SECTION 8 LYCOMING OPERATOR’S MANUAL
TABLES O-320 SERIES
INCH FRACTIONS CONVERSIONS
Decimals, Area of Circles and Millimeters
Inch Decimal Area MM Inch Decimal Area MM
Fraction Equiv. Sq. In. Equiv. Fraction Equiv. Sq. In. Equiv.
1/64 .0156 .0002 .397 1/2 .5 .1964 12.700
1/32 .0312 .0008 .794 17/32 .5312 .2217 13.494
3/64 .0469 .0017 1.191 35/64 .5469 .2349 13.891
1/16 .0625 .0031 1.587 9/16 .5625 .2485 14.288
3/32 .0937 .0069 2.381 19/32 .5937 .2769 15.081
7/64 .1094 .0094 2.778 39/64 .6094 .2916 15.478
1/8 .125 .0123 3.175 5/8 .625 .3068 15.875
5/32 .1562 .0192 3.969 21/32 .6562 .3382 16.669
11/64 .1719 .0232 4.366 43/64 .6719 .3545 17.065
3/16 .1875 .0276 4.762 11/16 .6875 .3712 17.462
7/32 .2187 .0376 5.556 23/32 .7187 .4057 18.256
15/64 .2344 .0431 5.593 47/64 .7344 .4235 18.653
1/4 .25 .0491 6.350 3/4 .75 .4418 19.050
9/32 .2812 .0621 7.144 25/32 .7812 .4794 19.844
19/64 .2969 .0692 7.540 51/64 .7969 .4987 20.241
5/16 .3125 .0767 7.937 13/16 .8125 .5185 20.637
11/32 .3437 .0928 8.731 27/32 .8437 .5591 21.431
23/64 .3594 .1014 9.128 55/64 .8594 .5800 21.828
3/8 .375 .1105 9.525 7/8 .875 .6013 22.225
13/32 .4062 .1296 10.319 29/32 .9062 .6450 23.019
27/64 .4219 .1398 10.716 59/64 .9219 .6675 23.416
7/16 .4375 .1503 11.112 15/16 .9375 .6903 23.812
15/32 .4687 .1725 11.906 31/32 .9687 .7371 24.606
31/64 .4844 .1842 12.303 63/64 .9844 .7610 25.003
8-6
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