About Smiths

We are a world-class supplier of engineering raw materials. Our objective is to provide all our customers, from the small machine shop to the large multi-national corporation, a supply path that continuously delivers the highest levels of service, quality and value.

CZ121 (CW614N)

Brass Alloy

CZ121 Brass Alloy

CZ121 offers the highest possible machinability of any copper alloy.


This alloy is a free-machining brass with a 3% lead content - the addition of lead is finely dispersed throughout the microstructure of the material which acts as both a lubricant and chip breaker; this results in giving the alloy its free machining characteristics. With a machinability rating of 100%, CZ121 is the standard by which all other copper-based alloys are rated. The alloy also offers good corrosion resistance and strength.


CZ121 offers good corrosion resistance and good strength. The alloy promotes excellent hot formability with the highest machinability of any copper alloy.

Typical Applications

Commercial applications for this engineering material include:

  • All types of machined components
  • Fasteners
  • Extruded sections
  • Window frames
  • Plug pins
  • Switch blocks

We stock CZ121 in flats, round bar, round tube, hollow bar, square bar, hexagon bar, angles, channels, tee sections and hollow hexagon bar.

Technical Assistance

Our knowledgeable staff and resident metallurgists will be pleased to assist you further on any technical topic. Smiths Metal Centres Limited also boasts an in-house UKAS Accredited Testing Laboratory which is unique within the multi-metal and plastic stockholding sector. We believe this underlines our total commitment to quality and our ethos of being the complete service provider.

Additional Info

A technical datasheet for CZ121 is available in PDF file format. To view and download, please click here.

We offer in-house processing options - for more information, please refer to our processing services.

Read our corporate brochure by clicking here.

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