Stainless 17-4PH Guide | Machining Design Considerations | Penta Precision

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Stainless Steel 17-4 PH Machined Parts

A Guide to 17-4 PH CNC Milled & Turned Parts

What is 17-4 PH?

17-4 PH is a precipitation hardening martensitic stainless steel. It is an American aerospace grade that contains 4% copper. It can be supplied in the annealed condition (condition A - although it should not be used in the annealed condition) or heat treated.

Heat treated conditions:

  • Condition H900 (900°F)
  • Condition H925 (925°F)
  • Condition H1025 (1025°F)
  • Condition H1075 (1075°F)
  • Condition H1100 (1100°F)
  • Condition H1150 (1150°F)

Main Attributes of 17-4 PH:

  • High tensile strength
  • High yield strength
  • Excellent hardness
  • Very high corrosion resistance - on par with the more readily available stainless 304
  • Outstanding wear resistance
  • Good mechanical properties up to 316°C
  • Good welding characteristics

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Similar or obsolete designation and trade names

You may also see 17-4 PH referred to as:

17-4 PH Components, Applications & Industries

Here are some examples of the industries and components for which 17-4 PH is appropriate. This is by no means an exhaustive list. Please do get in touch if you are considering using 17-4 PH and we can talk through your project with you.

Typical Components & Applications:
  • Fasteners
  • Valve parts
  • Spindles
  • Turbine blades
  • Undercarriage components
  • Missile and rocket fittings
  • Springs
  • Screws
  • Bolts
  • Gears
  • Bushes
  • Wear rings
  • Chemical process components
Industry Examples:
  • Aerospace
  • Defence
  • Chemical
  • Petrochemical
  • Food processing
  • Marine
  • Oil and gas

    17-4 PH Machining Service

    Penta Precision provides highly accurate machined parts in 17-4 PH. 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 17-4 PH 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?

    Our 3 unique pillars to delivering exemplary service:

    • 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 17-4 PH 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 17-4 PH machining requirements, here's a list of ways to get in touch with us.

    Can we meet your
    17-4 PH machining needs?
    Call our engineering team on
    +44 (0) 23 9266 8334
    or contact us via our email form

    ''I am very impressed with the quality and finish of the parts. They are now being painted so we will be able to start building next week. Many thanks.'' Andrew - Head Designer

    Tel: +44 (0) 2392 668 334

    Fax: +44 (0) 2392 668 335

    Connect with us:

    Penta Precision Engineering Ltd

    Aspen House

    Airport Service Road

    Portsmouth

    Hampshire

    PO3 5RA

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