US (Inch) Screw Sizes with Decimal and Metric equivalents
101.6 mm. 1-1/4". 31.75 mm. It is very helpful to know the decimal equivalent for a US screw size you have. That is often found when trying to match a screw size using Digital Calipers (Inch Decimal to Screw Size) or drill a hole (Screw size to Nearest Fraction) for your project. The second chart below is a US fraction to metric mm for the more c.
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