Custom Flat O-Rings Cut to Size — Instant Quote

Flat O-Rings and Ring Gaskets Cut to Size

Set your outside diameter, inside diameter and thickness, choose a material, and the price appears as you type. Cut to your exact numbers, no minimum order, ships in one business day.

Flat rings, not molded O-rings

We cut flat rings from sheet material — a rectangular cross-section, like a washer or a ring gasket. We do not make molded O-rings with a round cross-section (the AS568 dash-number type that sits in a machined groove).

If your seal sits in a groove and rolls, you need a molded O-ring and we are not the right supplier. If your seal sits flat between two faces — a flange, a cap, a housing, a lid, a fitting — a flat cut ring is what you want, and it is often the better part: it seals a larger area and does not need a groove machined for it.

What we cut these for

• Flange and pipe joints where a flat face seals against another flat face
• Filter housings, pump covers and inspection caps
• Replacements for a discontinued ring where you have the old part or the dimensions
• Spacer and shim rings where thickness matters more than sealing

Materials

• Silicone — widest temperature range.
• EPDM — water, steam and outdoor exposure.
• Buna-N (nitrile) — fuel, oil and hydraulic fluid.
• Viton — aggressive chemicals and sustained heat.
• Neoprene — general purpose sealing.

How to measure

• Outside diameter — across the widest point of the ring.
• Inside diameter — across the opening. On a flange, match the bore rather than the old gasket if the old one has been squeezed out of shape.
• Thickness — thinner compresses and conforms more readily; thicker fills a larger gap.

If you have a drawing instead of measurements, upload a DXF and we cut the outline exactly as drawn, including any bolt holes.

Related shapes

Need bolt holes around the ring? Use flange gaskets. Square or rectangular rather than round? See square ring and rectangular ring gaskets.

Pricing and shipping

Instant pricing from your dimensions and material, quantity discounts applied automatically, and most orders ship in one business day. Large orders may take longer.