A premium laboratory grade tapered cork, these XXXX Premium Grade Cork Stoppers function as a closure for bottles, vials, laboratory and other openings. The XXXX Premium Grade has fewer lenticels (crevices) than standard grade. This means they are better suited for use as laboratory corks and for transporting many kinds of liquids. Cork Stoppers are safe to 300 degrees F (150 C). Many sizes are available to plug openings from 1/8" up to 2". All our Cork Stoppers are made from 100% natural cork. Bulk discounts available.
How to choose the right size cork stopper. As a general rule, select a cork with the biggest bottom diameter equal to or smaller than your opening. Size by the bottom diameter only — never by the top diameter. The top diameter is the point at which the cork would fall through. |
Buy laboratory grade corks below
Size 0000 Cork Stoppers, XXXX Grade
Top Diameter: 3/16" (.187" or 4.75mm)
Bottom Diameter: 3/32" (.093" or 2.35mm)
Length: 1/2" (.500" or 13mm)
Bottom Diameter: 3/32" (.093" or 2.35mm)
Length: 1/2" (.500" or 13mm)
Size 000 Cork Stoppers, XXXX Grade
Top Diameter: 1/4" (.250" or 6mm)
Bottom Diameter: 5/32" (.156" or 4mm)
Length: 1/2" (.500" or 13mm)
Bottom Diameter: 5/32" (.156" or 4mm)
Length: 1/2" (.500" or 13mm)
Size 00 Cork Stoppers, XXXX Grade
Top Diameter: 5/16" (.312" or 8mm)
Bottom Diameter: 7/32" (.218" or 5mm)
Length: 1/2" (.500" or 13mm)
Bottom Diameter: 7/32" (.218" or 5mm)
Length: 1/2" (.500" or 13mm)
Size 0 Cork Stoppers, XXXX Grade
Top Diameter: 3/8" (.385" or 10mm)
Bottom Diameter: 9/32" (.281" or 7mm)
Length: 1/2" (.500" or 13mm)
Bottom Diameter: 9/32" (.281" or 7mm)
Length: 1/2" (.500" or 13mm)
Size 1 Cork Stoppers, XXXX Grade
Top Diameter: 7/16" (.437" or 11mm)
Bottom Diameter: 21/64" (.328" or 8mm)
Length: 5/8" (.625" or 16mm)
Bottom Diameter: 21/64" (.328" or 8mm)
Length: 5/8" (.625" or 16mm)
Size 2 Cork Stoppers, XXXX Grade
Top Diameter: 1/2" (.500" or 12mm)
Bottom Diameter: 3/8" (.385" or 10mm)
Length: 11/16" (.687" or 17mm)
Bottom Diameter: 3/8" (.385" or 10mm)
Length: 11/16" (.687" or 17mm)
Size 3 Cork Stoppers, XXXX Grade
Top Diameter: 9/16" (.562" or 14mm)
Bottom Diameter: 27/64" (.422" or 11mm)
Length: 3/4" (.750" or 19mm)
Bottom Diameter: 27/64" (.422" or 11mm)
Length: 3/4" (.750" or 19mm)
Size 4 Cork Stoppers, XXXX Grade
Top Diameter: 5/8" (.625" or 16mm)
Bottom Diameter: 15/32" (.469" or 12mm)
Length: 13/16" (.813" or 20mm)
Bottom Diameter: 15/32" (.469" or 12mm)
Length: 13/16" (.813" or 20mm)
Size 5 Cork Stoppers, XXXX Grade
Top Diameter: 11/16" (.687" or 17.5mm)
Bottom Diameter: 17/32" (.531" or 13.5mm)
Length: 7/8" (.875" or 22mm)
Bottom Diameter: 17/32" (.531" or 13.5mm)
Length: 7/8" (.875" or 22mm)
Size 6 Cork Stoppers, XXXX Grade
Top Diameter: 3/4" (.750" or 19mm)
Bottom Diameter: 37/64" (.578" or 15mm)
Length: 15/16" (.938" or 24mm)
Bottom Diameter: 37/64" (.578" or 15mm)
Length: 15/16" (.938" or 24mm)
Size 7 Cork Stoppers, XXXX Grade
Top Diameter: 13/16" (.813" or 21mm)
Bottom Diameter: 5/8" (.625" or 16mm)
Length: 1" (1.000" or 25mm)
Bottom Diameter: 5/8" (.625" or 16mm)
Length: 1" (1.000" or 25mm)
Size 8 Cork Stoppers, XXXX Grade
Top Diameter: 7/8" (.875" or 22mm)
Bottom Diameter: 43/64" (.672" or 17mm)
Length: 1-1/16" (1.062" or 27mm)
Bottom Diameter: 43/64" (.672" or 17mm)
Length: 1-1/16" (1.062" or 27mm)
Size 9 Cork Stoppers, XXXX Grade
Top Diameter: 15/16" (.937" or 24mm)
Bottom Diameter: 47/64" (.734" or 18mm)
Length: 1-1/8" (1.125" or 29mm)
Bottom Diameter: 47/64" (.734" or 18mm)
Length: 1-1/8" (1.125" or 29mm)
Size 10 Cork Stoppers, XXXX Grade
Top Diameter: 1" (1.000" of 25mm)
Bottom Diameter: 49/64" (.765" or 20mm)
Length: 1-1/4" (1.250" or 31mm)
Bottom Diameter: 49/64" (.765" or 20mm)
Length: 1-1/4" (1.250" or 31mm)
Size 11 Cork Stoppers, XXXX Grade
Top Diameter: 1-1/16" (1.062" or 27mm)
Bottom Diameter: 53/64" (.828" or 21mm)
Length: 1-1/4" (1.250" or 31mm)
Bottom Diameter: 53/64" (.828" or 21mm)
Length: 1-1/4" (1.250" or 31mm)
Size 12 Cork Stoppers, XXXX Grade
Top Diameter: 1-1/8" (1.125" or 29mm)
Bottom Diameter: 57/64" (.890" or 22mm)
Length: 1-1/4" (1.250" or 31mm)
Bottom Diameter: 57/64" (.890" or 22mm)
Length: 1-1/4" (1.250" or 31mm)
Size 13 Cork Stoppers, XXXX Grade
Top Diameter: 1-3/16" (1.187" or 30mm)
Bottom Diameter: 61/64" (.953" or 24mm)
Length: 1-1/4" (1.250" or 31mm)
Bottom Diameter: 61/64" (.953" or 24mm)
Length: 1-1/4" (1.250" or 31mm)
Size 14 Cork Stoppers, XXXX Grade
Top Diameter: 1-1/4" (1.250" or 32mm)
Bottom Diameter: 1" (1.00" or 25mm)
Length: 1-1/4" (1.250" or 31mm)
Bottom Diameter: 1" (1.00" or 25mm)
Length: 1-1/4" (1.250" or 31mm)
Size 15 Cork Stoppers, XXXX Grade
Top Diameter: 1-5/16" (1.312" or 33mm)
Bottom Diameter: 1-1/16" (1.062" or 26mm)
Length: 1-1/4" (1.250" or 31mm)
Size 16 Cork Stoppers, XXXX Grade
Top Diameter: 1-3/8" (1.385" or 35mm)
Bottom Diameter: 1-3/32" (1.093" or 27mm)
Length: 1-1/2" (1.500" or 38mm)
Bottom Diameter: 1-3/32" (1.093" or 27mm)
Length: 1-1/2" (1.500" or 38mm)
Size 17 Cork Stoppers, XXXX Grade
Top Diameter: 1-7/16" (1.417" or 36mm)
Bottom Diameter: 1-1/8" (1.180" or 30mm)
Length: 1-1/2" (1.500" or 38mm)
Bottom Diameter: 1-1/8" (1.180" or 30mm)
Length: 1-1/2" (1.500" or 38mm)
Size 18 Cork Stoppers, XXXX Grade
Top Diameter: 1-1/2" (1.500" or 38mm)
Bottom Diameter: 1-7/32" (1.218" or 31mm)
Length: 1-1/2" (1.500" or 38mm)
Bottom Diameter: 1-7/32" (1.218" or 31mm)
Length: 1-1/2" (1.500" or 38mm)
Size 19 Cork Stoppers, XXXX Grade
Top Diameter: 1-17/32" (1.535" or 39mm)
Bottom Diameter: 1-9/32" (1.282" or 33mm)
Length: 1-1/2" (1.500: or 38mm)
Bottom Diameter: 1-9/32" (1.282" or 33mm)
Length: 1-1/2" (1.500: or 38mm)
Size 20 Cork Stoppers, XXXX Grade
Top Diameter: 1-5/8" (1.625" or 41mm)
Bottom Diameter: 1-11/32" (1.344" or 34mm)
Length: 1-1/2" (1.500" or 38mm)
Top Diameter: 1-5/8" (1.625" or 41mm)
Bottom Diameter: 1-11/32" (1.344" or 34mm)
Length: 1-1/2" (1.500" or 38mm)
Size 22 Cork Stoppers, XXXX Grade
Top Diameter: 1-3/4" (1.732" or 44mm)
Bottom Diameter: 1-15/32" (1.496" or 38mm)
Length: 1-1/2" (1.496" or 38mm)
Bottom Diameter: 1-15/32" (1.496" or 38mm)
Length: 1-1/2" (1.496" or 38mm)
Size 24 Cork Stoppers, XXXX Grade
Top Diameter: 1-7/8" (1.890" or 48mm)
Bottom Diameter: 1-19/32" (1.575" or 40mm)
Length: 1-1/2" (1.496" or 38mm)
Bottom Diameter: 1-19/32" (1.575" or 40mm)
Length: 1-1/2" (1.496" or 38mm)
Size 26 Cork Stoppers, XXXX Grade
Top Diameter: 2" (2.008" or 51mm)
Bottom Diameter: 1-23/32" (1.732" or 44mm)
Length: 1-1/2" (1.496" or 38mm)
Bottom Diameter: 1-23/32" (1.732" or 44mm)
Length: 1-1/2" (1.496" or 38mm)
Size 28 Cork Stoppers, XXXX Grade
Top Diameter: 2-1/8" (2.126" or 54mm)
Bottom Diameter: 1-27/32" (1.850" or 47mm)
Length: 1-1/2" (1.496" or 38mm)
Bottom Diameter: 1-27/32" (1.850" or 47mm)
Length: 1-1/2" (1.496" or 38mm)