The best tolerance for precision injection molds typically depends on part precision requirements, material shrinkage rates, mold processing capabilities, and process control. In general, precision injection molds can achieve manufacturing tolerances of ±0.005 mm to ±0.01 mm (equivalent to IT6–IT7 grade or higher), while the final molded parts in high-precision applications can be stably controlled within ±0.01 mm to ±0.025 mm, with extreme cases approaching ±0.002 mm to ±0.005 mm (very tight tolerance).
For high-end fields such as optical lenses, medical devices, and automotive precision components, the optimal tolerance is often set around ±0.005 mm. This requires advanced equipment like high-precision CNC machining, CNC EDM, slow wire cutting, combined with constant-temperature workshops, premium steels (e.g., S136, 8407), and rigorous process optimization (temperature, pressure, uniform cooling) to achieve.
Why choose ATC-Mould? As a professional precision injection mold manufacturer with over 10 years of focus on high-precision custom molds, we consistently deliver IT7-grade or better molds with tolerances controlled within ±0.005 mm, helping clients achieve superior product consistency and assembly reliability. Whether you need optical-grade, medical-grade, or electronic precision molds, we offer one-stop services from design to trial molding to accelerate your project launch!
Precision injection molding starts with high-precision molds.