M3 brass threaded inserts for stronger plastic threads

Brass Flanged Expanding Inserts for Plastic - Non Reversed - M3 - 10 Pack are metal threaded inserts designed to create durable M3 threads in plastic parts. They are used when a plastic component needs a more reliable fastening point than a directly tapped or self-threaded hole.

The brass construction helps improve thread life in parts that are assembled more than once. For 3D printed parts, jigs, fixtures, and plastic housings, an insert can reduce wear and help maintain a more secure screw connection over time.

Key features of the flanged non-reversed insert design

• M3 internal thread for standard M3 machine screws and matching hardware
• Brass construction for corrosion resistance and reliable thread engagement in plastic assemblies
• Flanged design to provide a defined seating surface during installation
• Expanding insert format intended for plastic components that require reinforced threads
• 10-pack quantity suited to small builds, repairs, and prototype work

Where M3 expanding inserts for plastic are commonly used

These inserts are well suited to 3D printed enclosures, brackets, tool mounts, robotics parts, electronics cases, and other plastic components that need repeatable fastening. An M3 insert is a practical choice for compact assemblies where small metric hardware is standard.

For maker and workshop use, brass inserts are commonly chosen when a part will be opened for maintenance, adjusted during testing, or reassembled multiple times. Adding a metal thread to a plastic part can improve serviceability and help extend the usable life of the component.