Semi hex self-locking rivet nut

LOADING ZOOM

Semi-hex Self-locking Rivet Nut – Deform-Nut® ETC/A & ETFM/A

What is a self-locking rivet nut?

The open semi-hex Deform-Nut® rivet nut with integrated thread-locking nylon ring — developed by Specialinsert® — gives you a secure internal thread in thin sheet metal, while preventing loosening under vibration.
It is available both in zinc-plated steel and stainless steel 304. Two head types are offered: flat head (ETC/A) and reduced-head (ETFM/A).
Installation is easy using a manual, electric or pneumatic rivet-nut tool: the nut deforms behind the sheet, forming a strong, vibration-resistant connection.

Description

Key Features

Suitable for sheet thickness from 0.5 mm up to 6.0 mm.
Material options: zinc-plated steel or stainless steel 304.
Semi-hexagonal body to resist rotation — preventing the nut from turning inside the sheet under torque or vibration.
Inner thread immediately usable after installation — no need for tapping.
Suitable for blind-side installation (one-sided access), ideal for profiles, enclosures or assemblies where backside is not accessible.

Advantages of Using This Rivet Nut

Reliable, reusable threaded connection

Once installed, it provides a robust internal thread.

Resistant to vibration and loosening

The self-locking nylon ring combined with the semi-hex body prevents loosening and rotation — perfect for environments exposed to vibration or dynamic loads.

Blind-side installation

Allows fastening where only one side of the sheet is accessible — useful for tubular profiles, closed sections or confined assemblies.

Simple and cost-effective assembly

Installation does not require welding or tapping — just a rivet-nut tool and a suitably drilled hole. Reduces labor, avoids heat or distortion, and works even on coated materials.

Recommended Use & Tips

Punch the correct hole according to thread size and sheet thickness.
Use a rivet-nut tool (manual, pneumatic or electric) to install. Screw the blind rivet nut onto the mandrel of the installation tool without touching the nylon ring.
Seat the nut so the head is flush with the sheet surface.
Tighten the screw through the self-locking ring — the connection is now set, vibration-resistant and ready for load.
For maximum security in vibrating or dynamic applications: verify grip range is correct and retighten if required.

When to Choose Steel vs Stainless Steel

Zinc-plated steel — suitable for general indoor applications or where corrosion risk is limited.
Stainless steel 304 — recommended for outdoor or where long-term durability is a requirement.