M2 M3 M4 M5 Threaded Inserts, Brass Heat Set Inserts, 3D Printing Knurled Metric Nuts for Plastic, 3D Printing Components

Twisted double knurl design interlocks tightly with plastic, high pull-out & torque resistance, no rotation or loose after repeated disassembly

Standard metric coarse thread, smooth 6H precision thread, durable for multiple screw assembly

Gradual cone guiding design, uniform melt during heat insertion, prevent plastic cracking for thin wall plastic parts

Create sturdy metal female thread inside plastic, avoid stripped plastic threads