Ferdinand Gross supplies Deutsche Bahn with spring bolts that may only be delivered after successful completion of the manufacturer-related Product Qualification Rail Vehicle Parts (HPQ) test by DB engineers. This stringent test ensures a high standard of quality, especially as the products supplied are used in safety-relevant applications. The HPQ test was recently carried out, in which both Ferdinand Gross and the manufacturer Mohindra achieved outstanding results. Subsequently, delivery approval was granted for the next three years, underlining the continued high quality and safety of the products supplied.