Gauge Fit Guide
GAUGE FIT CHART |
|||||
A |
B |
C |
D |
E |
Price |
Our electronic caliper (ECM) measurement |
Our ECM in hundredths of an inch |
Nearest (NE) equivalent in inch fractions |
NE in hundredths of an inch |
Difference between ECM and NE in mm |
|
10mm |
.34 |
3/8 |
.38” |
.04” |
$10.95 |
12mm |
.47” |
1/2 |
.50” |
.03” |
$12.95 |
14mm |
.55” |
9/16 |
.56” |
.01” |
$15.95 |
16mm |
.63” |
5/8 |
.63” |
.00” |
$17.95 |
18mm |
.71” |
11/16 |
.69” |
.02” |
$19.95 |
20mm |
.79” |
13/16 |
.81” |
.02” |
$21.95 |
22mm |
.87” |
7/8 |
.86” |
.01 |
$23.95 |
24mm |
.95” |
15/16 |
.94” |
.01” |
$25.95 |
Relevant abbreviations and calculations
Mm = millimeters.
There are 25.4 millimeters in an inch.
Column A: The actual measurement of the smallest diameter of this double flare gauge.
Column B: Column A measurement in inches (calculated by dividing measurement A by 25.4 mm per inch.) Example: 12 mm/25.4mm per inch yields .47 inches)
Column C: Column B measurement rounded to a fraction
Column D: What column C fraction would be in hundredths of an inch (calculated by top number of column C divided by bottom number of column C) Example: for the 12 mm row, 1 divided by two is .5 or .50 inches.
Column E: The difference between column B and column D.
How to use this chart:
Q: I am currently wearing ⅞” gauges. How different would the fit of 22 mm gauges be?
A: ⅞ ince is about .86mm, and 22mm gauges are about .87”diameter. Looking in column E, you’ll see that the difference between ⅞”gauges and 22mm gauges is 0.01” or one one-hundreth of an inch. For most people, a difference of several hundredths of a mm is not noticeable.