Machining Stainless 440C | Machined 440C Stainless Steel Parts | Penta Precision       +44 (0) 2392 668 334

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Stainless Steel 440C Machining

A Guide to 440C CNC Machined Parts

What is stainless 440C?

Stainless steel 440C is a martensitic stainless steel and is supplied in round bar. After heat treatment, it’s capable of attaining the highest strength, hardness and wear resistance of all the stainless alloys.

440C is very similar to 440A and 440B but with a higher carbon content and slightly lower corrosion resistance. 440C is also more readily available.

Main Attributes of 440C:

  • Moderate corrosion resistance in mild environments
  • Excellent wear resistance and hardness
  • Good strength
  • Responds well to heat treatment
  • Magnetic in all conditions
  • Not recommended for using in elevated or sub-zero temperatures

Stainless 440C Machinability

Stainless steel 440C is relatively easily machined in the annealed condition. Carbide or ceramic tooling is recommended for use with this alloy.

Machining is extremely difficult once hardened and not recommended.


Need a part machined by an experienced and reliable components manufacturer? Simply complete our short form to receive your no obligation quotation.

Similar or obsolete designation and trade names

You may also see stainless 440C referred to as:

440C Components, Applications & Industries

Here are some examples of the industries and components for which stainless 440C is appropriate. This is by no means an exhaustive list. Please do get in touch if you are considering using 440C and we can talk through your project with you.

Typical Components & Applications:
  • Ball bearings
  • Valve parts
  • Rolling element bearings
  • Surgical instruments
  • Measuring instruments
  • Nozzles
  • Gage blocks
  • Mould inserts
  • Bushings
Industry Examples:
  • Medical
  • Automotive

    440C Machining Service - 440C Milling & Turning

    Penta Precision provides highly accurate 440C machined parts. Customers turn to us when they have had quality and delivery issues with their existing suppliers and need a reliable precision machining partner.

    Penta Precision provides the following 440C machining services: 

    • CNC milling – prototypes & large batch runs
    • CNC turning – prototypes & large batch runs
    • Insert installation
    • Part marking
    • Manual milling
    • Manual turning
    • Machining design advice
    • Machining drawing service

    Reasons to Choose Penta:

    • ISO 9001:2015 quality assurance
    • Consistent high quality machined parts
    • Reliable delivery dates - our track record speaks volumes
    • Exceptional customer service and communication
    • Machining design advice
    • Extensive experience in our field
    What Makes Penta Different?

    There are 3 key elements that run through the core of our company and staff at every level to ensure we deliver an exemplary service that goes above and beyond. We like to call these our 3 C's:

    • We Communicate well 
    • We take Care at each stage
    • Our service is Consistent

    See our ‘Proven Process’ page to find out more

    We are regularly machining 440C 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. If you'd like to discuss how we can help you with your 440C machining requirements, here's a list of ways to get in touch with us.

    Can we meet your
    stainless 440C machining needs?
    Call our engineering team on
    +44 (0) 23 9266 8334
    or contact us via our email form

    "Penta offer a first class service where quality and customer service are paramount" Paul – Storeman

    Tel: +44 (0) 2392 668 334

    Fax: +44 (0) 2392 668 335

    Connect with us:

    Penta Precision Engineering Ltd

    Aspen House

    Airport Service Road



    PO3 5RA

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