Inch Torque Values - Scotts S2348 Technical Manual

INCH TORQUE VALUES

INCH TORQUE VALUES
SAE
Grade
No Marks
and Head
Markings
SAE
Grade
No Marks
and Nut
Markings
Grade 1
a a
Lubricated Dry
Size
Nm lb-ft Nm
1/4 3.8 2.8 4.7
5/16 7.7 5.7 9.8
3/8 13.5 10 17.5 13
7/16 22 16 28
1/2 34 25 42
9/16 48 35.5 60
5/8 67 49 85
3/4 120 88 150
7/8 190 140 240
1 285 210 360
1-1/8 400 300 510
1-1/4 570 420 725
1-3/8 750 550 950
1-1/2 990 730 1250 930
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 fasteners 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.
a
"Lubricated" means coated with a lubricant such as engine oil, or fasteners with phosphate and oil coatings.
"Dry" means plain or zinc plated without any lubrication.
b
Grade 2 applies for hex cap screws (not hex bolts) up to 152 mm (6 in.) long. Grade 1 applies for hex cap screws over
152 mm (6 in.) long, and for all other types of bolts and screws of any length.
2 - 6
b
1 or 2
2
b
Grade 2
a a
Lubricated Dry
lb-ft Nm lb-ft Nm
3.5 6 4.4 7.5
7.2 12 9 15.5 11.5 19.5 14.5 25
22 16 27.5 20
20.5 35 26 44
31 53 39 67
45 76 56 95
63 105 77 135
110 190 140 240
175 190 140 240
265 285 210 360
375 400 300 510
535 570 420 725
700 750 550 950
990 730 1250 930
SPECIFICATIONS & INFORMATION
5.1
5
5
Grade 5, 5.1 or 5.2
a a
Lubricated Dry
lb-ft Nm lb-ft Nm
5.5 9.5 7 12
35 26 44
32.5 56 41 70
49 85 63 110
70 125 92 155
100 170 125 215
175 300 220 380
175 490 360 615
265 730 540 920
375 910 670 1150 850
535 1280 945 1630 1200 2050 1500 2600 1920
700 1700 1250 2140 1580 2700 2000 3400 2500
2250 1650 2850 2100 3600 2650 4550 3350
5.2 8
8.2
8
Grade 8 or 8.2
a a
Lubricated Dry
lb-ft Nm lb-ft Nm
9 13.5 10 17
18.5 28 20.5 35
32.5 49 36 63
52 80 59 100
80 120 88 155
115 175 130 220
160 240 175 305
280 425 315 540
455 690 510 870
680 1030 760 1300 960
1450 1075 1850 1350
lb-ft
12.5
26
46
74
115
165
225
400
640
3/2/00