O-ring questions, answered

Standard sizes are sold in packs. Most listings start at 10 pieces; some large or expensive sizes start higher. Each product page shows the pack sizes, the pack total and the per-piece price before you order.

Yes. Use quick order to paste a list of sizes and add every matched size to the cart in one step. Lines that are not listed are collected into a single request, so you do not have to fill in the form repeatedly.

There is no minimum order value for direct online purchases. Custom and volume orders are quoted individually, and the offer states any minimum quantity or value before you commit.

The price shown is the total for one pack, with the per-piece price beside it. Larger packs usually cost less per piece, and the difference is shown on each pack. Taxes and shipping are calculated at checkout. Bulk pricing is a separate, manual quote based on quantity, specification, material and long-term demand.

Standard, non-custom items can be returned under the Refund Policy. Custom parts are not returnable in principle. If we sent a wrong item or there is a quality defect, we put it right. The Refund Policy has the full conditions.

Measure the inside diameter (ID) and the cross section (CS). For a used ring, measure in several places: wear, compression set and swelling change the dimensions. The measurement guide shows the method, and the size finder matches the two numbers to listed sizes.

AS568 is an inch-based size standard identified by dash numbers such as -214. The first digit groups the cross-section series, but the 0xx group has exceptions in its first entries: in our reference table, dash 001 is 1.02 mm, 002 is 1.27 mm, 003 is 1.52 mm, and 004 onward is 1.78 mm. The 1xx, 2xx, 3xx and 4xx groups are nominally 2.62 mm, 3.53 mm, 5.33 mm and 6.99 mm respectively. Check the size chart for the exact dash number and millimetre value.

Send it as a custom request. Around 21,700 distinct sizes are listed; other sizes are made to order. Include the ID, CS, material, hardness and quantity, or attach a drawing or a photo of the old part.

It is a listed size close to, but not the same as, the size you entered. It is shown for comparison only. A nearby size is not an equivalent; check the difference against your groove, or ask us for a review before substituting.

Start with the medium and the temperature. NBR suits mineral oils, fuels and hydraulic fluids. FKM suits higher temperatures, fuels and many chemicals. EPDM suits water, steam and glycol brake fluid, but not petroleum oils. Silicone handles wide temperature ranges in static seals. FFKM handles aggressive chemicals and high temperatures. Family guidance is a starting point; the compound and your conditions decide.

FKM is the standard family name for fluoroelastomer rubber. Brand names used by other suppliers refer to the same family. We quote by family and by compound, and the datasheet for the supplied compound states its properties.

Tell us what your application requires and we will confirm which documents can be supplied for the chosen compound. We do not claim food-contact or potable-water compliance unless a document covers the specific compound we supply.

70 Shore A is the most common general-purpose hardness. Higher hardness resists extrusion and pressure better; lower hardness seals at lower pressure and conforms more easily. The hardness guide explains the trade-offs and links to each grade we list.

Yes. Sizes that are not listed are made as molded or spliced rings, depending on the size, material and quantity. The custom O-ring configurator takes the size, material, hardness, construction and quantity; we reply with price, minimum quantity and lead time.

It depends on the construction. Spliced rings can be made in small quantities; a molded ring in a new size usually needs a larger run. Custom products that require new tooling or molds may incur a one-time tooling charge. Tooling requirements and fees will be confirmed before the order is finalized, and the quote states the minimum before you commit.

With an existing mold, custom rings usually take 3–7 days. When a new mold is needed, tooling and production take 13 days with standard service or as fast as 7 days with rush service. Timing is confirmed after the specifications and order are approved. Rush fees depend on the part and factory schedule. Shipping transit time is additional.

The flow for custom parts is: confirm requirements, place the custom order, sample confirmation if required, bulk production, shipment. After the requirement is confirmed and the order is placed, a sample confirmation can be arranged during production if the project needs it.

Send the number, a photo or a drawing and we will identify the size and material. We quote by our own part numbers, so the offer is clear about what will be supplied.

Standard orders usually dispatch in 1–2 business days. Orders are checked for specification and quality before shipment. Transit time depends on the destination and the service; rates, transit times and the free-shipping threshold are in the shipping policy. For custom parts requiring a new mold, tooling and production take 13 days standard or as fast as 7 days rush, subject to confirmation and additional rush fees. Shipping transit time is extra.

We ship internationally where the destination is supported at checkout. Taxes and customs handling are shown or confirmed at checkout for the destination. Expedited shipping or priority delivery options may be available upon request. Additional shipping charges will apply based on destination, package size, weight, carrier, service level and required delivery time. Expedited shipping changes transit speed only, not production speed.

Pay securely online with card and the other methods shown at checkout, including for large orders. For business orders an invoice or proforma invoice can be provided and a PO can be accepted. Payment terms for qualified business orders can be discussed based on order size and cooperation requirements.

Where a drawing or datasheet exists for the exact listing, it is linked on the product page. Material-family datasheets are labelled as family documents, not lot certificates. When an order has purchasing, quality or project requirements, we can provide the usual documents for that order: material information, compliance documentation, quality documentation, order or product documentation and inspection-related documents. Special certificates, third-party testing, customer-specified report formats or extra testing are confirmed separately and may cost extra.

No. Standard codes are shown as size references for the nominal dimensions. They are not a certification or an approval of a specific compound. Ask for documents if your application requires them.

The charts are compiled from public size references and checked across systems. They are not an official validation of the standard, and the dimensions are nominal. Where a tolerance is shown it is a reference tolerance; your drawing takes priority.