O-Rings
Additional Information
There are several different standards to choose from when it comes to O-ring dimensions. The most popular in the United States is the AS568 standard for O-ring sizes and tolerances. Maintained by the Society of Automotive Engineers, this standard allows the user to choose from five different cross-sections with inside diameters ranging from 1/32" to 26". Tube fitting boss seals are included in AS568 as 900 series O-ring sizes, and are intended for use in MS33649 (now superseded by SAE-AS5202) straight thread tube fitings. RT/Dygert also offers a wide array of metric sizes, in both standard and non-standard dimensions. As a subset of the metric sizes offered, we also stock many Japanese Industrial Standard (JIS B2401) sizes. If an O-ring with special size or fluid resistance is required, RT/Dygert can provide custom O-rings, specially made to your demanding requirements.
SIZES
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| AS568A | 326 | |
| Dash No. | ||
| US | Nominal | |
| I.D. | 1.600" ± .015" | 1-5/8 |
| O.D. | .000" | 2 |
| C/S | .210" ± .005" | 3/16 |
| Volume | .197in3 | |
Gland Charts
MATERIALS
Aflas® (AG Fluoropolymers)
Non-Stock Material
Other Designations
TFE/P
Composition
Medium density copolymer of tetrafluoroethylene and propylene
Temperature Range
25 to 450 °F
Description
Aflas® or TFE/P is a member of a new generation of fluoroelastomers compounded especially to provide unique properties for specific applications. The primary uses for Aflas are in parts for oil drilling equipment. Aflas can be crosslinked (cured) using a variety of systems, but generally peroxides are used to provide the best all around environmental resistance. A unique property of TFE/P is, that at very low temperatures (down to -54 °C) it takes on leathery consistency and remains functional, unlike many other rubbers which can often become brittle and shatter at low temperatures.
Information above applies to the generic material. Specific compounds may exhibit different properties.
Physical Properties*
| Excellent | Good | Fair | Poor | |
| Abrasion resistance | • | |||
| Compression Set | • | |||
| Elongation | • | |||
| Flame resistance | • | |||
| Gas permeability | • | |||
| Low temperature flexibility | • | |||
| Tear resistance | • | |||
| Tensile strength | • |
Chemical Resistance*
| Excellent | Good | Fair | Poor | |
| Alipathic hydrocarbons | • | |||
| Aromatic hydrocarbons | • | |||
| Concentrated Bases | • | |||
| Dilute acids and bases | • | |||
| Esters | • | |||
| Ketones | • | |||
| Oxidation | • | |||
| Ozone | • | |||
| Phospate Esters | • | |||
| Radiation | • | |||
| Steam | • | |||
| Weather | • |
*Excellent, good, fair and poor are intended to serve as general guidelines only. Actual testing in the application environment is always recommended.
Information above applies to the generic material. Specific compounds may exhibit different properties.