Unified Inch Torque Values - Sabre 1338 Gear Technical Manual

UNIFIED INCH TORQUE VALUES

UNIFIED INCH TORQUE VALUES
SAE
Grade
and Head
Markings
SAE
Grade
and Nut
Markings
Grade 1
Lubricated
Size
Nm lb-ft
1/4 3.8 2.8
5/16 7.7 5.7
3/8 13.5 10
7/16 22 16
1/2 34 25
9/16 48 35.5 60
5/8 67 49
3/4 120 88
7/8 190 140
1 285 210
1-1/8 400 300
1-1/4 570 420
1-3/8 750 550
1-1/2 990 730
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
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b
1 or 2
No Marks
2
No Marks
b
Grade 2
a a
Dry Lubricated
Nm lb-ft Nm lb-ft
4.7 3.5 6 4.4
9.8 7.2 12 9
17.5 13 22 16
28 20.5 35 26
42 31 53 39
45 76 56
85 63 105 77
150 110 190 140
240 175 190 140
360 265 285 210
510 375 400 300
725 535 570 420
950 700 750 550
1250 930 990 730
5
Grade 5, 5.1 or 5.2
a a
Dry Lubricated
Nm lb-ft Nm lb-ft
7.5 5.5 9.5 7
15.5 11.5 19.5 14.5 25
27.5 20 35 26
44 32.5 56 41
67 49 85 63
95 70 125 92
135 100 170 125
240 175 300 220
240 175 490 360
360 265 730 540
510 375 910 670
725 535 1280 945
950 700 1700 1250 2140 1580 2700 2000 3400 2500
1250 930 2250 1650 2850 2100 3600 2650 4550 3350
SPECIFICATIONS & INFORMATION
8
5.1 5.2
5
Grade 8 or 8.2
a a
Dry Lubricated
Nm lb-ft Nm lb-ft
12 9 13.5 10
18.5 28 20.5 35
44 32.5 49 36
70 52 80 59
110 80 120 88
155 115 175 130
215 160 240 175
380 280 425 315
615 455 690 510
920 680 1030 760
1150 850 1450 1075 1850 1350
1630 1200 2050 1500 2600 1920
8.2
8
a a
Dry
Nm lb-ft
17 12.5
26
63 46
100 74
155 115
220 165
305 225
540 400
870 640
1300 960
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