Grain Systems Tanks PNEG-972 - Manual (Page 19)

PNEG-972 Construction Manual for 2.66" Corrugation 105' Diameter Tall Tanks (28 Rings and Taller) 19
7. Bolting and Hardware Requirements
Hardware
Identifying Bolt Grades
IMPORTANT: Bolts should not be tightened in excess of the torque specifications listed below .
Hardware usage is detailed in the bolting requirement charts on Page 18 , stiffener and splice
hardware charts on Pages 34 and 54 and the bolting and the hardware requirements section above .
Torque (ft. lbs.)
Bolt Size Minimum Maximum
5/16"-18 15 20
3/8"-16 35 42
7/16"-14 65 72
1/2"-13 95 105
Grade 2 Bolts
1. Grade 2 bolts are designated with a plain head and are not used in
GSI grain bins/silos.
Grade 5 Bolts
2. Grade 5 bolts are designated by three (3) slash marks on the head.
All 5/16" diameter bolts are to be grade 5 or higher.
Grade 8 Bolts
3. Grade 8 bolts are designated by six (6) slash marks evenly spaced out
around the head of the bolt.
Grade 2 Bolts
4. Grade 8.2 bolts are designated by six (6) slash marks on the head in a sunrise
pattern. All 3/8" and 7/16" diameter bolts are to be grade 8 or 8.2.
Under no condition shall any other bolts be substituted for those supplied by
the manufacturer.
CAUTION