Technical Specifications for John Guest Products.

tech specs

Technical Specifications

Tube Tolerances
Super Speedfit ® fittings are offered for tubes with outside
diameters to the following tolerances.

Size (inches) 5/32" - 3/16" 1/4" - 1/2"
Tolerance (inches) +0.001 / – 0.003 +0.001 / – 0.004
Size (mm) 4mm - 5mm 6mm - 22mm
Tolerance (mm) +0.05 / – 0.07 +0.05 / – 0.10

Responsibility of Use
While we warrant our products against defects in manufacture or
materials, it is the responsibility of any user/installer to ensure that
fittings and related products are suitable for their application, that the
installation is carried out correctly, and that the installation is properly

For use with chemicals or other potentially aggressive liquids, please
refer to our Chemical Compatibility Chart or consult our Technical Support Department.
Super Speedfit ® fittings are not to be used with explosive
gasses, petroleum spirits, and other fuels, or for central heating

Collet Covers
Are available as additional security against removal of the tube or to
provide a simple means of color coding. Covers are offered in a range
of six colors.

Food Quality
All the fittings in this brochure are produced with Food and Drug
Administration (FDA) approved materials and are therefore suitable for
food quality applications.
The wetted surfaces of John Guest PI, PM, SI, CI, PP and NC plastic
fittings, PPSV and PISV Valves, and PE Tubing are in compliance with
FDA requirements for direct contact with food as detailed in 21CFR
part 177.2470 for the body and 177.2600 for the O-ring.

Maximum Torque Values for John Guest Plastic
Threaded Fittings:
Do not over-tighten plastic threaded fittings, as this could cause undue
stress and eventual failure. Maximum recommended torque figures are
shown below.

                       1/8"- 1/4"             3/8" - 1/2"            3/4"
Maximum           1.0ftlbs              2.2ft lbs               2.9ft lbs
Torque               1.5Nm                3.0Nm               4.0Nm

John Guest recommends that OEM customers consider replacing
threaded ports with the more modern cartridge system.

It is recommended that all installations are checked prior to use to
determine that a seal has been made.
The maximum torque figures quoted for use with Super Speedfit ®
fittings are dependent on the mating thread conforming to the relevant
U.S., British, or International thread standard.

Maintenance and replacement Intervals
John Guest products generally require little maintenance, but as a
minimum we recommend routine visual inspection. Frequency of visual
inspection will depend on severity of application and risk of failure.If
after visual inspection John Guest products appear damaged, cracked,
charred, heat distorted, or corroded, they should be replaced. Any
product that is or appears to be leaking should also be replaced.
Product life is affected by the severity of the application, the hostility of
the working environment, and contact with aggressive chemicals or
liquids. It is, therefore, important that specific replacement intervals be
considered by specifiers/users/customers based on previous service
life or when failure could result in unacceptable downtime, damage, or
injury risk.

Cleaning and Sanitizing
For Acetal Fittings, we recommend only the use of cleaners and
sanitizing agents that are above pH4 and are low in hypochlorite levels.
Acetal fittings and parts that are cleaned and/or sanitized should be
rinsed immediately with copious amounts of clean, neutral tap water to
remove all traces of the cleaners. Details of which products are made
from acetal are shown in our catalog, but generally, John Guest
products incorporating acetal are designated by the part number
prefixes “PI”, “PM”, “CI”, “CM”, and “RM”. While polypropylene has
different mechanical properties from acetal, John Guest Polypropylene
Fittings and Valves, prefixes “PP” and “PPSV”, offer greater resistance
to aggressive chemicals and can be cleaned by the same process as
Acetal Fittings. Our material suppliers recommend ECOLAB Oasis 133
as a suitable external cleaner for acetal products manufactured by John

The company has a policy of continuous research and product development and
reserves the right to amend without notice the specification and design of all
products illustrated.

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