1. Introduction

Engine bearings (also known as plain shaft or sleeve bearings) are assembled with crankshaft, connecting rod, and camshaft, and the role is to convert reciprocating motion of the piston, and rotate crankshaft, which is connected by suitable gearing to the drive wheel of the vehicles. Engine bearings are used in various types of machinery, under widely different conditions. Though the properties required of bearings cover a very broad range, bearing material is the most important factor of bearing quality, unless bearing size exceeds tolerance limit. A bearing material that is well suited for one application may be entirely useless in another. A good bearing material cannot be defined in general way but must be determined according to the type of application.

Characteristic of all sleeve (plain) bearings is the sliding movement of the shaft (or thrust collar) surface with respect to the bearing surface, in contrast with bearings that have rolling contract. In order to reduce the friction that results from this sliding movement, the bearings are lubricated with oil or grease.

With ideal conditions of lubrication, a continuous oil film should be maintained between the sliding surface; consequently, the material of the bearing surface would be quite unimportant. However, under actual conditions of bearing operation, some direct contact between shaft and bearing surface is unavoidable.

As a result, the "bearing qualities of the material" forming the bearing surface are actually of paramount importance. Also, the various bearing materials show considerable difference in their ability to maintain a continuous oil film at the working surface.

With accumulated technology and our own materials, Best Metal Works produce the most appropriate bearings as per the type of application.

2. Our Materials

Our ref. No.		Compo.	Features & Applications	Remarks
Babbit	WM 1	Sn 89% Cu 3.5% Sb 7.5%	This is a tin-base material with good fatigue properties and excellent corrosion resistance, conformability and embedability characteristics.	Similiar to SAE 12 & JIS WJ1
	WM 10	Pb 84% Sn 1% Sb 15%	This lead- base babbit has good confirmability and embedability characteristics. It has been used extensively in automotive engines and trnasmission in America and Europe, and has a long history of successful use.	Similiar to SAE 15 & JIS WJI0
Aluminum	AA-20	Sn 20% Cu 1% Al 79%	AA-20 is recommended as an intermediate load-carrying material has excellent resistance to corrosion and is capable of withstanding all temperatures encountered in present engine.	Our own development Similiar to SAE 783 & CGB-F151
	AA-6	Sn 6% Cu 1% Si 0.7% Al Bal.	This solid bearing and bushing material has a high load carrying capacity and is used for the tractor engine bearings and bushings.	Our own development Similiar to SAE 780 & CGB- F81
	AA-7	Sn 6% Cu 1% Si 1.5% Ni 0.5% Al Bal.	This bimetal bearing material has excellent load carrying capacity and fatigue resistance. It is suitable for diesel engine bearings with or without an overlay plate	Our own development Similiar to CGB- F147
Copper Lead	KM 4	Sintered Cu 75 % Pb 25 % (With overlay)	This is a trimetal sintered copper-lead with 25μ overlay which provides high load carring capacity for heavy duty application.	Similiar to SAE 49, CGB-F770 and JIS KJ4
	PbBrC3	Sintered Cu 80 % Sn 10 % Pb 10 %	Thist is most widly used and versatile material used for bushing application with very high shock and load carrying capacities as well as good corrosion resistance. It's also widely used for thrust washers.	Similiar to SAE 792, CGB-F17 and JIS LBC3
	PbBrC6	Cast Pb 25 % Sn 3 % Cu Bal. (With overlay)	This is a trimetal cast copper-lead material with a 25μ lead tin copper overlay, has good corrosion resistance and very high load carrying capacity. It is widely used in heavy duty automotive, truck, locomotive, and diesel engines.	Similiar to SAE 49, CGB-F77 and JIS LBC6

3. Product Information

We are component manufacturer of major customers, and also specialize in replacement bearings for Korean & foreign passenger cars, trucks, heavy equipments, and vessels. More than 40 years specialized & accumulated technology will serve you with;