Jeep Wrangler TJ. Manual — part 193
FASTENER IDENTIFICATION
DESCRIPTION
The SAE bolt strength grades range from grade 2
to grade 8. The higher the grade number, the greater
the bolt strength. Identification is determined by the
line marks on the top of each bolt head. The actual
bolt strength grade corresponds to the number of line
marks plus 2. The most commonly used metric bolt
strength classes are 9.8 and 10.9. The metric
strength class identification number is imprinted on
the head of the bolt. The higher the class number,
the greater the bolt strength. Some metric nuts are
imprinted with a single-digit strength class on the
nut face. Refer to the Fastener Identification and
Fastener Strength Charts (Fig. 6).
BOLT MARKINGS AND TORQUES - METRIC
Bolt Markings
8.8/8.9
10.9
12.9
Bolt Dia.
N·m
Ft. Lbs.
N·m
Ft. Lbs.
N·m
Ft. Lbs.
6
12
105*
14
120*
16
12
8
25
250*
32
23
38
28
10
54
40
60
45
74
55
12
95
70
108
80
135
100
14
155
115
175
130
216
160
16
243
180
324
210
324
240
* Inch Lbs.
BOLT MARKINGS AND TORQUES - U. S. CUSTOMARY
Bolt Markings
Grade 5
Grade 8
Bolt Dia.
N·m
Ft. Lbs
N·m
Ft. Lbs
1/4 - 20
10
95*
14
125*
1/4 - 28
10
95*
17
150*
5/16 - 18
22
200*
30
270*
5/16 - 24
26
240*
33
300*
3/8 - 16
40
30
55
40
3/8 - 24
47
35
60
45
7/16 - 14
68
50
88
65
7/16 - 20
74
55
95
70
1/2 - 13
101
75
135
100
1/2 -20
115
85
150
110
9/16 - 12
135
105
182
135
9/16 - 18
155
115
202
150
5/8 - 11
202
150
263
195
5/8 - 18
215
160
284
210
3/4 - 10
230
170
297
220
3/4 - 16
236
175
304
225
7/8 - 14
405
300
540
400
* Inch Lbs.
TJ
INTRODUCTION
5
Fig. 6 FASTENER STRENGTH
6
INTRODUCTION
TJ
FASTENER IDENTIFICATION (Continued)
FASTENER USAGE
DESCRIPTION
DESCRIPTION - FASTENER USAGE
WARNING: USE OF AN INCORRECT FASTENER
MAY RESULT IN COMPONENT DAMAGE OR PER-
SONAL INJURY.
Fasteners and torque specifications references in
this Service Manual are identified in metric and SAE
format.
During any maintenance or repair procedures, it is
important to salvage all fasteners (nuts, bolts, etc.)
for reassembly. If the fastener is not salvageable, a
fastener of equivalent specification must be used.
DESCRIPTION - THREADED HOLE REPAIR
Most stripped threaded holes can be repaired using
a Helicoil
t. Follow the vehicle or Helicoilt recommen-
dations for application and repair procedures.
METRIC SYSTEM
DESCRIPTION
The metric system is based on quantities of one,
ten, one hundred, one thousand and one million.
The following chart will assist in converting metric
units to equivalent English and SAE units, or vise
versa.
CONVERSION FORMULAS AND EQUIVALENT VALUES
MULTIPLY
BY
TO GET
MULTIPLY
BY
TO GET
in-lbs
x 0.11298
= Newton Meters
(N·m)
N·m
x 8.851
= in-lbs
ft-lbs
x 1.3558
= Newton Meters
(N·m)
N·m
x 0.7376
= ft-lbs
Inches Hg (60° F)
x 3.377
= Kilopascals (kPa)
kPa
x 0.2961
= Inches Hg
psi
x 6.895
= Kilopascals (kPa)
kPa
x 0.145
= psi
Inches
x 25.4
= Millimeters (mm)
mm
x 0.03937
= Inches
Feet
x 0.3048
= Meters (M)
M
x 3.281
= Feet
Yards
x 0.9144
= Meters
M
x 1.0936
= Yards
mph
x 1.6093
= Kilometers/Hr.
(Km/h)
Km/h
x 0.6214
= mph
Feet/Sec
x 0.3048
= Meters/Sec (M/S)
M/S
x 3.281
= Feet/Sec
mph
x 0.4470
= Meters/Sec (M/S)
M/S
x 2.237
= mph
Kilometers/Hr. (Km/h)
x 0.27778
= Meters/Sec (M/S)
M/S
x 3.600
Kilometers/Hr. (Km/h)
COMMON METRIC EQUIVALENTS
1 inch = 25 Millimeters
1 Cubic Inch = 16 Cubic Centimeters
1 Foot = 0.3 Meter
1 Cubic Foot = 0.03 Cubic Meter
1 Yard = 0.9 Meter
1 Cubic Yard = 0.8 Cubic Meter
1 Mile = 1.6 Kilometers
Refer to the Metric Conversion Chart to convert
torque values listed in metric Newton- meters (N·m).
Also, use the chart to convert between millimeters
(mm) and inches (in.) (Fig. 7).
TJ
INTRODUCTION
7
Fig. 7 METRIC CONVERSION CHART
8
INTRODUCTION
TJ
METRIC SYSTEM (Continued)
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