Shop XXXX premium grade cork stoppers in bulk or by the piece: laboratory grade tapered corks for bottles, vials, lab glassware and openings from 1/8" to 2". Better for lab use and transporting liquids.
- Natural cork
- Food safe
- Sizes 0000 to 28
- Safe to 300°F (150°C)
Sizing tip: choose the cork with the biggest bottom diameter that is smaller than your opening. Never size by the top diameter.
Need a larger size? See our Large Natural Cork Stoppers & Natural Jar Corks.
More info XXX Standard Grade Extra Select
Shop XXXX Corks below
Any quantity · Better prices in bulk
XXXX Premium Grade has fewer lenticels (crevices) than XXX Standard Grade, which makes it better for laboratory corks and for transporting many kinds of liquids. For the finest grade, see Extra Select.
In stock at our Houston facility with bulk pricing; orders by 4pm CT ship the same business day.
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)