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Knock-in insert stainless steel

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Knock-in insert stainless steel
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Keep-Nut® stainless steel303 – Press-Fit Insert for Hard Materials

What is the Keep-Nut® stainless steel303?

The Keep-Nut® is a high-quality stainless-steel303 insert designed for direct installation in very hard materials from approx. 6mm thickness. It enables the creation of a robust internal thread without glue and without a special bore-hole.

Description

Specifications

  • Made of stainless steel grade 303 (type IM-S, no flange)

  • Consists of a threaded socket surrounded by one or more elastic crowns, held temporarily by a nylon ring until after installation

  • Standard outer diameter: 12.5mm

  • Internal threads available: M4, M5 and M6, with versions sporting 1, 2 or 4 crowns

  • Versions with 2 or 4 crowns are also offered in stainless steel grade 316 and come with ETA approval for façade panel applications.

How to install a Keep-Nut®

This Keep-Nut® in stainless steel303 IM-S press-fit insert without flange requires only the correct hole diameter of Ø:12.0mm and the right hole depth, then can be driven in with a hammer (or a simple tool for very thin panels).
For installation in crack & scratch-sensitive panels or tiles the black PKN tool is recommended to protect the decorative panels and avoid damage.
For cases where drilling depth cannot always be guaranteed, a special installation tool is available to ensure safe installation. Note: the internal thread of the Keep-Nut® in stainless steel303 IM-S is not fully through-tapped, so that overly long screws cannot damage thin panels or tiles. Standard sizes available in M4, M5 and M6.

Applications & Benefits

Ideal thread-anchor for panels made of ceramic, HPL, Corian, solid surfaces, composite, natural stone, and even hardened glass!
We also provide the corresponding drills for natural stone & ceramic for drilling according to the installation instructions of the Keep-Nut® IM-S, plus a GO-NO-GO gauge to verify the hole diameter tolerances.

Download & Request Sample

A full technical PDF-spec sheet for the Keep-Nut® in stainless steel303 is available for download and you can request a free sample to test performance in your specific application.

Frequently asked questions about Knock-in insert stainless steel

Do you need adhesive or undercut drilling?

No — the Keep-Nut only requires a standard cylindrical hole; no undercut drilling or adhesive is needed.

How is the Keep-Nut installed?

Steps: drill the hole according to the specifications (diameter + depth), check the dimensions using a Go/No-Go gauge, screw the insert onto the PKN tool, hammer it into the hole, and then unscrew the PKN tool — the insert is now ready for use.

For non-sensitive and/or scratch-resistant panels, the Keep-Nut can simply be hammered directly into the prepared hole.

In which materials can the Keep-Nut® be used?

Examples include granite, marble, travertine, fiber cement, HPL, solid surface, tempered glass, and composite panels. In some fiber cement boards, the insert can also be used, but testing is recommended first.

What is the Keep-Nut® insert?

It is a press-in threaded insert that creates a permanent internal stainless steel thread in panels made of natural stone, composite, HPL, glass, and other solid-surface materials — requiring only a standard cylindrical hole.



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