An M2 insert typically refers to a threaded insert with an M2 thread size, which is a standard metric thread with a 2mm nominal diameter. These inserts are used to create durable threaded holes in softer materials like plastics, wood, or thin metals, allowing for secure fastening without the risk of stripping the material.

Types of M2 Inserts:

1. Heat-Set Inserts:

   • Used in plastics, these inserts are heated and then pressed into a hole in the plastic, melting the material slightly to form a strong bond.

2. Self-Tapping Inserts:

   • These inserts can be screwed directly into softer materials like wood or plastic. The threading on the outer surface cuts into the material as it’s installed, creating a firm fit.

3. Press-Fit Inserts:

   • Installed by pressing into a pre-drilled hole, they are used when no heat or threading is desired. The knurled or grooved outer surface provides a friction-based bond.

4. Ultrasonic Inserts:

   • Similar to heat-set inserts but installed using ultrasonic energy to melt the plastic, commonly used in high-volume manufacturing.

5. Threaded Inserts for Metals:

   • These inserts are used to add threads to thin sheet metal or other softer metals and can be installed by crimping or using a rivet-style tool.