Copper 187 – Leaded Copper Round Bar

C18700

Overview

Copper 187 (C18700) is a leaded copper alloy with the highest machinability rating (85) and 85% IACS conductivity.

Chemical Composition

Element	Min	Max
Copper (Cu)	Remainder (~97.8%)	—
Lead (Pb)	0.80%	1.50%

Alloy Designations

UNSC18700

Common NameLeaded Copper

ASTMB301

Mechanical Properties

Tensile Strength (½ Hard)42 ksi (290 MPa)

Yield Strength (½ Hard)36 ksi (248 MPa)

Machinability Rating85

Physical Properties

Density8.94 g/cm³

Electrical Conductivity85% IACS

Thermal Conductivity339 W/m·K

Typical Applications

High-volume screw machine parts
Electrical connectors
Switch components
Soldering tips

Fabrication & Joining

Excellent machinability (85 rating — highest for copper)
Good cold working
Not recommended for hot working
Soldering: Good

Need C187 Copper Round Bar?

Contact our sales engineers for a custom quote on C187 (C18700) copper round bar — tailored dimensions, tempers, and finishing options for your exact specifications.

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