Din 16742 - Tg5 -

Under DIN 16742, tolerances aren't a single flat number. They depend on the of the part. For a TG5 part:

Key characteristics include:

Features formed by moving components, such as across the mold parting line or by sliding cores. These receive wider tolerances to account for machine clamping variance and tool play. Material Classifications: Amorphous vs. Semi-Crystalline

DIN 16742 TG5 strikes an ideal balance between high-end dimensional precision and manufacturing viability. It challenges manufacturers to optimize their processes but rewards them with highly functional, reliable, and perfectly matching components. By understanding the interplay between polymer behavior, tool construction, and the nominal dimension scaling of TG5, engineering teams can confidently design next-generation plastic products. din 16742 - tg5

DIN 16742 - TG5 is approximately 15–20% tighter than the ISO “Fine” class. If you supply to German OEMs, specifying TG5 is non-negotiable for critical fitting surfaces.

TG5 is utilized when the component's functionality requires tight fitting or precise alignment. Typical applications include: Gears and technical drive components. Snap-fit connectors with tight tolerances. Medical device housings. Precision automotive components. Characteristics of TG5

The standard defines nine distinct tolerance groups (), where lower numbers represent tighter, more expensive precision and higher numbers represent wide, structural tolerances. Under DIN 16742, tolerances aren't a single flat number

Do not default to TG5. Specify it only for:

The test involves measuring the mass change of a sample as a function of temperature, typically in a inert atmosphere. This allows for the identification of decomposition temperatures, mass loss rates, and residual masses.

QA teams must use Coordinate Measuring Machines (CMM) or optical scanners, as standard calipers cannot reliably verify TG5 thresholds. Best Practices for Engineers These receive wider tolerances to account for machine

: Do not specify TG5 alongside an unfilled, high-shrinkage material like low-density polyethylene (LDPE) unless you are prepared for high scrap rates and extensive tool tuning.

[TG1 - TG2] --------> [TG3 - TG4] --------> [TG5 - TG6] --------> [TG7 - TG9] Precision Precision Commercial Coarse/Large (Toolmaking) (Industrial) (Standard MFG) (Low Accuracy)

: TG5 is considered the standard precision category. It is often applied as a general tolerance across various plastic materials, such as ABS or PC+ABS, to ensure a balance between manufacturing cost and part quality.

: Detail exactly how the quality control team should hold and measure the part on a Coordinate Measuring Machine (CMM). Plastic parts can easily deform under mechanical measurement pressure.

Understanding DIN 16742 - TG5: Precision Tolerances for Plastic Moulded Parts