celebrating 51 years
in business

"Atlas, thanks for your help on locating the materials I needed for my project. I will be back." - Henry Levenson

Non Ferrous
to the Art

Atlas Metal Sales was founded in 1975 as an aluminum ingot distributor.

Silicon Bronze

Copper Alloy No. C65500 (High Silicon Bronze A)

Composition - Percent

  Nominal Minimum Maximum
Copper 97 Remainder
Lead - - 0.05
Iron - - 0.80
Zinc - - 1.50
Manganese - 0.50 1.30
Silicon 3 2.80 3.80
Nickel - - 0.60

Nearest Applicable A S T M Specifications

Bolts F468
Flat Products B96, B98, B100, B124, B432
Nuts F467
Pipe B315
Rod B98, B124
Screws F468
Shapes B98, B124, B283
Studs F468
Tube B315
Wire B99, B105

Physical Properties

  English Units C.G.S. Units
Melting Point (Liquidus) 1880°F 1025°C
Melting Point (Soluidus) 1780°F 970°C
Density .308lb / cu in @ 68°F 8.53 gm / cu cm @ 20°C
Specific Gravity 8.53 8.53
Coefficient of Thermal Expansion per °F from 68°F to 212°F per °C from 20°F to 100°F
Coefficient of Thermal Expansion per °F from 68°F to 392°F per °C from 20°F to 200°F
Coefficient of Thermal Expansion .0000100 per °F from 68°F to 572°F .0000180 per °C from 20°F to 300°F
Thermal Conductivity 21 Btu / sq ft / ft / hr / °F @ 68°F 0.9 cal / sq cm / cm / sec / °C @ 20°C
Electrical Resistivity (Annealed) 148 Ohms (circ mil / ft) @ 68°F 24.6 Microhm-cm @ 20°C
Electrical Conductivity* (Annealed) 7.0 % IACS @ 68°F .0406 Megmho-cm @ 20°C
Thermal Capacity (Specific Heat) 09 Btu / lb °F @ 68°F .09 cal / gm / °C @ 20°C
Modulus of Elasticity (Tension) 15,000 ksi 10,500 Kg /sq mm
Modulus of Rigidity 5,600 ksi 3,900 Kg /sq mm

*Volume Basis

Typical Uses


hydraulic pressure lines


bolts, burrs, butts, clamps, cotter pins, hinges, marine hardware, nails, nuts, pole line hardware, screws


bearing plates, bushings, cable, channels, chemical equipment, heat exchanger tubes, kettles, piston rings, tanks, rivets, screen cloth and wire, screen plates, shafting


propeller shafts

Common Fabrication Processes

Blanking, drawing, forming and bending, heading and upsetting, hot forging and pressing, roll threading and knurling, shearing, squeezing and swaging

Fabrication Properties

Capacity for Being Cold Worked Excellent
Capacity for Being Hot Formed Excellent
Hot Forgeability Rating (Forging Brass = 100) 40
Hot Working Temperature 1300-1600°F or 700-875°C
Annealing Temperature 900-1300°F or 475-700°C
Machinability Rating (Free Cutting Brass = 100) 30
Suitability for being joined by:  
Soldering Good
Brazing Excellent
Oxyacetylene Welding Good
Gas Shielded Arc Welding Excellent
Coated Metal Arc Welding Fair
Resistance Welding
Spot Excellent
Seam Excellent
Butt Excellent