• Square Gaskets with Rounded Corners - Fastest Gaskets
  • Square Gaskets with Rounded Corners - Fastest Gaskets
  • Square Gaskets with Rounded Corners - Fastest Gaskets
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Square Gaskets with Rounded Corners — Instant Quote

Square Gaskets with Rounded Corners — Instant Quote

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A square gasket has four equal sides, cut to your exact size for square covers, boxes, and ducts. We CNC cut (laser, waterjet, and more) custom square gaskets in any material with clean, consistent edges, no minimum order, shipped within one business day. Cut to ±0.015″ tolerance. Up to 32.5″ × 32.5″ for most materials.

Dimensions You Enter for a Square Gasket

Side length Length of each equal side
Thickness 1/16", 1/8", 3/16", or 1/4"
Corners Square or rounded
Material Any elastomer or fiber

Available in every material we stock — neoprene, silicone, EPDM, Buna-N, Viton, PTFE, cork, and fiber. Additional specs on request.

Common Square Gasket Applications

  • Square access covers and lids
  • Electrical box and panel seals
  • Square duct flanges
  • Equipment and instrument enclosures
  • Skylight and vent covers

Square Gasket FAQs

What size square gaskets can you cut?

Enter the side length in the quote tool and we cut a square gasket to that exact size, with square or rounded corners, in your chosen material and thickness.

Do you cut square gaskets with rounded corners?

Yes — a rounded-corner square version is available in the configurator for enclosures that use radiused corners.

How are your gaskets cut and how accurate are they?

CNC cut (laser, waterjet, and more) to ±0.015″ tolerance.

How fast do square gaskets with rounded corners ship?

Most orders ship in one business day. Large orders may take longer.

Enter your dimensions in the quote tool above for an instant price on custom square gaskets from Fastest Gaskets — no minimum order, ships in one business day. Large orders may take longer.

Related

Need help before you order?

Which material should I pick?

Full comparison on our Materials Guide.

  • Hot parts with oil or fuel (engines, exhaust) → Viton (FKM)
  • Hot parts, no oil (ovens, HVAC) → Silicone
  • Oil or fuel (pumps, hydraulics, petroleum) → Buna-N (Nitrile) — or Viton for higher heat
  • Water / outdoor / sun → EPDM
  • General automotive or light oil → Neoprene
  • Chemicals / aggressive fluids → PTFE (Teflon) — or Viton for high heat plus chemicals
  • Soft seal / uneven surfaces / low pressure → Cork blends

Not sure which material fits? Email us at fastestgaskets@gmail.com.

We CNC cut (laser, waterjet, and more) to ±0.015″. Up to 32.5″ × 32.5″ for most materials; the quote tool shows the exact limit for the one you pick. Ships in one business day. Large orders may take longer.

How to measure
  1. Measure the outside size — diameter for rounds, or length × width for rectangles and squares.
  2. Measure the inside opening and any holes (ID, bolt holes, bolt circle if it is a flange).
  3. Note the thickness you need — pick it in the quoter.
  4. Enter sizes in inches.
  5. Already have a drawing? Upload a DXF for an instant price.

More detail: Measuring Guide. Materials: Materials Guide.