What is the tolerance for injection molding?

Definition of injection molding tolerance

Tolerance refers to the allowable size deviation range of the product, that is, the allowable difference between the actual size of the product and the design size. In injection molding, tolerance control directly affects the dimensional accuracy, assembly performance and service life of the product. Generally, the tolerance of injection molding can be divided into the following levels:

General accuracy tolerance: ±0.1mm ~ ±0.2mm
High precision tolerance: ±0.05mm ~ ±0.1mm
Ultra-high precision tolerance: ±0.02mm ~ ±0.05mm
It should be noted that the above is the accuracy range of small size products. Specific tolerance requirements need to be determined based on the product's use, material characteristics, size and design complexity.

Tolerance requirements for typical industries

Electronics industry

For mobile phone shells, connectors and other products, the tolerance is usually required to be ±0.02mm to ±0.05mm, and some require up to 0.01mm.

Home appliance industry

Home appliance industry product range is large, small products have higher accuracy requirements, some waterproof requirements of the accuracy of ±0.02mm, there is a slightly higher assembly needs, tolerances are generally controlled between ±0.2mm and ±0.05mm. For large-size products, the accuracy of ±0.1mm or ±0.2mm is usually high precision, which should refer to the product size.

Daily necessities industry

Usually most products do not have high tolerance requirements, the need for assembly needs is slightly higher, high-quality products require slightly higher requirements, and the tolerance is generally controlled between ±0.2mm and ±0.05mm.

Medical device

Medical device parts require high precision and high reliability, and the tolerance is generally controlled between ±0.01mm and ±0.05mm.

Automobile industry

Auto parts such as instrument panels, decorative parts, etc., tolerance requirements between ±0.05mm~±0.1mm.