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C187

# 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

UNS C18700 

Common Name Leaded Copper 

ASTM B301 

### Mechanical Properties

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

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

Machinability Rating 85 

### Physical Properties

Density 8.94 g/cm³ 

Electrical Conductivity 85% IACS 

Thermal Conductivity 339 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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