DIN EN ISO 9001: certified since 1994
DIN EN ISO 50001:2011: certified since 2016
DNV: Type Approval in accordance with 2.7-1 (Offshore Containers) since 1999,
DGUV (formerly BG): JDT was issued with the H3 stamp in the 1960s as the first manufacturer of slinging chains. In 2008 BG confirmed the high quality of the standard 10 (ENORM) for slinging gear as part of a license. As a consistent further development, grade 12 (MAXNORM) was then certified in 2014 by the DGUV test, organised by the testing and certification body for surface technology and lifting equipment (wood and metal department) with D3-stamp.
DEKRA:As the first manufacturer of short link chains, JDT was awarded the DEKRA δ119 seal for its wide range of products. The use of the seal reflects the conformity of JDT products with the high requirements of existing national and international standards. DEKRA, as an internationally recognised testing institute and the high test criteria associated with it once again underlines JDT's awareness of quality, as well as the responsibility we have towards our customers.

Quality must meet the highest requirements. Our quality standards are therefore geared towards our customers’ expectations and ideas. The result is a quality management system that has been consistently lived for years, and which was certified in accordance with ISO 9001 as early as 1994.

Thanks to modern preventative quality assurance methods and tools, we avoid faults before they occur.

The JDT production quality is licensed and confirmed on an ongoing basis by our customers and by external acceptance organisations, including

• In the industry sector in the case of slinging chains and accessories of goods class 8 and 10 (ENORM) by the worldwide recognised licensing of the trade association (BG)
• For slinging gear for offshore containers by way of a DNV license

Thanks to its long-standing experience, JDT is able to collaborate in the standardisation committee for round steel chains (NRK).
This standardisation committee is responsible for the national (DIN), European (CEN) and international standardisation (ISO) in respect of round steel chains (round steel chains for general purposes, slinging gear, lifting chains, conveyor chains, anti-skid chains and seizing chains) , including the accessories.
Among others, JDT has taken the lead on defining the requirements for high-strength chains of the grade 10 (PAS 1061).

In the mining standardisation committee (FABERG) JDT collaborates on specifying the worldwide acknowledged standard for mining chains (e.g. DIN 22255) and locks (e.g. DIN 22258).
In the iron and steel standardisation committee (FES) JDT incorporates its long-standing experience in respect of developing and using modern high-performance materials for standardising chain steels (DIN 17115).