Metric/Inch Comparisons / Southwestern Supply Company
First, when ordering or identifying the dimensions of a metric fastener, all metric fasteners are preceded by the capitalized letter 'M'. Then, similar to how inch series fasteners are identified, the diameter is listed with the thread pitch, length and property class. For example: M12 x 1.5 x 50, 10.9 Hex Cap Screw.
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