300pcs Threaded Insert M2 M2.5 M3 M4 M5 M6 Nut Brass Bushings Internal Thread Knurled Nuts with Plastic Box for Parts by Heat or Ultrasonic in 3D Printer

7 models and 15 sizes: (dimensions in mm) M2 x 2.5 x 3.2, M2 x 3 x 3.2, M2 x 4 x 3.2, M2.5 x 4 x 3.5, M2.5 x 5 x 3.5, M3 x 4 x 5, M3 x 5. x 5, MM, 3 x 6 x 5, M4 x 4 x 6, M4 x 6 x 6, M4 x 8 x 6, M5 x 6 x 7, M5 x 10 x 7, M6 x 8 x 8, 1 / 4-20 x 12.7 x 8, total 300 pieces. in different compartments in one Plastic box and labelled to avoid confusion. 【Sturdy & Durable】Forged from pure copper, good thermal conductivity, fully automatic manufacturing process, deep thread, uniform gradient, smooth and burr-free surface, acid and alkali resistant, strong oxidation resistance, durable. Easy to install: insert the threaded nut into the hole and heat the nut with a soldering iron. After heating, the thread insert is pressed into the part. The screws are then mounted with the cooled nut. The nut can be easily inserted into the plastic part with either the ultrasonic or soldering iron. Application: TW1TGOFT knurled nuts are designed for thermoplastics. The threaded insert nuts are threaded connections for injection molding, circuit board assembly, electronic products and most plastic fastenings, e.g. PLA, PP, ABS, PPS, PETG. Attention: hot pressing process for nut inserts, please preheat the nut before pressing the lower process. Workers should wear insulated gloves when operating to avoid safety risks during operation.