PS Magazine - TB 43-PS-429
PS, The Preventative Maintenance Monthly
ISSUE 429
AUGUST 1988
THE BEST WAY TO TORQUE
Make sure the tHreads of the nut and bolt are clean.
Run the nut up by Hand until it begins to tIgHten.
To±que the nut to the specified vaLue in one steady, contInuous motion.
²oosen the fastener with another wrench. (Do not use a torque w±ench to loOsen
any Fstener.) ³oosenIng cLeans the threads of bu´rs and dirt aNd LetS the mating
su´µaces sea¶ and aLign with each other·
Torque to specs.
.±² TORQUE to
SPeCIFi³c
VALu´
•±.
¸ncreased ¹iction because of defºrmed
threads takes mo±e and more of the torqu-
ing ef»rt, meaning you get Less and Less
'
HoLding fºrce.
µ¶· l¸¹sºN
W»¼H
I
2np
½¾
wr¿ÀÁh ÂÃÄ
\I
I
-
aLw±ys
ÅÆÇ
ÈÉÊ
rIGhi bol.
5ËÌÍ!fÎÏÐ
ÑÒÓ
²³eJ´µ
¶NC ·¸¹º»¼
½¾¿quÀ
ÔÕÖ
B×ØÙ
cÁÂÃÄÅtÆÇ
As an exampLe, a certain boLt had a ten¼
sion Load of 13,250 pounds with ½70 lb¾ft ¿
of to´queÀ
Án the sixtH time the nut was
i
ÂnstaLled, the ½70ÃLbÄft of to´que produced
È
\
onLy 7,500 pounds of Load, a Loss of 43.5
i
1
pe±centÀ
¸f your TM calLs Åor a new fÆsÇ
tener, use itÈ Átherwise you ɱe asking fo´
troubLe.
ÊigGiËÌ pÍÎcEdU±Es
ÚÛ
nEw LÎads
Ïave BEEË dÐVEÑÎpEd, bUÒ HavE ËÎÒ YEt
ÓadE tHE ÔMÕ
ÖÎ ×nd ÎuØ ÙÚ tÛE±EÜs an apP±ÎvÝÞ
±iggiËg ßr a Load à± wHiCH tHErEás no
LisÒiâÌ in tHE Ôã, äÎuåH æasç witH tÛE
èéansêo±tation ëcHÎÎL aÒ
ÜÝÞ
ìUsÒisí
vß
COMMANDANT
USa Tr±nsport±tion School
aTTN: aTSP-TdD²T
Ft EustIs, Va 23604³5408
a´TOVON 927· µ570/µ9µ3
or Commerci±l (804) 878¶µ570.
àaá
±
âãä
Phone:
aåæçèçé 693-ê066
(ê4 ëçåäì)
If
yOur uNit Has NOt rEcEIvEd a mEsSagE yOu HavE aN iNtErEst iN²
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