Mack E7, Service Manual

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200 SPECIFICATIONS
Page 2-21
Inch Thread vs. Metric Thread
Fastener Combinations
Contributing to Assembly
Weakness
The following inch/metric screw and nut (or
tapped hole) combinations can be fully tightened,
but the resulting assembly will be 25% to 60%
weaker than required. Service failure of the
assembly is probable.
Incompatible Metric vs. Metric
Fastener Systems
Thread mismatch can also result when combining
fasteners from incompatible metric fastener
systems. The resulting faulty thread engagement
typically causes thread stripping and/or assembly
weakness which may lead to service failure.
CONVERSION FACTORS
Inch Screws Metric Nuts
*4-48 M3 x 0.5
5-40 M3.5 x 0.6
6-40 M3.5 x 0.6
*8-36 M4 x 0.7
*10-32 M5 x 0.8
12-24 M6 x 1.0
*1/4-28 M7 x 1.0
3/8-16 M10 x 1.5
7/16-14 M12 x 1.75
1/2-13 M14 x 2
3/4-10 M20 x 2.5
*3/4-16 *M20 x 1.5
7/8-9 M24 x 3
*Fine thread
Inch Nuts Metric Screws
*5-44 M3 x 0.5
*6-40 M3.5 x 0.6
8-32 M4 x 0.7
*8-36 M4 x 0.7
*10-32 M5 x 0.8
12-24 M5 x 0.8
*12-28 M5 x 0.8
*1/2-20 *M12 x 1.25
3/4-10 M18 x 2.5
*3/4-16 *M18 x 1.5
1-8 M24 x 3
*1-12 M24 x 2
*Fine thread
1 inch = 25.4 millimeters
1 mile = 1.61 kilometers
1 pint (U.S. liquid) = .473 liter
1 quart (U.S. liquid) = .946 liter
1 cubic inch = .01639 liter
1 pound-foot = 1.3558 Newton-meters
1 horsepower = .746 kilowatt
1 pound/square inch = 6.895 kilopascals
1 pound/square inch = 27.6 inches of water/2.04 inches of
mercury
degrees Fahrenheit = (1.8 x degrees Celsius) + 32
1 gallon (U.S. liquid) = .83267 imperial gallon
1 millimeter = .03937 inch
1 kilometer = .6214 mile
1 liter = 2.1134 pints (U.S. liquid)
1 liter = 1.0567 quarts (U.S. liquid)
1 liter = 61.024 cubic inches
1 Newton-meter = .7376 pound-foot
1 kilowatt = 1.34 horsepower
1 kilopascal = .145 pound/square inch
degrees Celsius = .556 x (degrees Fahrenheit – 32)
1 imperial gallon = 1.2009 gallons (U.S. liquid)
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5-101.bk Page 21 Friday, March 17, 2006 11:05 AM