Machining 5251 | Machined 5251 Parts | Penta Precision       +44 (0) 2392 668 334

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5251 Machined Parts

A Guide to 5251 CNC Milled & Turned Parts: Properties, Applications and Design Considerations

What is 5251?

Aluminium 5251 is a medium strength magnesium manganese alloy best known for its good ductility and formability.

It has high corrosion resistance, and as a result is commonly used in marine environments.

5251 is traditionally recognised as a general sheet metal working grade. It is not heat treatable to higher strength.

Main Attributes of 5251:

  • Good surface finish & aesthetic properties
  • High corrosion resistance
  • Very good weldability
  • Good anodising properties
  • Good mechanical properties
  • Medium strength
  • High fatigue strength
  • Low density

5251 Machinability


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

The high strength and extra hardness of aluminium 5251 over pure aluminium gives good machinability. Whilst not quite as good as heated treated alloys, it has reasonable machinability for its intended application.

Similar or obsolete designation and trade names

You may also see 5251 referred to as:

Common tempers:

5251 Components, Applications & Industries

Here are some examples of the industries and components for which aluminium 5251 is appropriate. This is by no means an exhaustive list. Please do get in touch if you are considering using 5251 and we can talk through your project with you.

Typical Components & Applications:
  • Panelling & pressings
  • Containers
  • Marine & aerospace components
  • Appliances
  • Packaging
Industry Examples:
  • Marine
  • Aerospace
  • Architecture
  • Automotive
  • Chemica
  • Pharmaceutical

    5251 Machining Service

    Penta Precision provides highly accurate machined parts in 5251. 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 5251 aluminium 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 5251 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 5251 machining requirements, here's a list of ways to get in touch with us.

    Can we meet your
    5251 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

    Connect with us:

    Penta Precision Engineering Ltd

    Aspen House

    Airport Service Road



    PO3 5RA

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