Engineering /
Installation and Torque
Installation
and Torque
With
respect to installation and torque, there
are three important design calculations and they are
as follows:
-
Percent Squeeze – giving standard torque
installation (see Table)
-
Compression/Stretch percent
-
Groove Volume
Since
there are wide ranges of sealing applications, more
calculations may be required. If you are using
standard sealing applications, then the calculations
have already been done: (See tables 2 & 3)
On the
other hand, if the application is unique, then these
calculations will need to be tabulated.
IMPORTANT: Calculations must be as accurate as
possible to avoid an end result of leakage.
NOMINAL
SCREW SIZE |
INSTALLATION
TORQUE (in. – lbs.) |
(#4) |
.112 - 40 UNC – 2A |
(#6) |
.138 - 32 UNC – 2A |
(#8) |
.164 - 32 UNC – 2A |
(#10) |
.190 - 32 UNF – 2A |
(#10) |
.190 - 24 UNC – 2A |
(#1/4) |
.250 - 20 UNC – 2A |
(#5/16) |
.312 – 18 UNC – 2A |
(#3/8) |
.375 – 16 UNC – 2A |
|
5
9
20
23
23
75
142
263 |
NOTE:
THE ABOVE VALUES ARE RECOMMENDED AVERAGE VALUES
ONLY. VARIATIONS IN MATERIAL AND LOCAL CONDITIONS
MAY REQUIRE SIGNIFICANT DEVIATIONS FROM THE
RECOMMENDED VALUES.
Sealing Torque
(Click to Enlarge)
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