Stellar
®
7630 Telescopic Crane Owner’s Manual PN: 106864| Page 9
When using the torque data in the chart, the following rules should be observed:
• Bolt manufacturer’s particular specications should be consulted when provided.
• Flat washers of equal strength must be used.
• All torque measurements are given in foot-pounds. To convert to inch-pounds, multiply by 12.
• Torque values specied are for bolts with residual oils or no special lubricants applied. If special
lubricants of high stress ability, such as Never-Seez compound graphite and oil, molybdenum
disulphite, colloidal copper or white lead are applied, multiply the torque values in the charts by the
factor .90. The use of Loctite does not aect the torque values listed in the table.
• Torque values for socket-head capscrews are the same as for Grade 8 capscrews.
• Do not use these values if a dierent torque value or tightening procedure is given for a specic
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.
• Tighten plastic insert or crimped steel-type lock nuts to approximately 110 percent of the dry torque
values shown in the chart below, applied to the nut, not to the bolt head. Tighten toothed or serrated-
type lock nuts to the full torque value. Note: “Lubricated” means coated with a lubricant such
as engine oil, or fasteners with phosphate and oil coatings. “Dry” means plain or zinc plated
without lubrication. Tighten lubricated bolts to approximately 80% of dry bolts.
Size Bolt DIA Plain Plated Plain Plated Plated
(DIA-TPI) (Inches) (Ft-Lb) (Ft-Lb) (Ft-Lb) (Ft-Lb) (Ft-Lb)
5/16-18 0.3125 17 13 25 18 22
3/8-16 0.3750 31 23 44 33 39
7/16-14 0.4375 49 37 70 52 63
1/2-13 0.5000 75 57 105 80 96
9/16-12 0.5625 110 82 155 115 139
5/8-11 0.6250 150 115 220 160 192
3/4-10 0.7500 265 200 375 280 340
7/8-9 0.8750 395 295 605 455 549
1-8 1.000 590 445 910 680 823
1 1/8-7 1.1250 795 595 1290 965 1167
1 1/4-7 1.2500 1120 840 1815 1360 1646
1 3/8-6 1.3750 1470 1100 2380 1780 2158
1 1/2-6 1.500 1950 1460 3160 2370 2865
GRADE 5 GRADE 8 GRADE 9
Torque Data Chart
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