Babbitt

What is Babbitt?

Babbitt metal is any of several tin or lead-based alloys used as bearing material for axles and crankshafts, based on the tin alloy invented in 1839 by Issac Babbit for use in steam engines. Modern babbitts provide a low-friction lining for bearing shells made of stronger metals such as cast iron, steel, or bronze.

They may be made of:

  • high-tin alloys with small quantities of antimony and copper;
  • high-lead alloys containing antimony, arsenic, and tin; and
  • intermediate tin-lead alloys with antimony and cooper.

Babbitt & Type Compositon Chart

Name ASTM Pb – Lead Sn – Tin Sb – Antimony Cu – Copper Zn – Zinc
Hoyts > >- >90% >7% >3% >-
Nickel Gen. >2 >- >88% >8% >4% >-
Imperial Gen. > >- >86% >7% >7% >-
Crusher > >24% >60% >14% >2% >-
Planer > >59% >32% >9% >- >-
Harries Heaby >7 >74.85% >10% >15% >0.15% >-
Star Friction > >83% >5% >12% >- >-
Silvertone > >80% >2% >18% >- >-
Choker > >93% >- >7% >- >-
Under Water > >- >69% >- >1% >30%
HU Speed > >69% >15% >16% >- >-
CT Babbitt > >71% >10% >19% >- >-
Sae 11 > >- >86% >7.50% >6.50% >-
Turbine > >- >85% >7% >8% >-
Mill Anchor > >83% >5% >12% >- >-
Magnolia Def. > >81% >6% >13% >- >-
Marine > >19% >77% >2% >2% >-
Thermitt > >78% >7% >14% >1% >-
Gotta Verken > >2% >82% >11% >5% >-
Sp . Saw Guide > >71% >10% >19% >- >-
#4 ASTM 1959 > >10% >75% >12% >3% >-
Super Though >3 >- >83% >8.50% >8.50% >-
#4 Regular >15 >88% >2% >10% >- >-
Linotype >8 >84.60% >4% >11.40% >- >-
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