Beryllium Copper Products

Beryllium Copper Wire

EU RoHS Directive Conformance Marking

RoHS Ready EU RoHS Directive Conformance Marking

Our beryllium copper alloy products (plate, coil, bar and wire) comply with EU RoHS Directive. We use a voluntary marking which shows conformance to RoHS on our material certificate and in the catalog of products. Conformance has been confirmed with certified internal standards.

* Coverage: our beryllium copper alloy products (plate, coil, bar and wire)

Standard Products


Beryllium Copper Wire

  • 1) High Strength

    Beryllium Copper attains a high tensile strength to a maximum of 1500N/mm2 so is not likely to bend even under pressure.

  • 2) High Electrical Conductivity

    The electrical conductivity of Beryllium Copper is 20 to 60% IACS so can be used as a high current density material.

  • 3) High Fatigue Strength

    Beryllium Copper is known to have high fatigue strength against repeated motion, is reliable, and has extremely long-life.

  • 4) Elevated Temperature Properties

    Beryllium Copper performs excellently at elevated temperatures so can be used in a wide range of temperatures.

  • 5) Good Formability

    Using a solution heat treatment, Beryllium Copper is softened to facilitate complex shaping. After shaping, it can achieve the highest strength with an age-hardening process.

  • 6) Corrosion Resistance

    Beryllium Copper is highly resistant to corrosion, so shows less corrosion under a variety of environmental conditions.


Age hardenable material can be formed into complicated shapes and precipitation hardened afterwards. Among Mill-hardened material, which dose not require heat-treatment after stamping or forming, "Type-B" and "Type-S" have especially well-balanced performance in strength and formability.

Alloy (NGK)Alloy 25Alloy 11
Chemical Composition Be 1.80 - 2.00 0.2 - 0.6%
Ni+Co 0.20%min. 1.4 - 2.2%
Ni+Co+Fe 0.6% -
Cu+Be+Co+Ni 99.5%min. 99.5%min.
Tensile Strength N/mm3 Age Hardenable
O 390 - 540 295 - 450
1/4H 620 - 805 -
3/4H 835 - 1070 490 - 635
After Age Hardening
OT 1100 - 1380 690 - 895
1/4HT 1210 - 1450 -
3/4HT 1300 - 1590 790 - 965
Electrical Conductivity after Age Hardening (%IACS) 22%min. 50%min.

Tensile Strength and Electrical Conductivity

Tensile Strength and Electrical Conductivity


Diameter (mm)Tolerance (mm)
0.1 incl. 0.25 and under ±0.005
0.25 over 0.30 and under ±0.008
0.30 over 0.50 and under ±0.010
0.50 over 1.0 and under ±0.015
1.0 over 2.0 and under ±0.020
2.0 over 3.5 and under ±0.025

* Please contact us regarding special requirement.

Mill-hardened Products

Tensile Strength and Electrical Conductivity


  • Due to a straightening process during manufacturing, Beryllium Copper fine wire requires no further straightening when used.
  • Plated wire, in particular, has excellent solderability.
  • As it is age-hardened during the manufacturing process, Beryllium Copper fine wire is hard enough to avoid deformation under high temperature conditions.


  • Symbol


  • Tensile Strength


  • Diameter Tolerance

    +,- 0.002mm

  • Length Tolerance

    +,- 0.2mm

  • Straightness

    50µm/30mm max.

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