Din 8570 B -

It applies only to the preparation before welding. The final weld bead profile is governed by other standards (e.g., ISO 5817).

In many European engineering contracts (particularly in automotive and pressure vessel construction), citing "DIN 8570 B" without specifying a class is insufficient. A proper specification might read: "Weld seam preparation to DIN 8570-B Class 3." This becomes a binding quality requirement. din 8570 b

DIN 8570-B2 ≈ ISO 5817 Grade C (medium). DIN 8570-B1 ≈ slightly looser than ISO 5817 Grade B (strict) except for undercut. It applies only to the preparation before welding

While DIN 8570 covers the external dimensions, these chucks typically utilize keyless or keyed jaws. High-quality DIN 8570 B chucks often feature precision-ground jaws that grip the drill bit shank uniformly. A proper specification might read: "Weld seam preparation

: Every welded joint and cut length on that piece must fall within the grade B range unless otherwise specified. Inspection