Iron valve bolt torque, Bolt tightening sequence – NIBCO Iron Gate Valves User Manual
Page 10
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10
IRON VALVE BOLT TORQUE
Before tightening, make sure all surfaces that the fastener will contact are clean and dry.
The torque tightening table listed below applies to clean, undamaged, non-lubricated threaded
fasteners (lubricated threaded fasteners may require less torque – consult the fastener
manufacturer for more detailed instructions).
When tightening, use the sequence chart below. Tighten in two steps.
1. Tighten fastener using about 1/2 the final torque figure.
2. Final tightening using the full torque figure. ASTM A307 steel only.
Fastener Size
7/16
1/2
9/16
5/8
3/4
7/8
1
1-1/8
1-1/4
1-3/8
1-1/2
Torque in Ft. Lbs.
30
45
66
93
150
202
300
474
659
884
1057
BOLT TIGHTENING SEQUENCE
For any technical enquiries please call NIBCO Technical Services.