l-8 GENERALINFORMATIONAND MAINTENANCE
tccsio15
Fig. 24 Various styles of torque wrenches
are usually available at your local automo-
tive supply store
and should be used with caution. Again, the general
rule of “if you are using the right tool for the job, you
should not have to strain to tighten a fastener” ap-
plies here.
Beam Type
# See Figure 26
The beam type torque wrench is one of the most
popular types. It consists of a pointer attached to the
head that runs the length of the flexible beam (shaft)
to a scale located near the handle. As the wrench is
pulled, the beam bends and the pointer indicates the
torque using the scale.
Click (Breakaway) Type
$ See Figure 27
Another popular design of torque wrench IS the
click type. To use the click type wrench you pre-ad-
just it to a torque setting. Once the torque is reached,
the wrench has a reflex signaling feature that causes
a momentary breakaway of the torque wrench body,
sending an impulse to the operator’s hand.
Pivot Head Type
# See Figure 27 and 28
Some torque wrenches (usually of the click type)
may be equipped with a pivot head which can allow it
to be used in areas of limited access. BUT, it must be
used properly. To hold a pivot head wrench, grasp
the handle lightly, and as you pull on the handle, it
should be floated on the pivot point. If the handle
comes in contact with the yoke extension during the
process of pulling, there is a very good chance the
torque readings will be inaccurate because this could
alter the wrench loading point. The design of the han-
dle is usually such as to make it inconvenient to de-
liberately misuse the wrench.
*It should be mentioned that the use of any
U-joint, wobble or extension will have an ef-
fect on the torque readings, no matter what
type of wrench you are using. For the most
accurate readings, install the socket directly
on the wrench driver. If necessary, straight
extensions (which hold a socket directly un-
der the wrench driver) will have the least ef-
fect on the torque reading. Avoid any exten-
sion that alters the length of the wrench from
the handle to the head/driving point (such as
a crow’s foot). U-joint or wobble extensions
can greatly affect the readings; avoid their
use at all times.
U.S. Bolts
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HaaIm Toqw mdmuo TORW
(h&l!&, RA&. m 111 R./U. If410 lm
m TolqW
R.Abs.
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Hm
'I4 - 20 i 0.7 68 8 1.1 10.8 10 1.4 13.5
-28 08 8.1 10 1.4 13.6
%s-18 11 1.5 14.9 17 2.3 23.0 19 2.6 25.8
-24 13 1.8 17.6 19 2.6 25.7
S-16 18 2.5 24.4 31 4.3 42.0 34 4.7 46.0
-24 20 2.75 27.1 35 4.8 47.5
%s-14 28 3.8 37.0 49 8.8 66.4 55 7.6 74.5
-20 30 42 40.7 55 7.6 74.5
'h-13 39 5.4 52.8 75 10.4 101.7 85 11.75 115.2
-20 41 5.7 55.6 85 117 115.2
'h-12 51 7.0 69.2 110 15.2 149.1 120 16.6 162.7
-18 55 7.6 74.5 120 16.6 162.7
H-11 83 11.5 112.5 150 20.7 203.3 167 23.0 226.5
-18 95 13.1 128.8 170 23.5 230.5
s-10 105 14.5 142.3 270 37.3 366.0 280 36.7 379.6
-16 115 15.9 155.9 295 40.8 400.0
VD- 9 160 2.: 216.9 395 54.6 535.5 440 60.9 596.5
-14 175 237.2 435 80.1 589.7
l- 6 iti 32.5 318.6 lE 81.6 799.9 660 91.3 894.8
-14 34.6 338.9 91.3 849.8
Metric Bolts
4.6,4.8 8.8
c
@
w
mm04 iEn% (nnr)
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mu
6x1.0 2-3 2-.4 3-4 3-6 4-.8 5-8
8x 1.25 6-8 .6-l 8-12 9-14 12-1.9 13-19
10X1.25 12-17 1.5-2.3 16-23 20-29 2.7-4.0 27-39
12x125 21-32 2.9-4.4 29-43 35-53 4.8-7.3 47-72
14x 1.5 35-52 4.8-7.1 48-70 57-65 7.8-11.7 77-110
16x 1.5 51-77 7.0-10.6 67-100 90-120 12.4-16.5 130-W
18x 1.5 74-110 10.2-15.1 100-150 130-170 17.9-23.4 MO-230
20x 1.5 llO-140 15.1-19.3 150-190 190-240 26.2-46.9 160-320
22x 1.5 150-190 22.0-26.2 200-260 250-320 34.5-44.1 340-430
24x 1.5 190-240 26.2-48.9 260-320 310-410 42.7-56.5 420-550
lccs1098
:ig. 25 Standard and metric bolt torque specifications based on bolt strengths-WARNING:
Ise only as a guide
1
PIVOTEO HANDLE
BEAU OR MEASURING ELEMENT
Yg. 26 Example of a beam type torque wrench
. tccslo3~
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