HELIFOUNER HELIFOUNER-Brass-Nut-Inserts M3 Brass Threaded Inserts, 100-Pack

Worth noting

Sized M3x6x5mm and made of brass, these HELIFOUNER female knurled nut inserts create an internal threaded point in plastic parts. The pack contains 100 inserts, making it practical to keep matching pieces on hand for a series of 3D-printed components or injection-molded projects. Their M3-0.5 thread and spline-style exterior are designed for use as embedded fasteners.

Use them when a plastic component needs a threaded connection for a bolt or screw. Brass construction and defined internal threads make these inserts a purpose-built alternative to relying on a thread formed directly in plastic.

Everyday use

The inserts suit 3D printing and injection molding, as well as plastic housings and components used in electronics, toys, lighting, and other listed applications. A threaded insert can provide a fastening point within the part, useful when a design calls for attaching or removing another component with a matching M3 fastener. The 100-piece quantity supports multiple parts or repeat project work.

Usage tips

Installation can be done by heat or ultrasonic placement into a tapered hole, or by molding the insert into the part during injection. Choose the approach that fits the plastic part and your manufacturing process. For heat installation, allow the plastic to cool fully before threading in a bolt, tightening while the material is still cooling can loosen the insert in the part. Need threaded attachment points in a custom plastic piece? These inserts are intended for that embedded-fastener role.

The knurled exterior is made to sit within the plastic, while the female thread receives the fastener. Match the M3-0.5 thread to the bolt or screw used in the assembly. Keep the small inserts away from children during handling and storage.

Questions before you buy

What thread size do these inserts use?

They have an M3-0.5 internal thread and are listed as M3x6x5mm. The pack includes 100 pieces.

How can they be installed?

They can be placed into a tapered hole using heat or ultrasonic installation, or incorporated during injection molding. When using heat, wait until the plastic has cooled before threading in a bolt.

What kinds of projects are they intended for?

They are intended for 3D-printing and injection-molding projects, including plastic casings and components for electronics, toys, lighting, and similar applications. Use them where a plastic part needs an embedded female-thread fastening point.

Should you buy it?

For makers and manufacturers building plastic parts around an M3 threaded connection, this 100-piece brass set offers a clearly sized insert for heat or ultrasonic placement, or integration during injection molding. It is a practical fit for 3D-printed parts, molded components, and plastic housings that need an embedded point for fastening.