Is Bronze easy to machine?

Bronze has extremely high machinability, with 642 bronze having the highest of all brass and bronze alloys. It’s known for high strength, ductility, thermal conduction, hardness, low friction properties and corrosion resistance. External CNC machining can be performed at relatively fast speeds, whereas slightly slower speeds are recommended for boring or drilling and very slow speeds for reaming.

What are the best grades of bronze for CNC machining?

Different grades of bronze can be used in many industries. 642 bronze is ductile, resistant to corrosion, fatigue, and galling, and has the highest machinability of all brass and bronze alloys. PB1 Phosphor bronze also has good machining qualities and is free machining, yet very tough.

Are coolants necessary for machining bronze?

When CNC machining bronze it can reach high temperatures when drilling and turning so the use of a coolant is recommended.

CNC Bronze Material | CNC Machining Bronze

At a glance

Processes

CNC Mill
CNC Lathe

Lead Time

As fast as 5 days

Finish Options

Available as-machined, media blasted, or hand-polished

Tolerance

With drawing: as low as +/- 0.005 mm
No drawing: ISO 2768 medium

Price

$$$

Applications

Bearings, bushings, thrust washers

About the Material

932 Bearing Bronze is a high strength alloy with good wear and corrosion resistance due to its tin, iron, and zinc content. It is most commonly used for bearings, bushings, and thrust washers. 932 Bronze is not heat treatable.

954 Bearing Bronze (also known as aluminum bronze) contains at least 10% aluminum, which adds to its strength and weldability. Similar to 932 Bearing Bronze, it is commonly used for bearing and bushings.

544 Bearing Bronze (also known as phosphor bronze) offers excellent fatigue and stress-cracking resistance. The material is best utilized in designs for valves and shafts.

Endurance

Lubricity

Material Properties

932 Bronze

Yield Strength (tensile)

18,000 psi

Elongation at Break

10%

Hardness

Rockwell B34

Density

0.322 lbs / cu. in.

Maximum Temp

500° F

954 Bearing Bronze

Yield Strength (tensile)

29,000 PSI

Elongation at Break

15%

Hardness

Rockwell B85

Density

7.45 g/cm^3
0.27lb / in^3

Maximum Temp

1800°F

544 Bearing Bronze

Yield Strength (tensile)

50,000 PSI

Elongation at Break

15%

Hardness

Rockwell B85

Density

8.89 g/cm^3
0.32lb / in^3

Maximum Temp

1700°F

Material Finish

932 Bronze has a shiny reddish-brown finish (slightly darker than Copper), which will vary slightly based on the specified surface finish. 932 Bronze can be polished or media-blasted to change its cosmetic appearance.