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Alloy 173 Beryllium Copper

Sequoia Brass & Copper sells alloy 173 beryllium copper. Beryllium copper (BeCu), also known as copper beryllium, beryllium bronze and spring copper, is a copper alloy with 0.53% beryllium and sometimes with other alloying elements. Beryllium copper combines high strength with non-magnetic and non-sparking qualities. It has excellent metalworking, forming and machining qualities. It has many specialized applications in tools for hazardous environments, musical instruments, precision measurement devices, bullets, and aerospace. Beryllium-containing alloys create an inhalation hazard during manufacturing due to their toxic properties.

C173 is known as a free-machining beryllium and has excellent capacity for being cold worked. Common fabrication processes for 173 beryllium copper are blanking,, drawing, drilling, forming and bending, and turning. Beryllium copper comes in bar, plate, strip, rod, shapes, tube, and wire.

  • Chemical Composition
  • Fabrication Properties
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  Cu Al Be Co Si Pb
Min/Max Rem .2 1.80 - 2.00 .20 min 0.2 .20 - .6
Nominal 97.7 1.9 0.4
Joining Technique Suitability
Soldering Good
Brazing Good
Oxyacetylene Welding Not Recommended
Gas Shielded Arc Welding Good
Coated Metal Arc Welding Good
Spot Weld Good
Seam Weld Fair
Butt Weld Fair
Capacity for Being Cold Worked Excellent
Capacity for Being Hot Formed Good
Forgeability Rating: 0
Machinability Rating: 50
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Common Fabrication Processes For
173 Beryllium Copper

Blanking, drawing, drilling, forming and bending, tapping, turning

Typical Uses

Contact bridges, electrical switch and relay blades, electric motor components, navigational instruments, clips, electrical connectors, relay parts, switch parts, fuse clips
Washers, screws, bolts, retaining rings, roll pins, lock washers, fasteners
Spline shafts, pump parts, valves, non sparking safety tools, flexible metal hose, bushings, rolling mill parts, springs, pumps, shafts, springs, bellows, welding equipment, diaphragms, bourdon tubing
Firing pins