Below is a single, consolidated reference for comparing common metric diameters or lengths (in mm) with their approximate inch equivalents (“in.”) and the closest common fraction typically used by mechanics. If you see a fastener labeled “M6,” that simply refers to 6 mm.

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公制 (mm) = 英制 (inch) X 25.4 , 1英吋=8分=25.4mm。 公制螺紋的標示是以字母M開始，加上螺紋的外直徑，單位為mm，例如：M8就是外徑8 mm的公制螺紋。

Metric Screws! : Metric Conversion - Tools Assortments Screws by Head Style Screw Extractors Non-Metric Screws (Inch) Nuts and Washers Metric Machine Screws Computer ...

This guide provides conversion charts to help you find the correct fastener size. US Screw Size Conversion Chart The following chart converts US screw sizes to their decimal (inch) and metric (millimeter) equivalents, as well as the nearest fractional size.

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. All units in mm. These are the M Profile limiting Dimensionings.

Charts for the allowed range of pitch, major and minor diameters for classes 6H and 6g. The values are calculated from the definitions of ISO 965-1. They have limited use since they …

Metric versus Imperial equivalent screw dimensions. Metric screws and their approximately imperial equivalents: ... Example from the table: M4 x 60 equals approximately to # 8 x 2 1/2

Metric Fastener Reference Charts including DIN and ISO Designations, Common Metric Sizes, Metric vs. Inch Sizes, Fastener Sizes in Inches, Pitch vs. Threads per Inch, Millimeters to Inch Conversion.

Use the Bossard Online Metric - Inch Converter free of charge to convert between metric and inch fasteners, such as bolts, nuts etc. Start calculation now!