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Converts imperial units to metric on McMaster-Carr and toggles tooltips via toolbar button. Metric McMaster automatically converts imperial units to metric as you browse McMaster-Carr product pages. Unlike general converter extensions, Metric McMaster is designed around the formatting and measurement styles used on the McMaster website, helping provide accurate conversions where generic tools may miss values. When you visit mcmaster.com, the extension detects imperial measurements and displays their metric equivalents in tooltips. Hover over a converted value to see its metric conversion, or toggle persistent conversion tooltips with the extension toolbar button or Alt+X. Tooltip rows can also be clicked to copy the raw metric number. This extension is useful for engineers, students, and anyone who prefers metric units when sourcing parts, making it faster to read product specifications without manual calculations or switching tabs.
May 23, 2026
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Media assets
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Has promo video
Whether the listing includes at least one video.
Languages
Declared language locales.
Developer website
Listing exposes a developer website URL.
Contact email
Listing exposes a contact email.
Keyword in name
Case-insensitive substring match in the name.
Keyword in description
Case-insensitive substring match in the description.
Keyword occurrences in description
Count of case-insensitive occurrences in the description.
Category user-count percentile
Share of same-category extensions with fewer users (null if unknown).
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