Silicone Stopper Size Chart

2021-04-24 · Stoppers & Plugs

Silicone Stopper Size Chart

A silicone stopper size chart helps match a stopper to a vessel opening. For a tapered stopper, compare the top diameter, bottom diameter and height with the neck geometry and required insertion depth. Check the units and the drawing associated with the chart rather than relying only on a size number.

Flask capacity and test-tube length do not uniquely define the opening. A 500 ml flask and a 250 ml flask, for example, cannot be assigned the same stopper solely from their capacities. Measure the neck or use the vessel’s specified closure dimensions before choosing the corresponding chart row.

Select a solid stopper for a closed body or a bored stopper where a tube or probe must pass through. For a bored design, specify the hole diameter and location as well as the outer dimensions. The silicone compound must also suit the contents and operating conditions; dimensional fit does not establish chemical compatibility.

All dimensions are in mm

Stopper & Plug Size Catalog

Compare four stopper profiles and check the selected part dimensions against your opening and available depth. Each profile has its own drawing and dimension meanings.

Custom colors are available to your Pantone color code. Include the code in your inquiry.

RST T-Shaped Plugs

Match stem diameter A, flange diameter B, stem length C and flange thickness D. E refers to the underside recess; use the selected row and approved drawing to confirm the actual profile.

T-shaped stopper — original A, B, C, D and E dimensions — A recessed RST variant is illustrated. The head remains closed. Check E and the approved section for the selected part.

Rubber Silicone Plugs(T-shaped-RST) — product view — Illustrative product rendering. Refer to the selected part drawing and table for dimensions.

PartNo.	A（mm）	B（mm）	C（mm）	D（mm）
RST2.5-5.5-5.3	2.5	5.5	5.3	2
RST2.7-5.5-5	2.7	5.5	5	2
RST3-4.3-4.5	3	4.3	4.5	0.8
RST3-7-7	3	7	7	2.2
RST3.3-6.5-6	3.3	6.5	6	1.5
RST3.5-6.5-6	3.5	6.5	6	2
RST3.8-7-10.5	3.8	7	10.5	1.5
RST3.8-7-7	3.8	7	7	1.5
RST3.8-7-6	3.8	7	6	1.5
RST4-7.5-6	4	7.5	6	2
RST4-9.5-7	4	9.5	7	2.5
RST4.3-8-6	4.3	8	6	1.5
RST4.5-7.5-6	4.5	7.5	6	2
RST4.8-6.8-3.6	4.8	6.8	3.6	0.9
RST4.8-9-7	4.8	9	7	1.5

RSA Tapered Corks

Compare large-end diameter A, small-end diameter B and Height, in mm. The mating bore and required seating depth determine where the taper contacts the opening.

Tapered cork — Diameter A, Diameter B and Height — Tapered profile reference. Use Diameter A, Diameter B and Height from the selected row.

Rubber Corks(Tapered-RSA) — product view — Illustrative product rendering. Refer to the selected part drawing and table for dimensions.

Part No.	Diameter A	Diameter B	Height	Materials
RSA1.6-0.4-15.9	1.6	0.4	15.9	Silicone
RSA2-0.5-19.1	2	0.5	19.1	Silicone
RSA3.2-0.8-15.9	3.2	0.8	15.9	Silicone
RSA3.2-1.6-15.9	3.2	1.6	15.9	Silicone
RSA4.8-1.6-15.9	4.8	1.6	15.9	Silicone
RSA4.8-1.6-19.1	4.8	1.6	19.1	Silicone
RSA5.5-1.2-38.1	5.5	1.2	38.1	Silicone
RSA6.4-3.2-19.1	6.4	3.2	19.1	Silicone
RSA6.4-3.2-25.4	6.4	3.2	25.4	Silicone
RSA8.7-4.8-15.9	8.7	4.8	15.9	Silicone
RSA8.7-4.8-25.4	8.7	4.8	25.4	Silicone
RSA9.2-6.2-12.8	9.2	6.2	12.8	Silicone
RSA9.5-6.5-18.5	9.5	6.5	18.5	Silicone
RSA11-8.5-17.5	11	8.5	17.5	Silicone
RSA11.5-6.5-25	11.5	6.5	25	Silicone

RSB Undercut Plugs

Compare neck diameter A, flange diameter B, flange-to-lip distance C and flange thickness D. Check panel thickness and rear clearance. E refers to the underside recess.

Silicone Plugs(Undercut-RSB) — product view — Illustrative product rendering. Refer to the selected part drawing and table for dimensions.

Part No.	A (mm)	B (mm)	C (mm)	D (mm)	E (mm)
RSB2.5-6-3	2.5	6	3	1.5	0
RSB3-7-3	3	7	3	2	0
RSB3.5-7.5-3	3.5	7.5	3	2	0
RSB3.6-7.5-6	3.6	7.5	6	2	0
RSB4-8-3	4	8	3	2	0
RSB4.5-8.5-3	4.5	8.5	3	2	2
RSB5-9-3	5	9	3	2	2.5
RSB5.5-9.5-3	5.5	9.5	3	2	3
RSB6-10-4	6	10	4	2	3.5
RSB6.5-10.5-4	6.5	10.5	4	2	4
RSB6.5-12-8	6.5	12	8	2	0
RSB6.7-8.7-5.3	6.7	8.7	5.3	1.3	4.1
RSB7-11-4	7	11	4	2	4.5
RSB7.5-11.5-4	7.5	11.5	4	2	5
RSB8-12-4	8	12	4	2	5.5

RSD T-Shaped Stoppers

Compare stem diameter A, flange diameter B, stem length C and head thickness D, in mm. Check the seating surface and available depth as well as the hole diameter.

T-shaped stopper — original A, B, C and D dimensions — Solid T-shaped profile reference. Dimensions A–D follow the selected part drawing.

Silicone Stoppers(T shape) — product view — Illustrative product rendering. Refer to the selected part drawing and table for dimensions.

Part No.	A (mm)	B (mm)	C (mm)	D (mm)	Materials
RSD2.7-5.5-5	2.7	5.5	5	2	Rubber, Silicone
RSD3-7-7	3	7	7	2.2	Rubber, Silicone
RSD3.3-6.5-6	3.3	6.5	6	1.5	Rubber, Silicone
RSD3.5-6.5-6	3.5	6.5	6	2	Rubber, Silicone
RSD3.8-7-6	3.8	7	6	1.5	Rubber, Silicone
RSD4-9.5-7	4	9.5	7	2.5	Rubber, Silicone
RSD4.3-8-6	4.3	8	6	1.5	Rubber, Silicone
RSD4.5-7.5-6	4.5	7.5	6	2	Rubber, Silicone
RSD4.8-9-7	4.8	9	7	1.5	Rubber, Silicone
RSD5-12-8	5	12	8	2.8	Rubber, Silicone
RSD5.3-9.5-7	5.3	9.5	7	1.5	Rubber, Silicone
RSD5.5-8.5-7	5.5	8.5	7	2	Rubber, Silicone
RSD5.8-10-8	5.8	10	8	2	Rubber, Silicone
RSD6-13-8	6	13	8	3.5	Rubber, Silicone
RSD6.3-10.5-8	6.3	10.5	8	2	Rubber, Silicone

Need a different fit? Share the opening dimensions, mating profile and intended use for a custom size.

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Silicone Stopper Size Chart

Silicone Stopper Size Chart

All dimensions are in mm

Stopper & Plug Size Catalog

RST T-Shaped Plugs

RSA Tapered Corks

RSB Undercut Plugs

RSD T-Shaped Stoppers

Need a quote or a custom part?

Ready to Find Your Rubber Part?

Request a Quote

Silicone Stopper Size Chart

All dimensions are in mm​

Stopper & Plug Size Catalog

RST T-Shaped Plugs

RSA Tapered Corks

RSB Undercut Plugs

RSD T-Shaped Stoppers

Need a quote or a custom part?

Ready to Find Your Rubber Part?

All dimensions are in mm