The exact ring size
These AFLAS O rings are the custom-molded .139X12.500A80 reference. The listing specifies an inside diameter of 12.5 inches, or 317.5 mm, and a cross section of 0.139 inch, or 3.53 mm. The material is black AFLAS at 80 durometer.
Keep the decimal point at the beginning of the SKU. It is part of the exact reference and helps distinguish the cross section from the inside diameter. This page does not offer a general size selector or combine the other hardnesses in the material family.
Material family and compound identity
The source's material guide identifies AFLAS as a tetrafluoroethylene and propylene copolymer, also described as FEPM or TFE/P. The trade name and hardness belong together in a product match. A general description such as a black chemical-resistant ring does not identify this exact compound and size.
The guide discusses resistance to several chemical environments, including steam and bases, and also lists limitations. Those are material-selection context rather than approval for an unspecified application. Check the actual fluid, concentration, temperature and service conditions using appropriate compound data before selecting a replacement. The material guide lists aromatic fuels, ketones and chlorinated hydrocarbons among unsuitable environments; resolve actual chemical compatibility before choosing this reference.
Compare AFLAS O rings without assuming equivalence
A ring with the same inside diameter and cross section but a different material is a different product. Likewise, another hardness within the AFLAS family is not automatically interchangeable. Compare the equipment's material callout with the exact 80-durometer reference, as well as checking dimensions.
The listing describes this ring as custom molded. That describes its product type; it does not promise a custom production service or a lead time through Plethara. The availability request remains for this one fixed size and material.
Dimension and quantity checks
Use inside diameter and cross section as separate checks. The inside diameter describes the opening; cross section describes the ring's thickness. Do not use the diameter of the illustration as a measurement, and do not confuse the 12.5-inch inside size with an outside dimension.
One proposed request unit represents one .139X12.500A80 ring. A quantity of two means two rings of this exact reference, not an assortment of sizes. No installation hardware, spare seals or material certification service is represented as included.
Request availability
Enter your name, email and requested number of rings. Review the exact SKU and quantity before the final confirmation. This records buyer interest so availability can be checked; it does not reserve inventory or establish a final price.
Availability, final price and delivery timing will be confirmed before any purchase. No payment is collected, no charge is made and no fulfillment is authorized by the request. If the size or compound does not match the original requirement, resolve the product reference before proceeding to a purchase.
Questions about .139X12.500A80
- Which hardness are these AFLAS O rings?
- The exact reference is 80 durometer. Other hardnesses are separate product specifications.
- Is 12.5 inches the outside diameter?
- No. The listing identifies it as the inside diameter. The cross section is separately listed as 0.139 inch.
- Can the form request a different custom size?
- This page is linked to .139X12.500A80 only. Another size requires a separate verified reference.
- Does the material name guarantee chemical compatibility?
- No. The actual compound and operating conditions need to be checked. A material-family description is not application approval.