“ARROW” Brand Engine Bearings are made up of best quality steel back lined with different kinds of Alloys best suitable for the applications for which the bearings are used.

With an experience of over 50 years we have developed 4 types of different Alloys which are then bonded to a steel back to produce the finished product.

A bearing surface has to be strong to withstand high oil filling pressures.  It needs to be hard to minimize wear and prevent failure from fatigue.

In contrast, a bearing surface needs to be soft to allow the bearing to tolerate the shaft and sustain when the Cylinder Block distortion occurs and thereby protect the journal as well  from damage by absorbing hard foreign particles. The Bearing materials being used by us are:

A bearing surface has to be strong to withstand high oil filling pressures. It needs to be hard to minimize wear and prevent failure from fatigue.

In contrast, a bearing surface needs to be soft to allow the bearing to tolerate the shaft and sustain when the Cylinder Block distortion occurs and thereby protect the journal as well from damage by absorbing hard foreign particles. The Bearing materials being used by us are:

• (Babbitt) White Metal Tin base having 90% Tin, 3% Copper and 7% Antimony. This is for low load applications specially used for high speed engines with light loading as in automobiles, time tested.
   

• (Babbitt) Lead Base Alloy having 83% Lead, 1% Tin, 1% Arsenic and 15% Antimony. Lead base bearings are cheaper than Tin base bearings and satisfactory for operation at medium and low speeds. The presence of soft matrix in this Alloy provides frictional properties. Its soft matrix is easily extended and smeared out during sliding and form a thin lubricating film. This accounts for the low friction of the bearing, since the shearing stress of the soft matrix is low. Hard crystals dispersed in the soft matrix impart the hardness to the Alloy, but they do not affect its frictional properties. Any grit and abrasive particles incidentally present are embedded in the soft matrix, thus any possible scratching effect on the steel shaft is eliminated.
   

• Aluminium Base Alloy Aluminium Bearings are either of Cast Solid Aluminium, or Aluminium with Steel Backing or Aluminium with a suitable overlay. An Aluminium Bearing Alloy has shown promises as a substitute for bronzes in some industrial applications. These bearings are best suited for operation with hard journals. Due to high thermal expansion of the metal (which results in diametric contraction when it is confined as a bearing in a rigid housing), large clearances are required.
   

• Copper Lead Alloy : Copper Lead Alloy consists of a continuous matrix of harder metal (Copper) with a small amount of softer metal (Lead). The Lead particles are finely spread throughout it. The Copper Lead Alloys owe their frictional properties to the spreading of thin film of soft lead over the surface of hard copper. These Alloys are stronger than the Babbitt. This Alloy is highly recommended for good fatigue strength, high load capacity and performance at high temperatures. A very thin layer of lead is sometimes electroplated to the finished bearings to enhance the surface properties. This is known as an overlay.