Reference guide

Continuous cast

Leaded tin bronze alloys are free cutting and retain favorable thermal conductivity and good lubricity due to the presence of lead. Alloy C93200 is considered this family’s workhorse alloy and is widely used in many bearing applications.


Product description: Leaded tin bronze
Solids: 1/2" to 13" 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

 *Consult mill for wall thickness

Typical uses

Fasteners: lead screw nuts
Industrial: bearings, bushings, gears, heavy-duty bearings, pump impellers, pump pistons, steam fittings

Similar or equivalent specification

CDA ASTM SAE AMS Federal Military Other
C92700 B505

Chemical composition

Cu%1 Pb% Sn% Zn% Fe% P% Ni%1,2 Al% S% Sb% Si%
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, 99.3% min. Single values represent maximums.


Copper alloy UNS No. Machinability rating Density (lb/in3 at 68 °F)
C92700 45 0.317

Mechanical properties

Mechanical properties according to ASTM B505/B505M-23
Tensile strength, min Yield strength, at 0.5% extension under load, min Elongation, in 2 in. or 50 mm min Brinell hardness (500 kg load) Remarks
ksi MPa ksi MPa % typical BHN  
38 252 20 138 8 77

Physical properties

Physical properties provided by CDA
  US Customary Metric
Melting point - liquidus 1800 °F 982 °C
Melting point - solidus 1550 °F 843 °C
Density 0.317 lb/in3 at 68 °F 8.78 gm/cm3 at 20 °C
Specific gravity 8.78 8.78
Electrical conductivity 11% IACS at 68 °F 0.064 MegaSiemens/cm at 20 °C
Thermal conductivity 27.2 Btu/sq ft/ft hr/°F at 68 °F 47 W/m at 20 °C
Coefficient of thermal expansion 68-392 10 · 10-6 per °F (68-392 °F) 17.3 · 10-6 per °C (20-200 °C)
Specific heat capacity 0.09 Btu/lb/°F at 68 °F 377.1 J/kg at 20 °C
Modulus of elasticity in tension 16000 ksi 110000 MPa
Incipient Melting 600 °F 316 °C

Fabrication properties

Fabrication properties provided by CDA
*Since brazing is performed within the hot-short range, strain must be avoided during brazing and cooling.
Technique Suitability
Soldering Excellent
Brazing* Good
Oxyacetylene welding Not recommended
Gas shielded arc welding Not recommended
Coated metal arc welding Not recommended
Machinability rating 45

Thermal properties

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.
Treatment Value* Time**
Stress relief 500  
Solution treatment   0

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