Amity Technology 3200, Operating Manual

Page: 42 / 77

7 - 15
7.8 Torque Chart
Torque values listed are for coarse thread
bolts, in general use only. Do not use these
values if a different torque value or tightening
procedure is listed for a specific application.
Check the tightness of cap screws periodically.
Shear bolts are designed to fail under prede-
termined loads. Always replace shear bolts
with the identical grade.
Fasteners should be replaced with the same or
higher grade. If higher grade fasteners are
used, they should only be tightened to the
strength of the original fastener.
Make sure fastener threads are clean and dry,
and thread engagement is properly started.
This will prevent them from failing when tight-
ened.
Tighten cap screws with a plastic insert or
crimped steel
- type lock nuts to approximately
50% of the torque shown in Table 8. Tighten
toothed or serrated
- type lock nuts to the full
torque value.
Table 7 - 1: Torque Chart
Size (A) Grade 5 Grade 8
Stand
ard
Metric N*m lb - ft N*m lb - ft
1
/
4
” .635 cm 12 9 17 12.5
5
/
16
” .794 cm 25 18 35 26
3
/
8
” .953 cm 44 33 63 46
7
/
16
” 1.11 cm 70 52 100 75
1
/
2
” 1.27 cm 110 80 150 115
9
/
16
” 1.43 cm 155 115 225 160
5
/
8
” 1.59 cm 215 160 300 225
3
/
4
” 1.91 cm 375 280 550 400
7
/
8
” 2.22 cm 625 450 875 650
1” 2.54 cm 925 675 1300 975
1
1
/
8
” 2.86 cm 1150 850 1850 1350
1
1
/
4
” 3.18 cm 1650 1200 2600 1950
1
3
/
8
” 3.49 cm 2150 1550 3400 2550
1
1
/
2
” 3.81 cm 2850 2100 4550 3350
Figure 7 - 19: Bolt Grade Identification