## Tuesday, 20 September 2011

### Sieves, Gauges and Grits

The commonly used designation for grits has become the gauge This is a confusing measure as it increases in number as the size of the material decreases in size. This is because the number of wires per unit increases with decreasing size and the gauge refers to the number of wires used to sieve the material.

In an attempt to indicate the actual sizes of material refered to by the gauge sizes, I have used part of a standard table of equivalents.

12 gauge is 1.7mm or .0661inch

14 gauge is 1.4mm or .0555inch

16 gauge is 1.18mm or .0469inch

18 gauge is 1mm or .0394inch

20 gauge is .85mm or .0331inch

25 gauge is .71mm or .0278inch

30 gauge is .6mm or .0234inch

35 gauge is .5mm or .0197inch

40 gauge is .425mm or .0165inch

45 gauge is .355mm or .0139inch

50 gauge is .3mm or .0117inch

60 gauge is .25mm or .0098inch

70 gauge is .212mm or .0083inch

80 gauge is .18mm or .007inch

100 gauge is .15mm or .0059inch

120 gauge is .125mm or .0049inch

140 gauge is .106mm or .0041inch

170 gauge is .09mm or .0035inch

200 gauge is .075mm or .00295inch

230 gauge is .063mm or .0025inch

270 gauge is .053mm or .0021inch

325 gauge is .045mm or .0017inch

400 gauge is .038mm or .0015inch

450 gauge is .032mm or .0012inch

500 gauge is .025mm or .001inch

635 gauge is .02mm or .0008inch