Grain Systems Tanks PNEG-603 - Manual (Page 28)

28 PNEG-603 4" Commercial Hopper Tank
7. Hardware
Identifying Bolt Grades
NOTE: Do not tighten bolts to exceed the torque specifications listed in the below chart.
IMPORTANT: Hardware usage - 20 Gauge - 14 Gauge sidewall sheets,
use 5/16" x 3/4" bolts and nuts (S-275).
13 Gauge sidewall sheets,
use 3/8" x 1" bolts and nuts (S-455).
Bolt Size
Torque (Ft. Lbs.)
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. Grade 2 bolts will not be used in a
GSI grain Bin.
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 8.2.