16742 - Tg5 | Din

Assuming you mean the German standard DIN 16742 (TG5) and want its proper name and main feature:

2. Surface Structure (The "5" in TG5) The standard strictly defines surface roughness based on comparator blocks. TG5 requires surfaces to be free from visible sink marks, flow lines, and ejector pin marks that exceed a depth of 0.02 mm. It aligns roughly with Rz 10–20 µm (average maximum height of the profile). din 16742 - tg5

• Measurements at 23°C ± 2°C, 50% RH, after 24h conditioning.
• Use 3D scanning or tactile CMM for critical areas.
• For large series: Statistical process control (SPC) with Cpk ≥ 1.0 is sufficient for TG5.
• Acceptable defects under TG5 (no special surface grade given): Visual class V3 (standard industrial) – slight sink marks, knit lines, minor gloss differences allowed.

standard is a critical German guideline for determining tolerances for plastic moulded parts, and the TG5 (Tolerance Group 5) Assuming you mean the German standard DIN 16742