172 Beryllium Copper
Chemical Composition
 Copper - Remainder (nominal 98.1%)
 Aluminum - .20 max.
 Beryllium - 1.8 / 2.0
 Cobalt - .20 min.
 Silicon - .20 max.
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 - Good
Capacity for Being Hot Formed - Excellent
Forgeability Rating - 40
Machinability Rating - 20
Typical Uses
  • Electrical - Contact Bridges, Clips, Spring Connectors, Current Carrying, Navigational Instruments, Relay Parts, Belleville Washers, Electrical Switch and Relay Blades, Connectors, Switch Parts, Fuse Clips
  • Fasteners - Bolts, Screws, Roll Pins, Retaining Rings, Lock Washers, Fasteners, Washers
  • Industrial - Flexible Metal Hose, Non Sparking Safety Tools, Shafts, Pump Parts, Rolling Mill Parts, Housings for Instruments, Bearings, Bushings, Valve Seats, Valve Stems, Diaphragms, Bourdon Tubes, Bellows, Wear Plates on Heavy Equipment, Springs, Welding Equipment, Spline Shafts, Valves, Pumps, Springs, Electrochemical
  • Ordnance - Firing Pins
  • Other - Tools

172 Beryllium Copper

Alro stocks C17200, also known as Alloy 25, the most commonly utilized beryllium copper (BeCu) alloy. It is notable for exhibiting the higher strength and hardness compared to commercial copper alloys. 172 Beryllium Copper's strength and hardness is similar to that of steel. Beryllium Copper has extremely high hardness and tensile strength but less electrical conductivity than Class III alloys. C17200 copper's ultimate tensile and Rockwell hardness properties in a peak aged condition are in the 200 ksi range and RC 45 respectively (electrical conductivity 22% IACS minimum). End uses include electrical, fasteners, industrial pumps and bearings, firing pins, and other tools.