What are the tolerances for injection molding?

Injection molding is an efficient way to produce plastic products and is widely used in various fields such as automotive, electronics, electrical appliances, and medical. Tolerance control is critical when manufacturing high quality plastic products. So, what exactly are the tolerances of injection molding? What are the factors that affect the tolerance? This article will provide you with a detailed analysis.

I. Definition of injection molding tolerances

Tolerance refers to the permissible range of dimensional deviation of a product, i.e. the permissible difference between the actual size of the product and the designed size. In injection molding, tolerance control directly affects the dimensional accuracy, assembly performance and service life of the product. Usually, the tolerance of injection molding can be divided into the following levels:

• General Precision Tolerance: ±0.1mm ~ ±0.2mm
• High precision tolerances: ±0.05mm ~ ±0.1mm
• Ultra-high precision tolerances: ±0.02mm ~ ±0.05mm

It should be noted that the above is the range of accuracy for small size products. Specific tolerance requirements need to be determined based on factors such as product usage, material properties, size and design complexity.

II. Tolerance requirements for typical industries

• electronics industry
  For products such as cell phone housings, connectors, etc., the tolerance is usually required to be ±0.02mm to ±0.05mm, with some requirements reaching 0.01mm.
• Home Appliances Industry
  Home appliance industry, a large range of products, small products have high precision requirements, some have waterproofing requirements of precision ± 0.02mm, there is a need for assembly needs to be slightly higher, the tolerance is generally controlled in the ± 0.2mm ~ ± 0.05mm between. Large size products, usually accuracy ± 0.1mm or ± 0.2mm are high precision, specific reference to the product size.
• Daily necessities industry
  Usually most of the products do not have high tolerance requirements, there is a need for assembly needs to be slightly higher, the requirements of high-quality products is slightly higher, the tolerance is generally controlled in the ± 0.2mm ~ ± 0.05mm between.
• medical equipment
  Medical device parts require high precision and high reliability, the tolerance is generally controlled between ±0.01mm~±0.05mm.
• Automotive
  Automotive parts such as instrument panels and decorative parts require tolerances between ±0.05mm to ±0.1mm.

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