Hardware, Chapter 11 hardware, Identifying bolt grades – Grain Systems Tanks PNEG-805 User Manual
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PNEG-805 36' Diameter 40°/45° NCHT Commercial Hopper Tanks
11. Hardware
Identifying Bolt Grades
NOTE: Bolts should not be tightened in excess of the torque specifications.
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
CAUTION
Under no condition shall any other bolts be substituted for those supplied by
the manufacturer.
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 8.2 Bolts
4. Grade 8.2 bolts are designated by six (6) slash marks on the head in a sunrise pattern.
All 3/8" diameter bolts are to be grade 8 or grade 8.2.