Din 267 Part 9 Pdf =link=
The standard mandates that fasteners with high tensile strength—typically property classes 10.9 and 12.9, or fasteners with a hardness above 320 HV—must undergo a baking (hydrogen de-embrittlement) process. This involves heating the parts to a specific temperature (usually between 180°C and 220°C) for a designated duration immediately after plating to drive out the trapped hydrogen. Testing and Quality Assurance
The baking process must begin as soon as possible, typically within 4 hours after electroplating, to effectively drive out the hydrogen before it causes micro-cracking. 4. Coating Designations and Coding System
It ensures that the plated thread does not exceed the zero-line (the maximum material limit of the standard thread class, usually 6g for bolts and 6H for nuts). 2. Hydrogen Embrittlement Risks
The standard identified as the main characteristic of electroplated products. This focus on thickness was practical: plating thickness directly affects both corrosion protection and thread fit. The standard detailed thickness specifications and testing protocols to ensure consistency across different manufacturers. din 267 part 9 pdf
The content of DIN 267 Part 9 was migrated and split into two modern, globally recognized standards:
When you review a DIN 267 Part 9 document, the technical specifications generally cover four critical areas: 1. Dimensional Tolerances and Thread Fit
is a standard that outlines the technical delivery conditions for mechanical fasteners with electroplated coatings , primarily focusing on bolts, screws, and nuts . It provides essential specifications for layer thickness, thread tolerances after plating, and testing methods to ensure fasteners maintain their mechanical integrity while gaining corrosion resistance . Key Technical Specifications The standard mandates that fasteners with high tensile
When specifying a fastener coated according to DIN 267 Part 9, a standardized coding system is used in engineering drawings and purchase orders. The code generally consists of a surface protection symbol detailing the coating metal and the minimum layer thickness. A2F A: Zinc coating. 2: Minimum coating thickness of 5 µm. F: Passivation style (e.g., iridescent yellow).
The standard typically offers a range of coating thicknesses, such as 2, 5, 8, or 12 μ m depending on the corrosion resistance required. Can I still use DIN 267-9 for new designs?
The passivation or chromate conversion coating type (e.g., clear, yellow, olive drab, or black). 3. Hydrogen Embrittlement Risks Hydrogen Embrittlement Risks The standard identified as the
The baking typically occurs at temperatures between 200°C and 220°C for a duration ranging from 2 to 24 hours, depending on the material's property class and dimensions.
: It has been largely replaced by international standards, specifically DIN EN ISO 4042 Compatibility
Corrosion of the base steel substrate, indicating coating failure.