17-4 PH Machining | 17-4 PH Parts | Penta Precision


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Stainless Steel 17-4 PH Machining

A Guide to 17-4 PH CNC Machined Parts: Properties, Applications and Design Considerations

What is 17-4 PH?17-4 PH Machined Part
Heat Treated Conditions
Main Attributes of 17-4 PH
17-4 PH Machining Service
Reasons to Choose Penta
Components, Applications and Industries
Other Names
Technical Properties
Chemical Composition
Further Reading

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)


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Main Attributes of 17-4 PH:

17-4 PH Machining Service - 17-4 PH Milling & Turning

Penta Precision supplies highly accurate 17-4 PH machined parts throughout the UK. Customers turn to us when they have had quality and delivery issues with their existing suppliers and need a reliable precision machining partner.

We communicate well with customers, we take care with the projects placed with us and we are consistent in our service delivery. See our Proven Process page to find out more about our winning formula.

"Penta Precision provide an excellent service to us. They offer a helpful, professional and friendly service. I would recommend anyone looking for sub-contracting machining use them." Peter - Business Development Manager 

Penta Precision provides the following 17-4 PH machining services: 

Reasons to Choose Penta:

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.

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 Machinability

      Stainless steel 17-4 PH has good machinability in the annealed condition - similar to that of stainless 304. Machining does become more difficult after hardening heat treatment.

      Carbide or high speed steel tools should be used along with standard lubrication.

      Similar or obsolete designation and trade names

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

      Technical Properties

      17-4 PH Stainless Steel Physical Properties

      Physical Properties


      Density 7.75 g/cm³
      Thermal Expansion 10.8 x10^-6 /K
      Modulus of Elasticity 196 GPa
      Thermal Conductivity 18.4 W/m.K
      Electrical Resistivity 0.08 x10^-6 Ω .m
      Bar - Solution Annealed - Up to 100mm Dia / Thickness - Spec: EN 10088-3:2005

      Mechanical Properties


      Tensile Strength 1200 MPa
      Hardness Brinell 360 Max HB
      Bar - at P800 - Up to 100mm Dia / Thickness - Spec: EN 10088-3:2005

      Mechanical Properties


      Proof Stress 520 Min PA
      Tensile Strength 800 to 905 MPa
      Elongation A 18 Min %
      Bar - at P930 - Up to 100mm Dia / Thickness - Spec: EN 10088-3:2005

      Mechanical Properties


      Proof Stress 720 Min PA
      Tensile Strength 930 to 1100 MPa
      Elongation A 16 Min %
      Bar - at P960 - Up to 100mm Dia / Thickness - Spec: EN 10088-3:2005

      Mechanical Properties


      Proof Stress 790 Min PA
      Tensile Strength 960 to 1160 MPa
      Elongation A 12 Min %
      Bar - at P1070 - Up to 100mm Dia / Thickness - Spec: EN 10088-3:2005

      Mechanical Properties


      Proof Stress 1000 Min PA
      Tensile Strength 1070 to 1270 MPa
      Elongation A 10 Min %

      Typical 17-4 PH Stainless Steel Chemical Composition (weight %)

      Weight (%)


      min. 0.00 Bal 0.00 0.00 0.00 0.00 15 3.00 3.00 0.00 0.00
      max. 1.50 Bal 0.07 0.04 0.70 0.03 17 5.00 5.00 0.60 0.45


      Further Reading & Resources

      External links for further reading about 17-4 PH

      Want to know more about Penta?

      Can we meet your
      17-4 PH machining needs?
      Call our engineering team on
      023 9266 8334
      or contact us via our email form

      "I'd just like to say thank you for turning this job around so quickly. We received the goods a day earlier than scheduled and they were of excellent quality. We will use Penta again most definitely." James - Principal Engineer

      Tel: 023 9266 8334

      Fax: 023 9266 8335

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      Penta Precision Engineering Ltd

      Aspen House

      Airport Service Road



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