Din 267 Part 9 Pdf

Specifies the number of hours the coating must withstand a standard neutral salt spray test (DIN EN ISO 9227) before white rust (zinc corrosion) or red rust (base metal corrosion) appears. Modern Status: DIN 267 Part 9 vs. ISO 4042

An important provision in DIN 267 Part 9 addressed . The standard specified that basic coating thickness and thread tolerances must comply with DIN 13, which covers ISO metric screw threads. This ensured that electroplated fasteners would still assemble properly with corresponding nuts or threaded holes despite the additional layer of metal.

Minor superficial marks from manufacturing handling are allowed, provided they do not compromise the dimensional tolerances or functional performance. Inspection and Testing Methodologies

Minimizing the risk of hydrogen embrittlement in high-strength fasteners. Specifying testing procedures for quality assurance. Thread Tolerances and Coating Thickness din 267 part 9 pdf

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The standard noted that small components with spring-like characteristics, when exceeding , faced significantly higher hydrogen embrittlement risk and required careful attention to material selection, heat treatment, and surface processing.

: The "zero line" is the theoretical boundary of a thread. If a coating is too thick, the bolt won't fit into the nut. DIN 267-9 mandates that the coating must not push the bolt thread beyond this limit. Harmonization Specifies the number of hours the coating must

Ensures that the coating thickness does not cause the thread to exceed its zero line (maximum material limit), which would prevent proper assembly. Designation Code System: Uses a code (e.g., A2K) to describe the coating: First Letter: The coating metal (e.g., A for Zinc). The minimum layer thickness (e.g., 2 for Second Letter:

Magnetic methods (ISO 2178) or microscopic cross-sectioning (ISO 1463) to verify local and average coating thickness.

: It establishes that electroplated coatings must not cause the zero line (theoretical limit) of the thread to be exceeded for bolts or not attained for nuts. Designation System The standard specified that basic coating thickness and

Fasteners with a surface hardness exceeding (Vickers Hardness) or 31 HRC (Rockwell Hardness). Preventive Measures

Like many German national standards, DIN 267 Part 9 was eventually replaced by an international equivalent. The standard was , when it was fully replaced by ISO 4042:1999 and its European adoption.