stellar labs 5521 - Torque Data for Fasteners

Page 4 | Stellar
®
5521 Telescopic Crane Owner’s Manual
When using the torque data in the
chart, the following rules should be
observed:
• Bolt manufacturer’s particular
specications 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 specied 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 a󰀨ect the torque values listed above.
• Torque values for socket-head capscrews are the same as for Grade 8 capscrews.
• Do not use these values if a di󰀨erent torque value or tightening procedure is given for a specic
application. Torque values listed are for general use only. Check tightness of fasteners
periodically.
• Sheer 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