Free Engineering Calculators, Plans & Guides for NZ Engineers

Practical calculators, plans, videos and guides designed for NZ engineers. Use these tools to size parts correctly, choose the right hardware and get ideas for real-world projects.

Calculators

    Round Plug and Square Plug Calculator

    Matching Plugs

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    Your Specifications

    Shape:
    Outside Diameter (OD):
    Inside Diameter (ID):
    Wall Thickness:
    Tolerance: ±1 mm on outside size

    How-to Videos

    Free Engineering Plans

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    PDF Guides

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    PDF Inspiration

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