High Leaded Tin Bronze: C93700 Bearing Bronze (SAE 660)

by | Jun 23, 2017 | metals

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Bronze is available as different blends or alloys. Such alloys can contain nickel, lead, and tin. The high leaded tin bronze alloy is popular for bearings for certain applications. The amount of lead may range from 7 percent to 30 percent. The various types offered include C93400, C93600, C93700, and C94000. From this list, one of the more popular types in use is C93700.

The Qualities of C93700 Bearing Bronze

Suppliers and manufacturers also know C93700 as SAE 64 and 80-10-10 bronze. The numbers reflect its content proportions of copper, tin, and lead. It also contains traces of zinc. This alloy has the following favorable qualities that make it attractive for use in bearings for particular environments:

Natural lubricity – as a result of the lead

Excellent strength – resulting from the tin

Superior machinability – the rate is 80

Good anti-friction properties

Good corrosion resistance – particular to paper mill sulfite and mildly acidic mine waters as well as brine and seawater

Excellent wear resistance – even under conditions of high speed, vibration, and heavy pressure

Low friction

Free cutting

Satisfactory thermal conductivity

Such characteristics as good solder ability also increase the attractiveness and suitability of this alloy.

General Applications

Bearings

Bearing plates

Bushings

Brackets for construction

Crankshafts

nuts

Pump impellers

Washers for engines

High Leaded Tin Bronze Bearing Applications

As bearings, certain restrictions prevail. High lead tin bronze bearings must have a hardened shaft. The maximum shaft speed can be as high as 4 m/sec. If the installation procedures and precautions are adhered to, this alloy can easily become an integral part of several different types of applications. The most common usage of such bearings is for

Corrosion resistant applications

Impellers

Marine parts

Parts for steel mill maintenance

Pressure type castings

Pumps

Overall, high leaded tin bearings are excellent wherever the environment is problematic with such problems as dirt, grime, and other contaminants.

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