Elliott Digger Derrick, Operation & Maintenance Manual, Page: 192 / 376

Bolt Torque EEC-0016 V1.2
Bolt Torque
The torque values for fasteners are listed below. Make sure each fastener is the
correct size and grade prior to torqueing. Always use grade 8 nuts with grade 8
fasteners. Use hardened washers under screw heads and beneath nuts that are
torqued. Make sure threads are clean and free of burrs. Use a calibrated torque wrench
and recalibrate on a regular basis.
NOTE: These values are used when torque value is not specified on engineering
drawings (and Parts Manual).
See engineering drawings (Parts Manual) for rotation bearing bolt torque values.
Grade Grade Grade Grade
UNC 5 8 UNF 5 8
Size TPI ft-lb. ft-lb. Size TPI ft-lb. ft-lb.
1/4 20 8 12 1/4 28 10 14
5/16 18 17 25 5/16 24 19 25
3/8 16 30 45 3/8 24 35 50
7/16 14 50 70 7/16 20 55 80
1/2 13 75 110 1/2 20 90 120
9/16 12 110 150 9/16 18 120 170
5/8 11 150 220 5/8 18 180 240
3/4 10 260 380 3/4 16 300 420
7/8 9 400 600 7/8 14 440 660
1 8 580 900 1 14 640 1000
1 1/8 7 800 1280 1 1/8 12 880 1440
1 1/4 7 1120 1820 1 1/4 12 1240 2000
1 3/8 6 1460 2380 1 3/8 12 1680 2720
1 1/2 6 1940 3160 1 1/2 12 2200 3560
Coarse Threaded Fasteners Fine Threaded Fasteners
Tightening Torque
* Tolerance on Torque /- 10%