Concealer plugs – an efficient solution for cooled tools

Concealer plugs are the quick and easy solution for all types of tooling with cooling channels – including blow moulds, injection moulds, vacuum moulds, and extrusion tools. Concealer plugs provide a reliable seal and secure connection inside the cooling system, ensuring smooth, efficient performance and temperature control in your production setup.

What are concave Plugs?

Concealer plugs are precision components made from galvanized steel, designed for sealing or connecting cooling channels in industrial tools. Their purpose is to close off openings or link cooling lines effectively and quickly, which is essential in modern tooling where precise temperature regulation directly impacts product quality and efficiency.
In addition to galvanized steel, concealer plugs can also be manufactured from aluminium, stainless steel, or copper on request – providing options for different levels of corrosion resistance, strength, and thermal conductivity. Whether you’re maintaining a high-temperature extrusion tool or a fine-tuned injection mould, concealer plugs ensure leak-free performance and stable operation.

Standard types of concealer plugs

The concave plugs are supplied in 3 standard shapes and 42 different sizes:

Round concealer plugs Available in diameters:

8mm – 9mm – 10mm – 11mm – 12mm – 14mm – 15mm – 16mm – 18mm – 20mm – 22mm – 25mm

Konkavpropper – effektiv løsning til værktøj med
køling

Oval plugs - Available in diameter:

10x24mm – 10x26mm – 10x28mm – 10x30mm – 10x32mm – 10x34mm – 10x36mm – 12x27mm – 12x30mm – 12x32mm – 12x34mm – 12x36mm – 12x38mm – 14x30mm – 14x32mm – 14x34mm – 14x36mm – 14x38mm – 14x46mm – 16x30mm – 16x34mm – 16x36mm – 16x38mm – 17x38mm – 17x41mm – 17x44mm – 17x47mm – 20x50mm

Special plugs (vaulted shape) - Available in diameter:

R20x62,37x14mm – R28x53x14mm

With such a broad selection, you’ll have no trouble finding the exact concealer plug shape or size you need. This versatility allows for flexible and efficient tool design without compromising sealing quality.

Customized concealer plug solutions

Do you need a size that is not available in the standard types? Concave plugs can also be manufactured to individual measurements, so you get a solution that fits your cooling channels and your tool exactly. Please contact us to have a customized Concave Plug solution made.

Advantages of choosing concave plugs from 4tools.dk

Choosing concealer plugs from 4tools.dk comes with several clear benefits:

Versatility — Three plug types and over 42 available sizes – plus custom manufacturing – cover almost every need.
Material Quality — Made from durable galvanized steel for strength, corrosion resistance, and reliable sealing.
Efficiency — Quick to install – simply press, fix, and seal. No complicated assembly required.
Customization — Optional tailor-made solutions ensure perfect fit and maximum cooling performance.

This combination of flexibility, quality, and ease of use makes concealer plugs an excellent choice for anyone working with tools that include cooling systems.

Areas of application

Concealer plugs are ideal for tools with cooling channels — both in mold making, vacuum processes and injection molding. They ensure tight sealing and precise control of the cooled flow. If you want to achieve reliable cooling and high production quality, Concealer plugs a natural choice in your tool arsenal.

It's that easy…

Closure of cooling ducts

1. First, mill a recess around the cooling duct (2-4mm larger than the diameter of the cooling duct and at least 3mm deep).

2. The concave plug is pressed down into the recess with locktite.

3. The concave stopper is fixed with a mandrel and hammer. When the concave surface is pressed down, the concave plug expands, thus closing the channel completely.

Connection of cooling ducts

1. Between the cooling ducts to be connected, first cut a depression with the same diameter as the ducts and an additional depth of 3 mm.

2. Close the recess on the extra 3 mm, as described in steps 2-3 under "closing the ducts"

Order your Concave plugs today

Ready to order concealer plugs in standard sizes, oval forms, or custom dimensions? Contact us today through the form at 4tools.dk, and we’ll provide you with a prompt quotation. With the right concealer plugs, your cooling channels remain sealed, protected, and fully functional – ensuring smooth operation and longer tool life. Simplify your workflow, improve efficiency, and achieve better cooling results with durable concealer plugs from 4tools.

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