Maintenance—General
DH10862,00000E3 -19-02JUN09-1/1
Unified Inch Bolt and Cap Screw Torque
Values
UNIFIED INCH BOLT AND CAP SCREW TORQUE VALUES—Tolerance is ±10% unless otherwise specified
T
ORQ1A
—UN—15APR13
Top—SAE Grade and Harvester Head Markings; Bottom—SAE Grade and Nut Markings
The following data is intended to assist in the general maintenance of the carrier. It is recommended
that only grade 8 hardware or better be used.
Grade 1 (No Mark)
Grade 2
a
(No Mark)
Grade 5, 5.1 or 5.2
Grade 8 or 8.2
Thread
Size
Lubricated
b
N·m (lb-ft)
Dry
c
N·m (lb-ft)
Lubricated
b
N·m (lb-ft)
Dry
c
N·m (lb-ft)
Lubricated
b
N·m (lb-ft)
Dry
c
N·m (lb-ft)
Lubri-
cated
b
N·m
(lb-ft)
Dry
c
N·m (lb-ft)
1/4
3.8 (2.8)
4.7 (3.5)
6 (4.4)
7.5 (5.5)
9.5 (7)
12 (9)
13.5 (10)
17 (12.5)
5/16
7.7 (5.7)
9.8 (7.2)
12 (9)
15.5 (11.5)
19.5 (14.5)
25 (18.5)
28 (20.5)
35 (26)
3/8
13.5 (10)
17.5 (13)
22 (16)
27.5 (20)
35 (26)
44 (32.5)
49 (36)
63 (46)
7/16
22 (16)
28 (20.5)
35 (26)
44 (32.5)
56 (41)
70 (52)
80 (59)
100 (74)
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)
a
Grade 2 applies for hex cap screws (not hex bolts) up to 6 in. (152 mm) long. Grade 1 applies for hex cap screws over 6 in. (152 mm) long, and
for all other types of bolts and screws of any length.
b
"Lubricated" means coated with a lubricant such as engine oil, or fasteners with phosphate and oil coatings.
c
"Dry" means plain or zinc plated without any lubrication.
DO NOT use these values if a different torque value or tightening
procedure is given for a specific application. Torque values listed are
for general use only. Check tightness of fasteners periodically.
Shear bolts are designed to fail under predetermined loads. Always
replace shear bolts with identical grade.
Fasteners should be replaced with the same or higher grade. If
higher grade fasteners are used, these should only be tightened to
the strength of the original.
Make sure fastener threads are clean and that you properly start thread
engagement. This will prevent them from failing when tightening.
Tighten plastic insert or crimped steel-type lock nuts to approximately
50 percent of the dry torque shown in the chart, applied to the nut,
not to the bolt head. Tighten toothed or serrated-type lock nuts to the
full torque value.
3-3-3
053122
PN=73
