Din 16742 - Tg5 -

Understanding DIN 16742 - TG5: The Standard for Plastic Precision

The Geometry: The part was deep, requiring a significant draft angle to ensure it didn't scratch or get stuck when ejected from the mold. The Friction Point din 16742 - tg5

TG1 - TG4: Reserved for extreme or high-precision parts (e.g., medical connectors or aerospace components). Understanding DIN 16742 - TG5: The Standard for

1. Optical comparators for contour (not calipers alone).
2. Surface profilometers for Rz values.
3. First article inspection (FAI) with 30+ consecutive parts from 4 cavities to measure capability.
4. Defect catalog: Air traps < 0.1 mm depth, no visible weld lines on functional surfaces.

Small features (under 1mm) might have a tolerance of ±0.05mm. Optical comparators for contour (not calipers alone)

• Precision bearings and gear housings.
• Optical components (lens holders, light guides) where sink marks cause refraction.
• Sealing surfaces in fluid handling (valve bodies).
• Snap-fit assemblies where over-stressing the latch causes fracture.

When using this standard, a "useful" post or engineering drawing must specify if the dimension is mold-fixed or non-mold-fixed:

Achievability: While standard injection molding often defaults to TG6 for general dimensions, TG5 is considered a feasible standard for high-quality parts when the process is well-optimized.