Rubber Hole Cover

Rubber Hole Cover

Choosing a cover for an unused panel opening

A rubber hole cover can finish an unused opening in an enclosure, furniture panel or equipment housing. For this type of application, the cover should sit neatly against the visible surface while its retaining feature engages the panel. Start with the purpose of the opening: a permanent blanking point, an occasional service access or a location reserved for a future cable connection. That decision affects both the required retention and the method of removal.

Measure the panel as well as the hole

The opening diameter is only one part of the fit. Record the panel thickness, the edge condition and the clearance behind it. A grooved cover needs a retaining section that suits the sheet thickness; a cover with a projecting body also needs room inside the enclosure. Check the head overlap on the outer face, particularly near a corner or an adjacent fastener. For an oval or irregular opening, include a sketch showing both directions instead of reducing the shape to one nominal diameter.

Evaluate the installed edge

During a trial fitting, look for a lip that remains flat around the opening and a body that stays located after normal handling. A curled edge, rocking head or cover that pushes through the panel indicates that the geometry needs attention. The condition of the mating surface matters too: a damaged or sharp rim can interfere with seating. If the enclosure is painted, carry out the fit check on the finished surface, since the coating is part of the final interface.

Define the service conditions

Record whether the cover will face outdoor exposure, cleaning chemicals or nearby heat, and identify the elastomer selected for those conditions. A cosmetic blanking cover and a closure intended to control fluid ingress have different acceptance requirements. For the latter, describe the required sealing performance at the outset. Keep a reference sample of the approved fit with the drawing, including the cover profile and panel details, so later orders can be compared against the same assembly.

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.

Blind-Hole · RSTTapered · RSAUndercut · RSBT-Shaped · RSD

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.

Dimension guide

Product appearance

PartNo.	A（mm）	B（mm）	C（mm）	D（mm）	E（mm）
RST2.5-5.5-5.3	2.5	5.5	5.3	2	0
RST2.7-5.5-5	2.7	5.5	5	2	0
RST3-4.3-4.5	3	4.3	4.5	0.8	0
RST3-7-7	3	7	7	2.2	0
RST3.3-6.5-6	3.3	6.5	6	1.5	0
RST3.5-6.5-6	3.5	6.5	6	2	0
RST3.8-7-10.5	3.8	7	10.5	1.5	0
RST3.8-7-7	3.8	7	7	1.5	0
RST3.8-7-6	3.8	7	6	1.5	0
RST4-7.5-6	4	7.5	6	2	0
RST4-9.5-7	4	9.5	7	2.5	0
RST4.3-8-6	4.3	8	6	1.5	0
RST4.5-7.5-6	4.5	7.5	6	2	0
RST4.8-6.8-3.6	4.8	6.8	3.6	0.9	0
RST4.8-9-7	4.8	9	7	1.5	0

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

Discuss Your Requirements