420 Machining | 420 Machined Parts | Penta Precision

sales@pentaprecision.co.uk       +44 (0) 23 9266 8334

Stainless Steel 420 Machining

A Guide to 420 CNC Machined Parts

What is stainless 420?Stainless steel turned part

Stainless 420 is a general purpose high carbon martensitic steel. It is usually supplied hardened and tempered or annealed condition. Martensitic stainless steels are designed for high hardness and sometimes other properties are compromised on. 

420 has the highest hardness amongst all stainless grades with 12% chromium. The addition of sulphur to improve machinability does lower the corrosion resistance and weldability to below that of grade 410 (non-free machining equivalent).

Main Attributes of 420:

  • Rust resistant
  • High hardness
  • Exceptional wear resistance
  • Good corrosion resistance achieved when hardened and surface ground or polished (to atmosphere, foods, fresh waters, mild acids)
  • Magnetic
  • Although it can be used in continuous service up to 650°C, this can result in a considerable drop in its core properties (hardness, tensile strength, corrosion resistance), therefore not recommended for use at working temperatures above 400°C

Get 420 Machining Quote

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

420 Machining Service - 420 Milling & Turning

Penta Precision supplies highly accurate 420 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.

Penta Precision provides the following 420 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 420 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 420 machining requirements, here's a list of ways to get in touch with us.

Want to know more about Penta?

Can we meet your
stainless 420 machining needs?
Call our engineering team on
+44 (0) 23 9266 8334
or contact us via our email form

"It has been a pleasure to work with Penta Precision with clear, concise and accurate communication and products exactly meeting our specification."Anthony - Quality Manager

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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