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Technical Information
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Glossary of Terms
Gripping Finger
The part of the clamp that goes over and behind the stem collar to aid in clamp retention.
Hard Coat
An anodizing process in which the surface hardness of aluminum becomes similar to or greater than that
of case hardened steel.
Internal Expansion
A plug (or bullet) is pulled through a stem or a set of blades (fingers) increase the stem ID to the plug
(IX)
OD or a predetermined setting when using expansion blades (fingers). This forces the stem serrations
into the hose tube and the hose cover into the serrations of the ferrule.
JIC
Joint Industrial Committee
JIC Thread
Typically refers to the threads on hydraulic fittings having 37° conical sealing surfaces.
MSHA
Mine Safety and Health Administration
NSF/ANSI
Drinking Water System Components was published in 1988 to establish minimum requirements for the
Standard 61
control of potential adverse human health effects from products that contact drinking water.
Nipple
The section of the fitting that is inserted into the hose. Also known as the shank of a coupling.
Nominal
A dimensional value assigned for the purpose of convenient designation.
Operating Pressure
The pressure at which system functions, also known as Working Pressure
PSI
Pounds per square inch
PSIG
Pounds per square inch gauge
Perlast
®
Perfluoroelastomer (FFKM) is the most chemically resistant elastomer available and is effectively a
rubber form of PTFE. Perlast
®
perfluoroelastomer grades provide other properties which prove most
valuable in critical sealing applications where purity, high temperatures and retention of sealing force are
paramount.
Permanent Fitting
The type of fitting which, after it is applied, cannot be removed for reuse.
Polymer
A macromolecular material formed by the chemical combination of monomers having the same or
different chemical composition.
Proof Pressure
A specified pressure which exceeds the hose assemblies rated working pressure to indicate its reliability
at normal working pressure. Follow RMA’s testing guidelines for specific pressures and duration’s for
various types of hose.
PTFE
Versatile polymer, polytetrafluoroethylene
RMA
Rubber Manufacturers Association
Reusable Fitting
The type of fitting that is designed to be removed from a hose and recoupled on another hose.
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