BOLT TORQUES

Lede couplings and mechanical tees are supplied
complete with factory bolts and nuts. The bolt and nut torque
is primarily a function of the bolt and nut size. The following
table shows guidelines for nut and bolt torque and can be
used when setting the torque on power drivers.
Do not exceed the design torque guidelines by more than
25%, as excessive torque could lead to joint failure. Always
tighten nuts evenly and equally by alternating sides to
prevent the gasket from being pinched and always check to
make sure the coupling keys are fully engaged in the grooves.
The bolt pads on flexible couplings have been designed to
meet metal to metal when properly installed. Bolt pad gaps,
regardless of their size, are not acceptable on flexible
couplings. The listed values in the table 1 are guideline
torque values listed by the coupling size. Please note these
are only guidelines and that the actual torque value may be
less than those listed to achieve a proper assembly. Actual
torques for assembly of flexible couplings are normally as
liƩle as 15-20 N-m (11-15 Lbs-Ō) for the bolt size of M10
(3/8’’) and 30-40 N-m (22 to 30 Lbs-Ō) for the M12 (1/2’’)
bolt size. Do not attempt to add further torque after the
bolt pads make metal to metal contact.
If the bolt pads do not make full metal to metal contact,
increase the torque to the listed guideline in table 1. Do not
exceed the listed torque by more than 25%, as excessive
torque could lead to joint failure. If bolt pad gaps sƟll exist
after bolts and nuts have been tightened to the guideline
torque, then this would indicate a problem in the assembly,
pipe and or groove dimensions.
FLEXIBLE COUPLINGS
Table 1
Flexible Coupling Torque Guidelines
Design Bolt Torques
Table 2
Torque Guidelines for Angle-pad Rigid Couplings
The bolt pads on angle-pad rigid couplings and buƩ-joint
rigid couplings have been designed to meet metal to metal
when properly installed. In assition as the bolts are
tightened the bolt pads will slide against one another
creating a slight off-set. This offset should be equal on each
side and is your visual indication that the coupling has been
installed properly for a rigid connection. Bolt pad gaps,
regardless of their size, are not acceptable on angle-pad
coupling. The listed values in the table 2 are guideline
torque values listed by the coupling size. Please note these
are only guidelines and that the actual torque value may be
less than those listed to achieve a proper assembly.
ANGLE-PAD RIGID COUPLINGS
Do not attempt to add further torque afteer the bolt pads PLAIN-END COUPLINGS
make metal to metal contact.
If the bolt pads do not make full metal to metal contact,
increase the torque to the listed guideline in table 2. Do not
exceed the listed torque by more than 25%, as excessive
torque could lead to joint failure. If bolt pad gaps sƟll exist
after bolts and nuts have been tightened to the guideline
torque, then this would indicate a problem in the assembly,
pipe and or groove dimensions.
IMPORTANT CHECK POINTS
BOLT TORQUES

2 60 - 70
45 - 503 90 - 100
65 - 754 90 - 100
65 - 756 200 - 230
145 - 1708200 - 230
145 - 17010200 - 230
145 - 17012270 - 300
200 - 220Size
inHDP
N=m/Lbs - Ō

160-70
45-50---
---1-1/460-70
45-50---
---1-1/260-70
45-50---
---260-70
45-502-1/260-70
45-503 60-70
45-504 90-100
65-755 90-100
65-756 90-100
65-758200-230(JIS216 270-300)
145-170（JIS216 200-220）10270-300
200-22012270-300
200-220Size
inXGQT1
N-m/Lbs-Ō

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