The Wonderful World of Metric Washers

Metric fasteners seem simple enough until it’s time for you to actually select the exact kind that you need. There are actually a wide variety of types, styles and grades to choose from. This is not only true of metric bolts or metric screws – it also applies when you’re looking for the right metric washer for the job. Flat washers, curved washers, split washers, internal and external washers – what’s the difference?

Let’s take a look at the various categories offered by Mr. Metric. Our best seller is the good old flat washer, a thin, flat metal sphere with a large hole cut in its center. This versatile washer provides plenty of tension between the head of a screw or nut and the substrate for general-purpose applications. Curved washers and wave washers exert a lighter thrust load than flat washers and are used in rotating mechanisms such as bearings, motors and seals.

Metric Flat WashersMetric Curved WashersMetric Wave Washers

A split washer resembles a flat washer when viewed from the top, except for the obvious split in one section of the metal, but a side view reveals a slight coil in its design. This extra bearing surface distributes force loads more evenly for better tension control. A thicker variation called a Hi-Collar washer is a great alternative if you’re using smaller-headed screws.

Metric Split Lock WasherMetric Lock Hi-Collar Washer






We also carry two kinds of “tooth-lock” washers. External washers have a row of teeth along their outer edge that bite into the substrate for a superior grip. Internal washers have teeth on the inside of the washer hole – they don’t lock quite as effectively as external washers, but they look nicer in circumstances where cosmetic appeal comes first.

Metric External WashersMetric Internal Washers

See all of the washers Mr. Metric has in stock at the online store.

Contact us and let us help you select the perfect washer for your needs!

About the author

Mr. Metric is the spokesperson for, an online store for metric fasteners. Get $7.50 flat shipping with no minimum orders, plus advice and best practices for using metric fasteners in any application.

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