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Different screw size standards exist because they were developed to meet specific regional or industry requirements. The US uses the Imperial system while most of the world uses the Metric system.

To measure screw size accurately, use a digital caliper to measure the diameter and length. Refer to conversion charts to find the equivalent sizes if needed.

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The numbers on screws (such as #6, #8, etc.) refer to the diameter of the screw. Higher numbers indicate larger diameters.

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The following chart converts US screw sizes to their decimal (inch) and metric (millimeter) equivalents, as well as the nearest fractional size.

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Yes, you can use a screw size chart for bolts as they follow similar sizing standards. However, ensure to check if the specific application has any special requirements.

Fasteners come in various sizes and measurements, which can be confusing when trying to select the right one for your project. Knowing the decimal equivalent for a US screw size is very helpful, especially when using digital calipers to measure screw sizes or when you need to drill a hole to match a screw size. This guide provides conversion charts to help you find the correct fastener size.