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Safety Instructions
7. Instructions for Tube Disconnection
① Make sure there is no air pressure inside of the tube, before disconnecting it.
② Push the release-ring of the push-in fitting evenly and deeply enough to
pull out the tube toward oneself. By insufficient pushing of the release-
ring, the tube may not be pulled out or damaged by scratch, and tube
shavings may remain inside of the fitting, which may cause the leakage
later.
8. Instructions for Installing a fitting
① When installing a fitting, use proper tools to tighten a hexagonal-column
or an inner hexagonal socket. When inserting a hex key into the inner
hexagonal socket of the fitting, be careful so that the tool does not
touch lock-claws. The deformation of lock-claws may result in a poor
performance of systems or an escape of the tube.
② Refer to Table 2 which shows the recommended tightening torque. Do
not exceed these limits to tighten a thread. Excessive tightening may
break the thread part or deform the gasket and cause a fluid leakage.
Tightening thread with tightening torque lower than these limits may
cause a loosened thread or a fluid leakage.
③ Adjust the tube direction while tightening thread within these limits,
since some PISCO products are not rotatable after the installation.
● Table 2: Recommended tightening torque / Sealock color / Gasket
materials
Thread type
Metric thread
Taper pipe thread
Unified thread
National pipe
thread taper
※ These values may differ for some products. Refer to each specification as well.
9. Instructions for removing a fitting
① When removing a fitting, use proper tools to loosen a hexagonal-column
or an inner hex bolt.
② Remove the sealant stuck on the mating equipment. The remained
sealant may get into the peripheral equipment and cause malfunctions.
10. Arrange piping avoiding any load on fittings and tubes such as twist,
tensile, moment load, shaking and physical impact. These may cause
damages to fittings, tube deformations, bursting and the escape of tubes.
Thread size
Tightening torque
M3 × 0.5
0.7N·m
M5 × 0.8
1.0 ~ 1.5N·m
M6 × 1
2 ~ 2.7N·m
M3 × 0.5
0.5 ~ 0.6N·m
M5 × 0.8
1 ~ 1.5N·m
M6 × 0.75
0.8 ~ 1N·m
M8 × 0.75
1 ~ 2N·m
R1/8
7 ~ 9N·m
R1/4
12 ~ 14N·m
R3/8
22 ~ 24N·m
R1/2
28 ~ 30N·m
No.10-32UNF
1.0 ~ 1.5N·m
1/16-27NPT
7 ~ 9N·m
1/8-27NPT
7 ~ 9N·m
1/4-18NPT
12 ~ 14N·m
3/8-18NPT
22 ~ 24N·m
1/2-14NPT
28 ~ 30N·m
Sealock color
Gasket materials
SUS304
─
POM
White
─
SUS304、NBR
White
NBR
─
─
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