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TECHNICAL DATA
Torque Specifications
Engine crankshaft bolt
Deck pulley bolts
Lug nuts
Spark plug torque
Blade bolt
The torque values shown should be used as a general guideline
U.S. Standard Hardware
Grade
Size
1/4
5/16
3/8
7/16
1/2
9/16
5/8
3/4
7/8
1-1/8
** Grade 5 - Minimum commercial quality (lower quality not recommended)
Metric Standard Hardware
Grade
Size
M4
M5
M6
M7
M8
M10
M12
M14
M16
M18
M20
M22
M24
M27
34
50 ft/lb
150 ft/lb
75 ft/lb
15 ft/lb (20 Nm)
90 ft/lb
HEX HEAD CAP SCREWS
when specific torque values are not given.
SAE Grade 5
ft./lbs
Nm
9
12
18
24
31
42
50
68
75
102
110
149
150
203
250
339
378
512
782
1060
Grade 8.8
ft./lbs
Nm
1.5
2
3
4
5.2
7
8.2
11
13.5
18
24
33
43.5
59
70.5
96
108
146
142
193
195
264
276
374
353
478
530
719
Standard 1/4" fasteners
Standard 5/16" fasteners
Standard 3/8" fasteners
Standard 7/16" fasteners
Standard 1/2" fasteners
SAE Grade 8
ft./lbs
Nm
13
18
28
38
46
62
75
102
115
156
165
224
225
305
370
502
591
801
1410
1912
Grade 10.9
ft./lbs
Nm
2.2
3
4.5
6
7.5
10
12
16
18.8
25
35.2
48
62.2
84
100
136
147
199
202
274
275
373
390
529
498
675
735
996
9 ft/lb
18 ft/lb
33 ft/lb
52 ft/lb
80 ft/lb
Flangelock Screw
w/Flangelock Nut
ft./lbs
Nm
24
33
40
54
Grade 12.9
ft./lbs
Nm
2.7
3.7
5.2
7
8.2
11
15
20
21.8
30
43.5
59
75
102
119
161
176
239
242
328
330
447
471
639
596
808
904
1226
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