Engineered Components - Anchor Bolt and Screw Company
Engineered Components - Anchor Bolt and Screw Company
Engineered Components - Anchor Bolt and Screw Company
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That’s what happens<br />
after the current wheel<br />
nut is tightened.<br />
A common problem encountered by<br />
over the road (OTR) tractor trailers is<br />
the loosening of the lug nuts on<br />
the wheels of both the tractor <strong>and</strong><br />
the trailer. When the M22 steel is<br />
torqued to 500 ft. lbs., 1” of the<br />
stud stretches approximately .005<br />
(5 thous<strong>and</strong>ths)...Not Enough to<br />
Maintain Clamp Load. It is<br />
believed the “relaxation” problem<br />
is much greater with aluminum<br />
wheels.<br />
The New, Patented M22<br />
Disc Spring Wheel Nut is<br />
designed specifically to<br />
help solve this “relaxation”<br />
problem. This exclusive assembly allows<br />
.074 (seventy-four thous<strong>and</strong>ths) <strong>and</strong> as<br />
low as .030 (thirty thous<strong>and</strong>ths) with<br />
the Disc Spring starting at 42,000 lbs.<br />
factoring in .010 (ten thous<strong>and</strong>ths)<br />
“relaxation”, you will still have 40,000<br />
lbs. of clamp load. See chart for further<br />
detail.<br />
Part # F0899000-0182<br />
sometimes<br />
RELAXATION<br />
IS A BAD<br />
word<br />
Nut<br />
Conventional M22 Nut<br />
same as being used<br />
Load (lbs.)<br />
50,000<br />
40,000<br />
30,000<br />
20,000<br />
10,000<br />
0<br />
St<strong>and</strong>ard M22 Nut<br />
Disc Spring<br />
.074<br />
Load Vs. Deflection<br />
Theoretical Vs. Actual<br />
Tightened to flat 500 ft. pounds 42,000 lbs. pressure<br />
0.000 0.015 0.031 0.046 0.061 0.076<br />
0.008 0.023 0.038 0.053 0.069<br />
Theory<br />
Actual<br />
Disc Spring<br />
6150 Chrome Vanadium Heat treated<br />
phosphate oil <strong>and</strong> teflon dip. The Disc Spring<br />
has a crown, arch, (deflection) of .074<br />
Deflection (inch)<br />
visit our web site for a video tour<br />
www.engcomponents.com
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