CZ121 Machined Parts & Properties | ISO 9001:2015 | Penta Precision       +44 (0) 2392 668 334

CZ121 / CW614N Machining, Properties & Components

What is CZ121?

CZ121 (CW614N) is an alpha/beta (duplex) brass alloy containing 37 to 39% zinc. These duplex alloys have restricted ductility being harder and have a higher tensile strength than alpha alloys which contain less than 37% zinc.

CZ121 typically contains 3% lead, giving great high speed, free machining characteristics (machinability rating of 90-100, the highest of any copper alloy).

As a result CZ121/CW614N the European brass grade of choice for many machined components.

Main Attributes of Brass CZ121:

  • Excellent machinability
  • High tensile strength
  • Good corrosion resistance
  • Easily soldered or brazed
  • Good conductivity
  • Good spark resistance
  • Toughness at all temperatures - excellent for hot working (between 630 - 730°C)
  • Low magnetic permeability


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Detailed information about CZ121 for designers including UK stock sizes and technical properties can be found in the tabs below. Please note: this information is provided as a guide only. All information is based on our present knowledge and is given in good faith. No liability will be accepted by Penta Precision in respect of any action taken by any third party in reliance thereon.

Similar or obsolete designation and trade names

You may also see CZ121 referred to as:

CZ121 Components, Applications & Industries

Here are some examples of the industries and components for which CZ121 is appropriate. This is by no means an exhaustive list. Please do get in touch if you are considering using CZ121 and we can talk through your project with you.

Typical Components & Applications:

Used across all industries, CZ121's free machining qualities means it is the copper alloy of vhoice for:

  • Bushes
  • Bearings
  • Pins
  • Hinges
  • Locks
  • Trims
  • Simple and intricate fastenings
  • Architectural extrusions
  • Valves
  • Fittings
  • Manifold blocks
  • Tools
  • Pneumatics & hydraulics
  • Electrical connectors and terminals
  • Appliance parts
  • Watch components
  • Building products
Industry Examples:
  • Electrical
  • Electronics
  • Fluid power
  • Scientific and instrumentation
  • Machinery builders
  • Architecture
  • Plumbing
  • Low level security

    Brass CZ121 Machined Part

    Brass CZ121 CNC Machined Replacement Part

    CZ121 Machining Service

    Penta Precision provides the following brass CZ121 services: 

    Reasons to Choose Penta:

    We are regularly machining CZ121 brass for customers all over the UK. Our customers depend on our machining expertise as well as our outstanding delivery performance, to machine the highest quality parts. Contact us to discuss how we can help you with your CZ121 machining requirements. 

    Can we meet your
    CZ121 machining needs?
    Call our engineering team on
    +44 (0) 23 9266 8334
    or contact us via our email form

    "The quotes and products which Penta have supplied have always met our requirements." David - Test Engineering Manager/ Project Leader

    Tel: +44 (0) 2392 668 334

    Fax: +44 (0) 2392 668 335

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