Alloy M25 (UNS C17300) offers the strength properties of Alloy 25 with the added benefit of being "free machining." Alloy M25 rod and wire contain a small amount of lead to provide an alloy tailored for automatic machining operations. Lead promotes formation of finely divided chips, thus extending cutting tool life.

12' Random Lengths
Condition H (Hardened)

CDA 173 ASTM B196
UNS C17300
Nominal Composition:
Copper: 97.7% Beryllium: 1.9% Lead: 0.4%
Also available in condition A (annealed).
Unit of Measure



N/A Beryllium Copper


N/A Round Rod


N/A A (Annealed) H (Hardened)


N/A Alloy M25


N/A 0.120 inches3.048 mm


N/A 0.0404 lbs/ft0.06012328 kg/m

Weight per 12' Length

N/A 0.485 lbs0.2199475 kg

Nominal Composition

N/A 0.20% Min. Cobalt + Nickel 0.4% Lead 0.6% Max. Cobalt + Nickel + Iron 1.9% Beryllium 97.7% Copper

ASTM Specification

N/A ASTM B196 CDA 173 UNS 17300

Random Lengths

N/A 12 ft

Typical Physical Properties


N/A 0.302 lbs/in³

Elastic Modulus

N/A 19 x 106 psi

Coefficient of Thermal Expansion (70ºF to 400ºF)

N/A 9.7 x 104 in/in/ºF

Thermal Conductivity

N/A 60 Btu/(ºF)

Melting Temperature Range

N/A 1600 to 1800 ºF