What these M3 brass inserts do

These brass flanged expanding inserts create durable M3 threads in plastic parts for repeated fastening. The reversed through-hole design is intended for plastic assemblies that need a matching insert style with a flange for seating and support.

Key features of the flanged expanding insert design

• M3 machine thread: Provides a standard metal thread for M3 screws in plastic components.
• Brass construction: Brass is widely used for threaded inserts because it offers good durability, corrosion resistance, and reliable threading performance.
• Flanged body: The flange helps locate the insert and can assist with load distribution at the entry point of the hole.
• Expanding insert style: Expanding inserts are used to improve retention in plastic when the part is designed for that installation method.
• Reversed through-hole format: This version is intended for through-hole applications that specifically call for the reversed insert orientation.
• 10-pack quantity: Suitable for small builds, repair work, prototypes, and replacement stock.

Where these threaded inserts are commonly used

M3 brass inserts for plastic are commonly used in 3D printed enclosures, jigs, fixtures, brackets, tool mounts, electronic housings, and general-purpose plastic assemblies. They are useful anywhere a plastic part needs a reusable machine thread instead of relying on direct screw threads cut into the plastic.

Why builders use metal inserts in plastic parts

Plastic threads can wear over time, especially in parts that are assembled more than once. A brass insert gives the assembly a more durable fastening point, which is useful for maintenance access panels, modular printed parts, and components that may be adjusted or replaced.

Best fit for custom and printed components

These inserts are best suited to makers, engineers, and repair users designing around M3 hardware in plastic. For reliable results, the receiving hole and part geometry should be matched to this specific flanged, reversed through-hole insert style before installation.