Custom Square Ring Gaskets w/ Rounded Corners
Custom Square Ring Gaskets w/ Rounded Corners
A square ring gasket is a square with a square cutout — a frame seal for square hatches, bezels, and enclosures. We CNC cut (laser, waterjet, and more) custom square ring gaskets to your exact inner and outer sizes, no minimum order, shipped within one business day.
Dimensions You Enter for a Square Ring Gasket
| Outer side length | Outside of the square frame |
| Inner side length | The square cutout |
| Thickness | 1/16", 1/8", 3/16", or 1/4" |
| Corners | Square or rounded |
Available in every material we stock — neoprene, silicone, EPDM, Buna-N, Viton, PTFE, cork, and fiber. Additional specs on request.
Common Square Ring Gasket Applications
- Square hatch and access-frame seals
- Instrument and display bezels
- Square duct and vent flanges
- Enclosure perimeter gaskets
- Filter and screen frames
Square Ring Gasket FAQs
What is a square ring gasket?
A square ring gasket is a square frame — a square with a square hole in the center — used to seal around a square opening such as a hatch or vent.
How do I measure a square ring gasket?
Enter the outer side length and the inner (cutout) side length. We cut the frame to those exact dimensions with square or rounded corners.
Enter your dimensions in the quote tool above for an instant price on custom square ring gaskets from Fastest Gaskets — no minimum order, ships in one business day.
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
- Measure the outside size — diameter for rounds, or length × width for rectangles and squares.
- Measure the inside opening and any holes (ID, bolt holes, bolt circle if it is a flange).
- Note the thickness you need — pick it in the quoter.
- Enter sizes in inches.
- Already have a drawing? Upload a DXF for an instant price.
More detail: Measuring Guide. Materials: Materials Guide.