finger stock



Due to their outstanding material and electrical characteristics, beryllium copper fingers of different shapes and dimensions are used in the following industries: broadcasting, telecommunications, industrial control, measuring and instrumentation, aerospace technology, nuclear physics and data processing. Contact fingers and rings made of beryllium copper are used at all radio and microwave frequencies, for instance as contacts to valves and tuning components as well as for shielding.

Material Properties

The beryllium copper (CuBe2) used for our products is a quality tested quench hardening spring material. It is noteworthy for its yield point, tensile strength and elasticity, good electrical conductivity, high fatigue strength as well as its resistance to abrasion and corrosion. The good thermal conductivity coupled with hardness eliminates sparking. The raw material is non-magnetic and has an excellent temperature performance.

Physical Characteristics

Specific weight: 8,4 g/cm3
Melting point: 900 °C
Coefficient to expansion: (20-200 °C) 17x10-6/°C
Thermal Conductivity: 0,27 cal/cm s °C – 1,13 W/cm °C
Vickers hardness: 350-430 (HV)
Bending resistance: 250-290 N/mm2(108cycles strength)
Modulus of elasticity: 135.000 N/mm2
Modulus of torsion: 47.000 N/mm2
Spring bending limit: 820-950 N/mm2
Electrical conductivity: 12,5-13 m/Ω mm2

Material Options

  • Material: hardened or unhardened
  • Finish: bright finish, silver, gold, zinc, bright tin, tin lead, bright nickel or according to customer specifications.
  • Material in stock: hardened and bright finish


  • As a single finger, contact strip or contact ring
  • Contact strips are carried as stock items
  • Almost all contact strips can be formed by the user into contact rings

Special finger

New shapes and special types available at short notice

Please note

While we believe the information in these pages to be correct and in accordance with DIN or MIL standard, we cannot guarantee electrical specification and we accept no responsibility for any errors or misprints. Details are subject to change without notification.