Mechanic's Data
General Conversion Table
Multiply By
To Convert
To
Multiply By
To Convert
To
L E N G T H
A R E A
2.54
Inches
Centimeters
.3937
25.4
Inches
Millimeters
.03937
30.48
Feet
Centimeters
.0328
.304
Feet
Meters
3.28
.914
Yards
Meters
1.094
1.609
Miles
Kilometers
.621
VOLUME
.473
Pints
Liters
2.11
.946
Quarts
Liters
1.06
3.785
Gallons
Liters
.264
.016
Cubic inches
Liters
61.02
16.39
Cubic inches
Cubic cms.
.061
28.3
Cubic feet
Liters
.0353
MASS (Weight)
28.35
Ounces
Grams
.035
.4536
Pounds
Kilograms
2.20
-
To obtain
From
Multiply by
Square inches Square
yds.
FORCE
4.448
Pounds
Newtons
.225
.138
1.36
Ft/lbs.
FUlbs.
Kilogram/meters
Newton-meters
7.23
.737
.112
InVlbs.
Newton-meters
8.844
PRESSURE
.068
6.89
Psi
Psi
Atmospheres
Kilopascals
14.7
.145
OTHER
1.104
.746
1.60
.425
Horsepower (DIN)
Horsepower (SAE)
Mph Mpg
Horsepower (SAE)
Kilowatts (KW)
Km/h Km/1
.9861
1.34 .625
2.35
—
To obtain
Tap Drill Sizes
(
National
ioarse or U.S.S.
ScrawS
TapSfcB
Threads Per Inch
Use Drill
Number
No. 5 . . .
No. 6 . . .
No. 8 ...
......
40 ........
......... 32 ........
......... 32 ........
.39
.36
.29
No. 10 ...
N o . 1 2 . . .
*/4 .
5
/16
......
24 ___
......... 24 ___
......... 20 ___
... .18 ____
.25
.17
. 8
.F
% .
......
16 ........
.
5
/16
7
/16,
% .
9
/16 .
......
14 ........
........ 13 ........
........ 12 ........
.u
.
Z7
/64 .
31
/64
% . ,
% . ,
% . .
......
11 ........
......... 10 ........
......... 9
. . . . .
.
17
/32 .
21
/32 .
"
9
/64
National Coarse or
U.S.S.
Screw A
TapSIzo
Threads Par Inch
Use Drill
Number
1 . .
........
8 .......... . %
1
1
/B
7 _____
. .
ra
/64
1
1
/4
........
7 .........
. . 1
7
/M
V/2
. . 6 .
1"/32
National
FitworSAE.
Screw & Threads Par Inch Use Drill
Tap Size
Number
44 ...
37
40 ...
33
36....
........29
.....
32 .......... 21
National
FlneorSAE.
Screw &
Tap Size
Threads Par Inch
Use Drill
Number
No. 12 . .
.
V4.
6
/16 %
.......
28 .........
.......... 28 .........
.......... 24 ........
.......... 24 ........
.15
. 3
. 1
.0
7
/16
' / 2 .
9
/16
% .
......
20 ..........
........ 20 ..........
........ .18 ..........
........ 18 ...........
.W
. »/6«
.
M
/64
.
37
/64
% .
% .
1'/8.
V / 4 .
1V2.
.......
16 .........
.......... 14 .........
.......... 12 .........
.......... 12 ........
.......... 12 .........
.
11
/16 .
13
/16 .
1
3
/64 .
1
11
/64 .
1
27
/64
Square cms.
Square meters
.155
1.196
.645
.836
Multiply by
From
No. 5 . . . .
No. 6 . . . .
N o . 8 . . . .
N o . 1 0 . . . .