EN 12166 Grade CuSn5 H08 – Premium CuSn5 Tubes & Springs for Precision Engineering

Material CuSn5, mat. No. CW451K is used in the form of tubes for manometer springs or hose tubes as well as for contact springs and connectors. Basically the same application area as CuSn6 (CW452K). CuSn5 shows slightly higher electrical conductivity at slightly lower strength due to the lower tin-content. For the electrolytically tinned strip the coatings (Sn bright, Sn matt, Sn fuzed, SnPb) are listed by the application (better solderability, better corrosion resistance, reduction of the electrical contact resistance, better appearance) in the DIN EN 14436 : 2004-11 (Table 5)

Properties

General

Property	Temperature	Value
Density	20.0 °C	8.85 g/cm³

Mechanical

Property	Temperature	Value
Elastic modulus	20.0 °C	120 GPa
Hardness, Vickers	20.0 °C	225 [-]
Poisson's ratio	20.0 °C	0.34 [-]
Tensile strength	20.0 °C	850 - 930 MPa
Yield strength Rp0.2	20.0 °C	850 - 920 MPa

Thermal

Property	Temperature	Value	Comment
Coefficient of thermal expansion	23.0 °C	1.5E-5 - 1.9E-5 1/K	Typical for Leaded Phosphor Bronze
Specific heat capacity	20.0 °C	380 J/(kg·K)
Thermal conductivity	20.0 °C	96 W/(m·K)

Electrical

Property	Temperature	Value
Electrical conductivity	20.0 °C	1.00E+7 S/m
Specific Electrical conductivity		17 % IACS

Chemical properties

Property	Value
Iron	0.1 %
Lead	0.02 %
Nickel	0.2 %
Phosphorus	0.01 - 0.4 %
Tin	4.5 - 5.5 %
Zinc	0.2 %

EN 12163 Grade CuCo2Be H230 – High-Performance Low‑Alloy Copper Alloy EN 12166 CuSn5 H04 – Premium Copper‑Tin Alloy for Precision Tubes and Connectors

Metal