2017.03.31

Borrowing a bit from our friends at Bolt Depot, their chart showing US Machine Screw Diameters is helpful, but often I’m designing with Metric units (or a unit-less system that outputs in millimeters) and I need to convert Imperial units to mm. (I tend to do a lot of work using OpenSCAD and Inkscape for 3D printing.)

The chart below allows me to specify screws and bolts and then design holes that will work. For instance, I used a lot of #4 screws, and the chart tells me I need a hole diameter of approximately 2.794mm. Handy!

Size Thread Diameter
Decimal Nearest Fractional Metric
#0 0.06″ 1/16″ 1.524mm
#1 0.07″ 5/64″ 1.778mm
#2 0.08″ 3/32″ 2.032mm
#3 0.09″ 7/64″ 2.286mm
#4 0.11″ 7/64″ 2.794mm
#5 0.12″ 1/8″ 3.048mm
#6 0.13″ 9/64″ 3.302mm
#8 0.16″ 5/32″ 4.046mm
#10 0.19″ 3/16″ 4.826mm
#12 0.21″ 7/32″ 5.334mm
#14 0.24″ 1/4″ 6.096mm

See Also: Millimeters, Inches, Fraction, Decimals

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