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Screws Metric Inches Equivalents Convert Conversions

Reference data and engineering information about screws metric inches equivalents convert conversions for basics applications.

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Overview

Engineering reference data for Screws Metric Inches Equivalents Convert Conversions in basics.

Key Formulas

Ohm's Law

V=IRV = IR

Voltage = Current × Resistance.

Newton's Second Law

F=maF = ma

Force = mass × acceleration.

Conservation of Energy

Ein=Eout+ΔEstoredE_{in} = E_{out} + \Delta E_{stored}

Energy balance.

Variables

SymbolDescriptionUnit
VVVoltageV
IICurrentA
RRResistanceΩ
FFForceN
mmMasskg
aaAccelerationm/s²

Screw Conversion Table

30 rows
Approximate equivalents between common metric (ISO) and imperial (UNC/UNF) machine screws.
Metric Diameter(mm)
Metric Length(mm)
Imperial Nominal Size
Imperial Length(in)
31241/2
32043/4
32541
3.51261/2
3.51665/8
3.52063/4
3.52561
3.53061 1/4
42083/4
42581
43081 1/4
44081 1/2
44581 3/4
45082
46082 1/2
47082 3/4
530101 1/4
540101 1/2
550102
560102 1/2
570102 3/4
580103
590103 1/2
5100104
650122
660122 1/2
670122 3/4
680123
690123 1/2
6100124

Source: engineeringtoolbox.com

Practical Conversion Notes

  • Approximation: These conversions are approximate equivalents. The metric and imperial thread pitches and exact dimensions are not identical.
  • Usage: When a metric screw (e.g., M4) is unavailable, find its row in the table to select the closest imperial screw (#8) and matching length.
  • Reading the Table: An M4 x 60mm screw is approximately equivalent to a #8 x 2 1/2 inch screw. Always verify the specific requirements of your application.

Interactive Charts

US machine screws

References