Ø18H20 Rubber Plug
Precise sealing – impressive durability & finish

A compact, high-elasticity rubber plug for sealing holes, threaded ends and metal surfaces in powder coating, plating, anodizing and dyeing processes – perfectly suited for industrial and export production lines.

High heat resistance and elasticity; hugs the surface tightly without leaving marks after removal.
Resistant to common chemicals and solvents used in plating, anodizing and powder coating.
High tensile strength and long service life, helping reduce replacement costs during operation.
Produced to export standards; custom sizes available on request.

Get a quick quotation ⟶ Technical consultation Our engineering team supports you in selecting suitable dimensions and materials for your application.

Ø18 H20

High-temperature
resistant & reusable

Classification of basic plug versions

Depending on the working environment and hole design, different plug types are recommended. Below are the most common Ø18H20 options.

No.	Product code	Key features	Suitable environment	Notes (colors)
01	Ø18H20-EPDM	EPDM rubber plug with good heat resistance, excellent ageing resistance and high elasticity.	Powder coating, zinc plating, outdoor environments, humidity and UV exposure.	Black White Custom
02	Ø18H20-SIL	Clean silicone rubber, very high temperature resistance, maintains shape after multiple cycles.	High-temperature ovens, powder coating lines, high-finish surface treatment.	Black White Custom
03	Ø18H20-NBR	Excellent resistance to oil and lubricants, provides highly reliable sealing.	Environments with hydraulic oil, cutting fluids and light solvents.	Black White Custom
04	Ø18H20-CUSTOM	Produced to drawing: adjustable length H, rounded edge, pull tab, color coding and more.	Automated lines where quick handling and visual identification are required.	Black White Custom

Technical data – Ø18H20 plug

Standard dimensions are optimized for nominal hole Ø18 mm with working depth H = 20 mm. Dimensions can be fine-tuned to suit your actual parts.

Dimensions

Outer Ø18 mm · H = 20 mm

The working diameter can be adjusted by ±0.3 mm depending on hole tolerance.

Materials

EPDM / Silicone / NBR

Select according to process temperature range and chemical exposure.

Temperature range

-20 °C → 250 °C*

*Depending on material: EPDM up to approx. 150 °C, Silicone up to 250 °C.

! Besides Ø18H20, we design and provide free 3D simulations for other plug sizes on request.

Typical applications

Ø18H20 rubber plugs are widely used in processes requiring high-quality surface finish, minimizing burrs, paint runs and scratches.

Coating & Plating

Sealing threaded and through holes, thin edges

Keeps threads free from paint and chemicals so that parts can be assembled easily after treatment, without re-cleaning.

Mechanical & Structural

Protecting hole edges during handling

Prevents dust, moisture and impacts from deforming edges; ideal for steel structures, frames and metal furniture.

Electrical & Electronics

Noise and vibration damping

Used as stoppers or small feet to reduce vibration transfer and avoid metal-to-metal contact.

Benefits of using our Ø18H20 rubber plugs

Optimized design for fast handling, thousands of plug–unplug cycles without tearing the lip.
Batch-by-batch quality control: hardness, dimensions, heat resistance and chemical resistance.
Custom colors (turquoise, yellow, red, …) for easy product code identification in the factory.
Free test samples available so your engineers can validate directly on the production line.

Sizing & storage guidelines

Selecting plug size for ceramic basins

During ceramic basin production, uneven shrinkage at high firing temperatures can cause deviations in the actual outlet hole size, especially its diameter. Field feedback shows that if the basin drain hole diameter is 18 mm, an 18 mm plug with slight adjustment for machining tolerance will provide an optimal fit – ensuring the plug is snug, not loose, and leak-free.

Measurement recommendation:

Before placing an order, carefully measure the inner diameter (ID) of the basin hole using a vernier caliper or digital caliper. Share the actual tolerance so our engineers can advise on the most suitable plug design and tolerance.

Proper storage & use

Store plugs in a cool, dry place away from direct sunlight and ambient temperatures above 40 °C.
Avoid placing products near high heat sources or aggressive chemicals outside the recommended range.
Clean the plugs periodically – they can be soaked in clean water and dried to keep the surface in good condition and extend service life.

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