, there has to be maintained a safe distance between them both so that the motion of the shaft does not lead to situations where it starts getting in contact to an already dynamic bearing.  This safe distance between the two is what is known as bushing clearance and is a factor that bronze bearing manufacturers have to pay a lot of attention and detail.



  • Loading

Yet another important factor to keep in mind is how much weight and stress shall the bearing be subjected to. Maximum load on a bearing is industrially counted in psi (pounds per square inch) and for a rough approximation, it is close to 1/3rd of the compression limit of the bearing material.



  • PV value

The name may not signify much, but PV value is without a shadow of a doubt the most important factor that both manufacturers, as well as buyers, look into before making a purchase. It is the indication of how much return can be or would be returned on the money invested and is also the detrimental factor in the service life of the bearings.
The PV value is simply a product of the specific load (P) and the sliding speed (V) of the bearing. A lower PV value is an indication of a long life and vice versa.

  • The sliding speed (V) is calculated as- (0.262 (pi/12) x RPM x shaft diameter)


  • The specific load (P) is calculated as- (total load / projected area)

Multiplying the values obtained from the above formulae gives the PV value of your bearing in question. For example, bronze flanged sleeve bearings are made out of Cast Bronze C93200 and has a PV value of 75,000- the best number ever punched in the industry.


What is Plain Bearing?

A plain bearing is a mechanical part that is charged for bearing loads and allows rotational or sliding moments between two machine parts. It is also called a plain bearing bushing. It is a cylindrical sleeve used to bear loads of light to moderate intensity. Over a shaft, it can slide axially or radially allowing linear or rotary motion between shafts. The main purpose of using plain bearing and sleeve bearing is that the point of support should be free from any wear and tear while the shaft is directly rolled to the machine structure. Plain bearing material is very durable and is composed of only two parts in which the first one is a fixed part where the support is and the second one is in contact with the bush which is the moving part. The support is the main point of load-bearing while the bush part gets worn out due to the frequent motion.

plain bearing

What are its types?

  • Sleeve Bearing – This is the most commonly used plain bearing which supports linear shafts, rotating shafts and oscillating shafts and functions through a sliding action.
  • Mounted Bearing – It is specially designed according to the specs to get an ideal fit. If there is a loose fit, then creep or slippage can happen in mounted bearings and if there is a very tight fit, then it will affect the free movement of the shaft.
  • Spherical Bearings – It allows angular motion between the control arms and linkages. It rotates in two directions to compensate for any misalignment of the shafts.
  • Flange Bearings – This bearing supports a shaft running perpendicularly to the mounting surface of the bearing. The flange is also known as the rim of the bearing and is used as the locating medium to hold down the position of the sleeve bearing in its place.
  • Thrust Bearings – It is used to prevent any metal to metal contacts in the application of thrust loads. These are very thin and easy to install on a shaft mechanism. It is a self-lubricating type to reduce any extra maintenance expenses.

What are its Advantages and Disadvantages?

The plain bearing design is very basic and it possesses numerous numbers of advantages with a few disadvantages.


  • Lightweight
  • Low cost
  • Produces less noise than other bearings
  • Simple installation
  • High shock resistance, providing better durability
  • Allows high rotational speeds
  • Plain bearing lubrication not required when using self-lubricating bearings


  • High friction during the start-up process
  • Requires large axial space
  • Friction resisting materials used by plain bearing manufacturers are indispensable
  • High wear in comparison with roller bearings

Plain Bearing Applications

Plain bearing bushing relies on full fluid lubrication which is theoretically capable of working indefinitely. It is used in very critical applications where the failure of bearings can lead to a massive failure of the whole mechanism and can’t be sustained. Generally, it is mostly used in engines and turbomachines like steam turbines of power plants, ship propeller shafts, compressors in pipeline operations and many more types of machinery for aerospace and automobile industries. Plain bearing manufacturers even make bearings for special purposes with different specifications too.