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Lot tested, certified and tagged
Types of Babbitt
 | Tin based Babbitt (#2) is approximately 89% tin with the remainder
being antimony and copper. The hardness of this alloy gives excellent
load-carrying characteristics. |
| Lead based Babbitt (#7) is 75% or more lead.
Conventional lead- base Babbitt contains antimony and tin, which greatly
increase the strength and hardness of lead. This alloy is fully
adequate for lower loads and moderate temperatures. |
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Some 6 other types, though not generally used, are available to address specific needs. See our
chart on "Types of Babbitt" |
Conformity
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The
material creeps or flows slightly under load in the initial stages of running.
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The shaft and bearing contours conform with each other to
compensate for non-uniform loading present from misalignment. |
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Under
poor lubricating conditions, an alloy of good conformity and run-in behavior is
required. |
Characteristics
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Tin-base Babbitt shows low friction resistance, low wear, good run-in properties and
good emergency behavior in the absence of adequate lubrication. |
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Lead-based Bobbitt's
good frictional properties and reasonably good corrosion resistance
makes them ideal for a wide range of applications |
Thermal Conductivity
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Babbitt has high thermal conductivity which is required to absorb and
carry away generated heat. When frictional heat generated in bearings is
removed, local hot spot seizures caused by roughness or foreign
particles, are prevented. |
Compatibility
| Babbitt is extremely compatible with shaft materials. It resists
seizing or galling under conditions of metal to metal contact at start up.
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Other information
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Babbitt has good load carrying capacity between 800 PSI and 1500 PSI
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Maximum operating temperature for Babbitt is 300º
F. In motors 180º F to 190º F is considered running hot. Some
turbine applications run as high as 225° F. Many technicians however,
will set the alarm at 185º F and trip at 205º F.
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Melting temperature for common Babbitt varies from 350º
F to 475º F
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| Special bonding techniques are required to
metallurgically bond Babbitt to metal |
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Babbitt Bearing Repair and Manufacturing 