is the German standard for Tolerances for injection-molded plastic parts . It replaced older standards like DIN 16901. It provides a systematic way to define allowable deviations in dimensions, geometry, and surface for thermoplastics, thermosets, and elastomers.
When a part has justified high dimensional stability requirements beyond what general tolerances can provide, the designer may assign (i.e., a specific tolerance value attached to a particular dimension in the drawing). However, for economic reasons, the number of directly toleranced dimensions per moulded part should be kept as low as possible. din 16742 - tg5
Injection molding is a dynamic thermal process. Minor shifts in melt temperature, injection speed, hold pressure, or cooling time will alter the final dimensions of the part. TG5 requires closed-loop control molding machines and temperature-controlled post-molding environments to prevent warping. How to Apply TG5 Tolerances to Your Design is the German standard for Tolerances for injection-molded
: It is commonly used for industrial components and structural foam molding where a balance between cost-efficiency and technical performance is needed. Key Factors : The group assigned depends on the material's modulus of elasticity (stiffness) and its rate during cooling. Pekago Covering Technology Why TG5 Matters for Your Project When a part has justified high dimensional stability