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C18700 Leaded copper
C187. Free-machining coppers. High volume screw machine work where free-machining behaviour and conductivity are both needed.
Specification
- UNS
- C18700
- Conductivity
- 96 percent IACS
- Machinability
- 85 (C36000 = 100)
- Specification
- ASTM B301 (free-cutting copper rod, bar, wire and shapes)
- Usual temper
- H04 hard drawn
Published typical values for the alloy, not a promise from any shop. Where these numbers come from.
How it machines
Lead acts as the chip breaker, giving the same free-machining behaviour as C14500 with slightly higher conductivity. Excellent on screw machines and for high volume turned parts.
Watch out. Contains around 1 percent lead. Check RoHS and REACH exposure for your market before specifying it, and expect some buyers to reject it on that basis alone.
Typical parts
- High volume screw machine parts
- Electrical connectors
- Switch components
When not to specify it
Check RoHS and REACH exposure for your market before specifying it. Many buyers reject leaded alloys on policy alone, and it is unsuitable for anything food or potable water related.
Drawing callout
Replace the bracket with the ASTM specification for your product form. The RFQ builder does this for you and adds edge, finish and plating lines.
Leaded copper, UNS C18700, [ASTM spec for your product form], temper H04 hard drawn
Other free-machining coppers
A small addition breaks the chip. Around four times the machinability of pure copper for a few points of conductivity, which is the best trade available in this material family.