Manufacturer of custom machined parts

Cast C86300

Manganese bronze alloys, such as C863, can operate under very high loads and speeds. However, bearing applications require reliable lubrication. Besides excellent mechanical qualities, these alloys have good corrosion resistance. The combination of copper, manganese, aluminum and iron in C86300 raises its tensile strength to over 110,000 KSI.


Product description: Manganese Bronze
Solids: 1/2" to 9" O.D.
Tubes: 1 1/8” to 9” O.D.
Rectangles: Up to 15”
Standard lengths: 144”
Shape/Form: semi-finished, mill stock or near-net shapes, anode, bar stock, billet/bloom, squares, hex, plate, profile or structural shape, flats/rectangular bar

Typical uses

ELECTRICAL: electrical components, switches
Fasteners: screw down nuts
Industrial: bridge pins, bushings, cams, forming dies for wood pulp industry, frames, gears, gib, high-strength machine parts, hooks, hydraulic cylinder parts, large valve stems, propellers, slow-speed/heavy-load bearings, struts, wear rings for forming dies for wood pulp industry
MARINE: boat parts, clamps, covers for marine hardware, marine hardware, rudders

Similar or equivalent specification

C86300B505 B505M
B271 B271M
J461 J462QQ-C-523MIL-C-11866

Chemical composition


Chemical composition according to ASTM B505/B505M-23

¹In determining Cu min., Cu may be calculated as Cu + Ni. ²Ni value includes Co.
Note: Cu + sum of named elements, 99.5% min. Single values represent maximums.


Copper alloy UNS no.Machinability ratingDensity (lb / in³ at 68°F)

Mechanical properties

Tensile strength, minYield strength, at 0.5% extension under load, minElongation, in 2 in. or 50 mm minBrinell hardness (500 kg load)Remarks
ksiMPaksiMPa%typical BHN

Mechanical properties according to ASTM B505/B505M-23
Note: Compression Deformation Limit min 55 ksi/380 MPa

Physical properties

US CustomaryMetric
Melting point - liquidus1693 °F 923 °C
Melting point - solidus1625 °F 885 °C
Density0.283 lb/in³ at 68 °F 7.83 gm/cm³ at 20 °C
Specific gravity7.837.83
Electrical conductivity8% IACS at 68 °F 0.046 MegaSiemens/cm at 20 °C
Thermal conductivity20.5 Btu/sq ft/ft hr/°F at 68 °F 35.5 W/m at 20 °C
Coefficient of thermal expansion 68-57212 · 10-6 per °F (68-572 °F)20.7 · 10-6 per °C (20-300 °C)
Specific heat capacity0.09 Btu/lb/°F at 68 °F377.1 J/kg at 20 °C
Modulus of elastic in tension14200 ksi97900 MPa
Magnetic permeability*1.091.09

Fabrication properties

Oxyacetylene weldingPoor
Gas shielded arc weldingPoor
Coated metal arc weldingPoof
Machinability rating8

Thermal properties

Stress relief500
Solution treatment0

Thermal properties provided by CDA

*Temperature is measured in Fahrenheit. **For stress relief, solution treatment and annealing - time is measured in hours/inch of thickness. For precipitation heat treatment - time is measured in hours.

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