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This page provides lists of preferred sizes in terms of inches and millimeters. This is useful for selecting stock thicknesses, bolt lengths, and other mechanical dimensions. These lists are adapted from Shigley.

Inches (Fractions)

164 , 132 , 116 , 332 , 18 , 532 , 316 , 14 , 516 , 38 , 716 , 12 , 916 , 58 , 1116 , 34 , 78 , 1, 114 , 112 , 134 , 2, 214 , 212 , 234 , 3, 314 , 312 , 334 , 4, 414 , 412 , 434 , 5, 514 , 512 , 534 , 6, 612 , 7, 712 , 8, 812 , 9, 912 , 10, 1012 , 11, 1112 , 12, 1212 , 13, 1312 , 14, 1412 , 15, 1512 , 16, 1612 , 17, 1712 , 18, 1812 , 19, 1912 , 20

Millimeters

0.05, 0.06, 0.08, 0.10, 0.12, 0.16, 0.20, 0.25, 0.30, 0.40, 0.50, 0.60, 0.70, 0.80, 0.90, 1.0, 1.1, 1.2, 1.4, 1.5, 1.6, 1.8, 2.0, 2.2, 2.5, 2.8, 3.0, 3.5, 4.0, 4.5, 5.0, 5.5, 6.0, 6.5, 7.0, 8.0, 9.0, 10, 11, 12, 14, 16, 18, 20, 22, 25, 28, 30, 32, 35, 40, 45, 50, 60, 80, 100, 120, 140, 160, 180, 200, 250, 300



References

  1. Budynas-Nisbett, "Shigley's Mechanical Engineering Design," 8th Ed.