Manufacturer of custom machined parts

Cast C90700

Tin bronze alloys, such as C90700, are typically found in gear, high-strength bushing and bearing applications where low speeds and heavy loads are present. Other high-strength applications for these alloys include pump impellers, piston rings, steam fittings and valve bodies. C908 tin bronze castings are utilized in movable bridge components, turntables for bridges and other structures for fixed and expansion bearings with slow or intermittent movement with heavy loads.


Product description: Tin bronze
Solids: 1/2" to 10" O.D.
Tubes: 1” to 16” O.D.
Rectangles: Up to 20”
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

Industrial: bearings, bearings for heavy loads and relatively low speeds, gear boxes, gears, restaurant equipment, speed reducers, valve bodies, worm gears, worm wheels

Similar or equivalent specification

C90700B505 B505M65 J461 J4624845Tin bronze, 65

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, 99.4% 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

Physical properties

US CustomaryMetric
Melting point - liquidus1830 °F 999 °C
Melting point - solidus1528 °F 831 °C
Density0.317 lb/in³ at 68 °F 8.77 gm/cm³ at 20 °C
Specific gravity8.778.77
Electrical conductivity10% IACS at 68 °F 0.056 MegaSiemens/cm at 20 °C
Thermal conductivity40.8 Btu/sq ft/ft hr/°F at 68 °F 70.6 W/m at 20 °C
Coefficient of thermal expansion 68-57210.2 · 10-6 per °F (68-212 °F)18.4 · 10-6 per °C (20-100 °C)
Specific heat capacity0.09 Btu/lb/°F at 68 °F377.1 J/kg at 20 °C
Modulus of elastic in tension15000 ksi103400 MPa
Magnetic permeability11

Fabrication properties

Oxyacetylene weldingFair
Gas shielded arc weldingFair
Coated metal arc weldingFair
Machinability rating20

Fabrication properties provided by CDA
*Since brazing is performed withing the hot-short range, strain must be avoided during brazing and cooling.

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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