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Metric Bolt Conversion

Metric bolt conversion data for industrial bolts/rods, machine screws and small diameter fasteners includes metric to standard bolt conversions. The chart below shows metric bolt conversions and DIN numbers for fasteners.

Diameter/Decimal/Metric
Chart for Small Diameter
Fasteners
 Fastener Conversion
Chart
Gauge or
Diameter
Decimal (in)mm Inch Equivalent
 
UNC
UNFMetric Size–PitchISO
and IFI Rec.
 
No.0000 0.021 .53   1– 64 1– 72 M2x 0.4
No.0000 0.034 .86   3– 48 3– 56 M2.5x 0.45
No.00 0.047 1.19   4– 40 4– 48 M3x .5
No.0 0.060 1.524   6– 32 6– 40 M3.5x .6
No.1 0.073 1.854   8– 32 8– 36 M4x .7
No.2 0.086 2.184   10– 24 10– 32 M5x .8
No.3 0.099 2.515   1/4– 20 1/4– 28 M6x 1
No.4 0.112 2.845   5/16–18 5/16– 24 M8x 1.25
No.5 0.125 3.175   3/8–16 3/8– 24 M10x 1.5
No.6 0.138 3.505   7/16–14 7/16– 20 M12x 1.75
No.8 0.164 4.166   1/2– 13 1/2– 20 M14x 2
No.10 0.190 4.826   5/8– 11 5/8– 18 M18x 2
No.12 0.216 5.484   3/4– 10 3/4– 16 M20x 2.5
        1– 8 1–12 M24x 3
        1–1/4– 7 1–1/8– 12 M30x 3.5
        1–1/2– 6 1–1/4– 12 M36x 4