Heavy Haul Trailers
64
6.1.1
Unified Inch Bolt and Screw Torque Values
TABLE 6-1.
Unified Inch Bolt and Screw Torque Values
Bolt or
Screw
Size
SAE Grade 1
SAE Grade 2
a
SAE Grade 5, 5.1 or 5.2
SAE Grade 8 or 8.2
Lubricated
b
Dry
c
Lubricated
b
Dry
c
Lubricated
b
Dry
c
Lubricated
b
Dry
c
N.m lb-in N.m lb-in N.m lb-in N.m lb-in N.m lb-in N.m lb-in N.m lb-in N.m lb-in
1/4
3.7
33
4.7
42
6
53
7.5
66
9.5
84
12
106
13.5
120
17
150
N.m
lb-ft
N.m
lb-ft
5/16
7.7
68
9.8
86
12
106
15.5
137
19.5
172
25
221
28
20.5
35
26
N.m
lb-ft
N.m
lb-ft
3/8 13.5
120
17.5
155
22
194
27
240
35
26
44
32.5
49
36
63
46
N.m
lb-ft
N.m
lb-ft
N.m
lb-ft
7/16
22
194
28
20.5
35
26
44
32.5
56
41
70
52
80
59
100
74
N.m
lb-ft
1/2
34
25
42
31
53
39
67
49
85
63
110
80
120
88
155
115
9/16
48
35.5
60
45
76
56
95
70
125
92
155
115
175
130
220
165
5/8
67
49
85
63
105
77
135
100
170
125
215
160
240
175
305
225
3/4 120
88
150
110
190
140
240
175
300
220
380
280
425
315
540
400
7/8 190
140
240
175
190
140
240
175
490
360
615
455
690
510
870
640
1 285
210
360
265
285
210
360
265
730
540
920
680
1030
760
1300
960
1-1/8 400
300
510
375
400
300
510
375
910
670
1150
850
1450 1075 1850 1350
1-1/4 570
420
725
535
570
420
725
535
1280
945
1630 1200 2050 1500 2600 1920
1-3/8 750
550
950
700
750
550
950
700
1700 1250 2140 1580 2700 2000 3400 2500
1-1/2 990
730
1250
930
990
730
1250
930
2250 1650 2850 2100 3600 2650 4550 3350
Torque values listed are for general use only, based on the strength of the bolt or
screw. DO NOT use these values if a different torque value or tightening procedure
is given for a specific application. For plastic insert or crimped steel type lock nuts,
for stainless steel fasteners, or for nuts on U-bolts, see the tightening instructions
for the specific application. Shear bolts are designed to fail under predetermined
loads. Always replace shear bolts with identical grade.
Replace fasteners with the same or higher grade. If higher grade
fasteners are used, tighten these to the strength of the original.
Make sure fastener threads are clean and that you properly start
thread engagement. When possible, lubricate plain or zinc plated
fasteners other than lock nuts, wheel bolts or wheel nuts, unless
different instructions are given for the specific application.
a
Grade 2 applies for hex cap screws (not hex bolts) up to 6 in. (152mm) long. Grade 1 applies for hex cap screws over 6 in. (152mm) long and for all
other types of bolts and screws of any length.
b
Lubricated means coated with a lubricant such as engine oil, fasteners with phosphate and oil coatings, or 7/8 in. and larger fasteners with JDM F13C
zinc flake coating.
c
Dry means plain or zinc plated without any lubrication, or 1/4 to 3/4 in. fasteners with JDM F13B zinc flake coating.
Summary of Contents for H550 Series
Page 2: ......
Page 4: ...Heavy Haul Trailers ...
Page 15: ...Heavy Haul Trailers 8 ...
Page 30: ...21 Heavy Haul Trailers ...
Page 31: ...Heavy Haul Trailers 22 Both Sides ...
Page 32: ...23 Heavy Haul Trailers Both Sides ...
Page 52: ...43 Heavy Haul Trailers 3 5 4 Extension Load Shim Instructions ...
Page 59: ...Heavy Haul Trailers 50 ...
Page 84: ...69 Heavy Haul Trailers Date Maintenance Performed Maintenance Records ...
Page 85: ...Heavy Haul Trailers 70 Date Maintenance Performed Maintenance Records ...
Page 86: ...71 Heavy Haul Trailers Date Maintenance Performed Maintenance Records ...
Page 87: ...Heavy Haul Trailers 72 Date Maintenance Performed Maintenance Records ...
Page 88: ......