A D-shape gasket has one flat side and one curved side — the half-circle profile used for access ports, tank lids, and hatches. We laser-cut custom D-shape gaskets to your exact dimensions in any material, no minimum order, shipped within 24 hours. Dimensions You Enter for a D-Shape Gasket Width (flat side) Length of the straight edge Height Depth from the flat side to the curve Thickness 1/16", 1/8", 3/16", or 1/4" 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 D-Shape Gasket Applications D-shaped access ports and covers Tank lid and hatch seals Half-round window and vent gaskets Specialty enclosure openings Custom cover-plate seals D-Shape Gasket FAQs What is a D-shape gasket?A D-shape (or half-circle) gasket has one straight edge and one semicircular edge, forming the letter D. It seals half-round openings and access ports.How do I specify a D-shape gasket?Enter the width of the flat side and the height to the curved edge. We cut the D profile to those exact dimensions in your chosen material. Enter your dimensions in the quote tool above for an instant price on custom d-shape gaskets from Fastest Gaskets — no minimum order, ships in 24 hours. {"@context":"https://schema.org","@type":"FAQPage","mainEntity":[{"@type":"Question","name":"What is a D-shape gasket?","acceptedAnswer":{"@type":"Answer","text":"A D-shape (or half-circle) gasket has one straight edge and one semicircular edge, forming the letter D. It seals half-round openings and access ports."}},{"@type":"Question","name":"How do I specify a D-shape gasket?","acceptedAnswer":{"@type":"Answer","text":"Enter the width of the flat side and the height to the curved edge. We cut the D profile to those exact dimensions in your chosen material."}}]}
