Manganese Bronze Sand Castings Foundry | LB Foundry
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Manganese Bronze Sand Castings

Leitelt Brothers designs and manufactures manganese bronze sand castings known for their high quality and superior workmanship. We offer a full range of Value-Added Services and Additional Capabilities that can be added to any project.

Manganese bronze and white manganese bronze alloys are comprised of:

  • 55 to 65% Copper (Cu)
  • 20 to 25% Zinc (Zn)
  • 1 to 5% Manganese (Mn)
  • 1 to 5% Iron (Fe)

These alloys have good corrosion resistance, high strength, high wear, and good mechanical properties.

Leitelt Brothers manufactures three common grades of manganese bronze alloys:

  • CA86300  (424) High Strength - 110, 000 Tensile
  • CA86500  (421) High Strength - 65,000 Tensile
  • CA99700 (Tombasil) White Manganese Bronze

CA86300 Typically used for screw down nuts, slow-speed, heavy load bearings, gears, and cams.

CA86500 Typically used for propellers, machinery parts substituting for steel or malleable iron

CA99700 Typically used for ornamental castings, marine hardware, and excellent corrosion resistance.

manganese bronze castings manganese bronze castings manganese bronze castings

Click to enlarge the following sample Manganese Bronze work.

Mechanical Properties


Tensile Strength



Yield Strength






Brinell Hardness 10MM-500
Machinability Free Cut YB-100
C86300 110 120 60 83 12 18 225 8
C86500 65 70 25 28 20 30 130 26
C99700 60 70 30 35 16 20 115 80

Chemical Composition

Alloy CU. SN. PB. ZN. NI% FE% AL% Other%
C86300 63     25 rem   3 6  
C86500 58 5   40   1 1 Mn-.25
C99700 55 1   20 4 1 2 Mn-4

Typical Applications

C86300 Screw down nuts, heavy load-bearing gears, & cams.
C86500 Propellers, Machinery Parts substituting for Steel & Malleable Iron.

Marine Hardware, Steering Linkage, Eye Bolts, Bells Corrosion Resistant Parts & Ornamental Castings.

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