Back to Copper Round Bar
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
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