Babbitt Bearings

Prime Machine specializes in Babbitt bearings.  Our capabilities include both centrifugally cast and statically cast of Babbitt bearings.  Our spin fixture is capable of spinning bearings weighing 10 tons and 150 inches in diameter.  Our proprietary methods allow us to achieve 100% bonds and porosity free bearings.  All bearings are checked dimensionally using three dimensional measurement technology to verify both bore and housing fits.  Radial load, thrust, tilting pad bearings are all rebuilt by Prime craftsmen experienced in providing quality products.

We repair and rebuild all types of Thrust, Sliding, and Radial Babbitt Bearings:

babbitt bearing reverse engineered

Babbitt Bearing reverse engineered scanned using laser scanner technology then modeled using specialized software to create surfaces and three dimensionally modeled for casting and machining.



babbitt bearing centrifugally cast and machined

turbine babbitt bearing spun cast and machined. fully inspected three dimensionally with laser measurement.

thrust babbitt bearing pads

Babbitted bearing thrust pads cast and machined.

 Centrifugally casting babbitt bearings & Ultrasonic testing of bond.
centrifugally cast hydro babbitt bearing

Large babbitt bearing being centrifugally cast.

Centrifugally casting of hydroelectric turbine babbitt bearing with 54″ journal.

thrust bearing testing

Ultrasonic testing of thrust bearing out of large raw mill gear box.

Full in house Pouring, Machining, and Inspection means rapid turn around.
mill babbitt bearing

Mill babbitt bearing rebuild. Bearings are measured on arrival and housing fits verified. Bearing cast to provided maximum bond strength and no proisity. Machined to size, inspected, and packaged for shipping.

Types Of Babbitt Commonly used
Babbitt has good load carrying capacity between 800 PSI and 1500 PSI

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.

Melting temperature for common Babbitt varies from 350º F to 475º F
bullet Special bonding techniques are required to metallurgically bond Babbitt
to metal.

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. 
Tin Based Babbitt
Composition of Babbitt Lining Load VS Temperature
ID % Sn % Sb % Pb % Cu 68° F 212° F
#1 91.0 4.5 4.5 4400 2650
#2 89.0 7.5 3.5 6100 3000
#3 83.3 8.3 8.3 6600 3150
#11 87.0 7.0 6.0
Lead Based Babbitt
Composition of Babbitt Lining Load VS Temperature
ID % Sn % Sb % Pb % Cu 68° F 212° F
#7 10.0 15.0 75.0 3550 1600
#8 5.0 15.0 80.0 3400 1750
#13 6.0 10.0 83.5 0.5
#15 1.0 16.0 82.4 0.6