Grain Systems Bucket Elevtors, Conveyors, Series II Sweeps PNEG-720-G2 - Manual (Page 21)

4. General Product Information
PNEG-720-G2 12" and 16" Series II Sweep 21
Torque values to be used when tightening the bolts on the Series II Sweep
It takes more force to tighten a 3/4"-10 bolt than to tighten a 1/2"-13 bolt because of its larger diameter. It
also takes more force to tighten a Grade 8 bolt than it does to tighten a Grade 5 bolt because of the greater
material strength. A bolt that is waxed or otherwise lubricated requires much less force to tighten. If the
same amount of force is used with a lubricated bolt as with a non-lubricated bolt, the lubricated bolt often
will break.
A Suggested Initial Tightening Torque is listed in the Chart below .
Size
Grade #5 Assembly Torque Grade #8 Assembly Torque
Dry Lubricated Dry Lubricated
1/4"-20 8 ft. lbs. 75 in lbs. 12 ft. lbs. 9 ft. lbs.
1/4"-28 10 ft. lbs. 86 in lbs. 14 ft. lbs. 10 ft. lbs.
5/16"-18 17 ft. lbs. 13 ft. lbs. 25 ft. lbs. 18 ft. lbs.
5/16"-24 19 ft. lbs. 14 ft. lbs. 25 ft. lbs. 20 ft. lbs.
3/8"-16 30 ft. lbs. 23 ft. lbs. 45 ft. lbs. 35 ft. lbs.
3/8"-24 35 ft. lbs. 25 ft. lbs. 50 ft. lbs. 35 ft. lbs.
1/2"-13 75 ft. lbs. 55 ft. lbs. 110 ft. lbs. 80 ft. lbs.
1/2"-20 90 ft. lbs. 65 ft. lbs. 120 ft. lbs. 90 ft. lbs.
5/8"-11 150 ft. lbs. 110 ft. lbs. 220 ft. lbs. 170 ft. lbs.
5/8"-18 180 ft. lbs. 130 ft. lbs. 240 ft. lbs. 180 ft. lbs.
3/4"-10 260 ft. lbs. 200 ft. lbs. 380 ft. lbs. 280 ft. lbs.
3/4"-16 300 ft. lbs. 220 ft. lbs. 420 ft. lbs. 320 ft. lbs.
7/8"-9 320 ft. lbs. 320 ft. lbs. 600 ft. lbs. 460 ft. lbs.
1"-8" 640 ft. lbs. 480 ft. lbs. 900 ft. lbs. 680 ft. lbs.
1-1/8" - 7 800 ft. lbs. 600 ft. lbs. 1280 ft. lbs. 960 ft. lbs.
1-1/4" - 7 1120 ft. lbs. 840 ft. lbs. 1820 ft. lbs. 1360 ft. lbs.
1-3/8" - 6 1460 ft. lbs. 1100 ft. lbs. 2380 ft. lbs. 1780 ft. lbs.
1-1/2" - 6 1910 ft. lbs. 1460 ft. lbs. 3160 ft. lbs. 2360 ft. lbs.
Diameter
Proof
Load
Yield
Strength
Tensile
Strength
Proof
Load
Yield
Strength
Tensile
Strength
1/4 to 3/4 85000 92000 120000 120000 130000 150000
3/4 to 1 1/2 74000 81000 105000
Medium Carbon Stl, Quenched and Tempered Carbon Alloy Stl, Quenched and Tempered
Grade 5 Bolts
Grade 5 bolts are designated by three (3) slash marks on the head.
Grade 8 Bolts
Grade 8 bolts are designated by six (6) slash marks evenly spaced on the head of the bolt.
CAUTION
Under no condition shall any other fasteners be substituted for those supplied
by the manufacturer.