Technical Cleanliness in C-Parts

Cleanliness Throughout the Entire Manufacturing, Delivery, and Assembly Process

Technical cleanliness plays an increasingly important role in industrial manufacturing and has gained significant attention in recent years. As individual components become more complex, they also become more sensitive and prone to malfunctions. Even the smallest contaminants can lead to the failure of single parts or entire assemblies. For this reason, entire systems are now frequently assembled under cleanroom conditions.

It’s not only the environmental conditions during assembly that are critical — technical cleanliness must be ensured throughout the entire manufacturing process. This includes reliable, contaminant-free C-parts that meet high cleanliness standards. As a result, cleanliness requirements are rising not only for individual components but also for fasteners and connecting elements used during assembly.

By working with external service providers and using state-of-the-art equipment and analysis technologies, we are able to supply our customers with fastening elements that meet their specific cleanliness requirements — delivered as needed, directly to the workstation.


Our Services Include:

  • Cleaning of fasteners through the selection of appropriate extraction and analysis methods
  • Gravimetric determination of residual contamination
  • Microscopic particle count and classification according to ISO 16232 / VDA 19 or according to individual company specifications
  • Differentiation between metallic and non-metallic particles
  • Documentation and archiving of test results
  • Additional laboratory analyses upon request
  • Determination of surface tension and quality testing using the ink test

Cleanability-Oriented Design of C-Parts

Technical cleanliness begins as early as the production of the screw, as both surface coating and geometry influence the risk of contamination. Smooth surfaces accumulate less dirt than porous ones, and edges and corners make subsequent cleaning more difficult. Accordingly, for customers with cleanroom production, we ensure cleanability-oriented design of fasteners by selecting appropriate surface finishes and suitable component geometries.

Technical Cleanliness in the Manufacturing Process

The production process of fastening elements itself is also subject to strict monitoring. Key parameters include, for example, the condition and geometry of tools, the use of cooling and lubricating fluids, and integrated flushing processes — all of which influence the final cleanliness of screws and nuts.

To remove particles generated during production and to verify the residual contamination levels, the fasteners are flushed, shaken, sprayed, or treated with ultrasound. The cleaning method depends on customer requirements and the intended application. Using a decay curve, the parameters for future cleaning processes are validated and documented.

Packaging Requirements for Technically Clean Fasteners

An essential factor for the cleanliness of parts is also their packaging and transportation. To ensure that the products arrive in perfect condition at our logistics center and subsequently in our customers’ production lines, we work closely with our partners to provide packaging tailored to the specific articles, meeting the requirements of technical cleanliness.

We use packaging materials customized to our customers’ needs or products from the Würth portfolio, including single or special packaging (blister packs, small load carriers (KLT), polybags), vacuum packaging, sorting, counting, weighing, demagnetizing, corrosion protection, returnable packaging management, logistics, and direct shipping.

Packaging Requirements for Technically Clean Fasteners
Technical Cleanliness: Logistics

Separate Logistics Area for the Storage of Technically Clean Parts

Technically clean C-parts are stored in a dedicated area within our logistics center, where specially trained personnel ensure technical cleanliness is maintained throughout the picking process. Complete traceability of all items is guaranteed through clear batch labeling on every part.


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