Metric Screw Sizes Explained

Metric screws are simply measured and the thickness is given in millimeters. The metric screw equivalent size is approximate, but since we’re heading that way, we need to learn and get used to them! By coincidence, the size of an imperial screw head also roughly equates to the gauge. For example an 8-gauge screw has an 8mm wide head.handy huh?

Many metric bolts denote the use of metric measurements with an "M" at the start of the bolt designation, such as "M9x1.2×15." Metric bolts list.

The size of a metric screw or bolt is specified as diameter, pitch and length, in millimeters (millimeters is abbreviated "mm"). For nuts, size will appear as diameter and pitch. There is an exception though-if pitch isn’t specified, the fastener is coarse threaded.

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For example, a metric screw callout looks something like M12 x 1.75 x 85. If you aren’t able to find the callout, measure the screw yourself. If you have a nut or another fastener with a known size, you could also try securing the screw in it.

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Learn how to order metric screws, bolts & machine screws with our. For lengths longer than specified above, see Depth of Thread Chart.

Imperial Screw Sizes Explained A wood screw is sized by two different numbers. First is the Gauge of the screw which refers to the diameter – the larger the number, the larger the diameter. A number 4 screw is much smaller than a number 12 screw.

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Fastener and Screw / Bolt Design, Formula and Calculations The following table chart defines standard metric external thread size M1.6 to M18 per. ANSI/ASME B1.13M-1995. These thread sizes and classes represent bolts and screws, as well, as other standard external threads. Do not use these values for standard metric internal thread design.

So, a 1/4-20 screw has a 1/4" diameter (.250") with 20 threads per inch. Sometimes the terms "coarse" (or UNC/Unified Coarse Thread) or "fine" (UNF/Unified Fine Thread) are used to describe the thread.