Tech Bulletins
O-RING and BACK-UP SIZING CHARTS
AS-568 SIZING TABLE
The AS-568 O-ring sizing system was developed by the Society of Automotive Engineers (SAE). It utilizes dash " - " to refer to standardized O-ring sizes. The reference system allows engineers to prototype or test designs in a standardized way.
BACK-UP RING MS28774
Back-up rings provide extrusion resistance and may be used with most elastomeric O-ring seals. This guide follows the Back-Up MS27595 dimensions and will discuss the dash number, Inner Diameter (ID), tolerances, and thicknesses.
BACK-UP RING MS27595
Backup rings provide extrusion resistance and may be used with most elastomeric O-ring seals. This guide follows the Back-Up MS28774 scarf cut dimensions and will discuss the dash number, (ID), tolerances, thicknesses, and gap.
JIS SIZING TABLE
JIS B 2401 is a Japanese Industrial Standard for O-Ring sizes. This standard is categorized into four series based on their application.
Series P = Dynamic sealing ; Series G = Static sealing ; Series V = Vacuum ; Series S = Slim hardware
PARKER 5-DASH SERIES
The following 5-XXX sizes from Parker are O-rings of non-standard dimensions for which Parker tooling was available as of January 1,
2007. For any questions about these non-standard O-rings, contact Gallagher Fluid Seals.
O-RING PROPERTIES
This "elastomer cheat sheet" discusses the properties of the most common types of o-ring elastomers.
Learn about the thermal properties/ranges, advantages and disadvantages, and chemical resistances.
GASKET SIZING CHARTS
ASME B16.21-2016 Nonmetallic Flat Gaskets for Pipe Flanges
RING GASKET TABLE
The ASME B16.21-2016 standard covers types, sizes, materials, dimensions, tolerances, and markings for nonmetallic flat gaskets. These gaskets are dimensionally suitable for use with flanges described in the referenced flange standards.
This US Customary Units Ring Gasket table is available for download by clicking the above image.
FULL FACE GASKET TABLE
The ASME B16.21-2016 standard covers types, sizes, materials, dimensions, tolerances, and markings for nonmetallic flat gaskets. These gaskets are dimensionally suitable for use with flanges described in the referenced flange standards.
This US Customary Units Full Face Gasket table is available for download by clicking the above image.
SURFACE FINISH TECH BULLETINS
Skidded & Skidless Measurement Systems
Contact profilometers utilize a stylus that runs over the surface of an object to allow for measurement of various profile parameters. There are two general types of contact profilometers: Skidded and skidless.
Filtering &
Cut-Off Lengths
The sampling length is usually defined as the cut-off length (λc) of the filter used to differentiate surface irregularity wavelengths as either roughness or waviness data on a measured primary profile.
Ra Advantages and Disadvantages
Ra is the arithmetic average of the absolute values of the profile height deviations from the mean line, recorded within the evaluation length. Ra neutralizes the few outlying points so that the extreme points...