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          FZ-M3x7.0-HD5.5

          FZ Inserts

          FZ Series Inserts

          The advantages:
          Injection molding.
          Straight knurling with groove design can provide strong torque and pulling force.
          Blind-end design can effectively prevent plastic backflow causing internal hole defects
          Suitable for thermoplastic plastics and thermosetting plastics.
           
          Installation instruction:
          Please put the threaded inserts into a reserved core pins, then closed the mold and mold it together with the plastic.
          The core pin is designed to match the bottom hole of the thread or be designed according to the size table. 
          If the core pin is smaller, it will cause the platic overflow into the internal thread; if the pin oversize, it will cause the inserts failed put into.
          REQUEST SAMPLES
          TECHNICAL PARAMETER
          FAQ
          A Thread size M3x0.5
          L Insert lengths 7.0 mm
          OD Insert diameter 5.5 mm
          HD Head diameter 5.5 mm
          C Min.Thread lengths 4.5 mm
          Base panel material Plastic
          Materials Brass
          Surface Treatment Cleaning
          Installation Equipment/Method Molded-in Threaded Inserts

          FZ Series Inserts data


          Common Thread Types for Plastics

          1. Coarse Threads (UNC / Metric Coarse)

          • Best for: Soft and ductile plastics (e.g., polyethylene, polypropylene)

          • Advantages:

            • Larger thread pitch and deeper engagement reduce stress concentration.

            • Less prone to stripping and thread deformation.

            • Suitable for applications with vibration or thermal cycling.

          2. Fine Threads (UNF / Metric Fine)

          • Best for: Hard and rigid plastics (e.g., glass-filled nylon, polycarbonate)

          • Advantages:

            • Provide higher clamping force with finer adjustment.

            • Better resistance to loosening in precision assemblies.

            • Reduce the risk of material cracking in brittle plastics.

          3. Self-Tapping Threads

          • Best for: Soft to medium-hard plastics where pre-tapped threads are not feasible.

          • Advantages:

            • Eliminate the need for pre-threading or inserts.

            • Designed with cutting flutes or tapered profiles to form threads during installation.

            • Reduce assembly time and cost.

          4. Helical Threads (for Inserts)

          • Best for: High-stress applications in thermoplastics and thermosets.

          • Advantages:

            • Large surface contact improves load distribution.

            • Reduce radial stress and prevent plastic creep.

            • Often used with ultrasonic or heat-installed inserts.

          5. Knurled or Barbed Threads

          • Best for: Soft plastics requiring high resistance to rotation.

          • Advantages:

            • Provide mechanical locking through material displacement.

            • Effective in preventing loosening under vibration.

            • Commonly used in press-fit and molded-in inserts.