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Dixon Sanitary 2016
800.789.1718
Technical
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Glossary of Terms
#3 finish
Used on stainless steel tubing, only the ID is polished to sanitary standards. The OD is unpolished.
#4 dairy finish
Used on any surface, stainless steel is polished to sanitary standards, with 180 grit abrasives.
#5 finish
Used on stainless steel tubing, only the OD is polished. The ID is unpolished.
#7 finish
Used on stainless steel tubing polished to sanitary standards inside and outside.
3A Symbol
Introduced in 1956, the 3A Symbol is a registered trademark used to identify equipment that meets 3A Sanitary
Standards for design and fabrication. The 3A Symbol on dairy and food equipment serves three important
purposes:
1. assures processors that equipment conforms to sanitary standards
2. provides accepted criteria to equipment manufacturers for sanitary design
3. establishes guidelines for uniform evaluation and compliance by sanitarians
3A Finish
Product surface finish equivalent to 150 grit or better OD, and 180 grit or better ID. A maximum of R
a
32 microinch
(0.8 micron) is indicated.
ABS
(Acrylicnitrile-butadiene-styrene) a thermoplastic resin with an excellent resistance to acids, bases, salts and some
solvents. It is heat resistant to 230°F.
ANSI
American National Standards Institute, Inc.
ASME
American Society of Mechanical Engineers
ASTM
American Society for Testing and Materials
Acme Thread
A flat grooved helical ridge on a nut or bolt. This typically has a 29° included angle. Used on bevel seat and
John Perry fittings
Anneal
Stress relief of stainless steel, a heat treatment to remove the stresses generated in forming and welding operations.
This heat treatment is best done under controlled atmosphere or vacuum to maintain the mill finish. The fittings are
not quenched, as in solution annealing; this would reintroduce residual stresses. Done correctly, parts are processed
to provide minimum residual stresses and full corrosion resistance.
Bevel Seat Ferrules
A set of plain (male) and externally threaded (female) bushings with matching bevel angles that
produce a leak-proof seal when connected with a hex union nut. The threads used are Acme form.
Bright Anneal
Annealing in a protective medium to prevent discoloration of the surface.
Bright Annealed Finish
A silvery satin surface, approximately the mill finish of stainless steel.
Buna
Synthetic rubber, a copolymer of acrylonitrile and butadiene
Burst Pressure
The pressure at which rupture occurs.
Clamp
A device used to join mechanical parts, fittings, ensuring a quick leak-proof connection and enabling easy take down.
Cold Flow
Continued deformation or movement of rubber or PTFE under stress. The new set is not reversible.