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+49 8053 2029-0Behind ultra-cromox.com are two family-owned and operated manufacturers who share the same priorities: engineering depth, consistent quality, and products built for real-world use on the water. Together, they bring more than 125 years of combined experience in development and manufacturing.
Two originals define this partnership: the ULTRA Anchor and the cromox® chain. Both stand for proven performance and dependable materials. Choose the trusted original and avoid counterfeit products.
Product development timeline
1948
Foundation of Ketten Wälder GmbH: production of agricultural chains and construction of the first production hall
1950
Expansion of the machinery, start of mechanized chain production
1965
Automated production of round-link steel chain
1977
H33 certification by the employers' liability insurance association
1978
Boyut Mechanical Industry founded (stainless-steel machine parts)
1980
Relocation to the new, spacious company building
1981
Official opening ceremony
1985
Extension of machine park
1995
Start of the first stainless steel product range
2000
Start of marine product development with a stainless-steel rope storage concept, which led to the ULTRALINE Reel
2001
Introduction of numerous new products, including development of the INOX product range
Late 2003 - 2005
Design, testing, and release of the patented ULTRA Anchor to the Turkish market
2005
The original ULTRA anchor
2006
The ULTRA Anchor was included in an anchor test by Segeln and was reported to set instantly with strong holding power
2008
Expansion of the production and storage area to over 5,000 m² and registration of the brand cromox®
2010
Further product development by the founders
2013
Brand naming evolved to ULTRA Marine as ULTRA-branded products became more widely known than Boyut Marine
2016
In addition to annual investments in machinery, acquisition of state-of-the-art 5-axis machining centers (in the course of automation of production processes)
2018
Foundation of the independent subsidiary cromox® US, Inc.
2021
Process automation: new implementation and expansion of the ERP system infrastructure
2024
Construction of a modernised and larger company building
2025
Substantial investment in state-of-the-art production equipment
2025
Brand naming evolved to ULTRA Products to better highlight their product brand "ULTRA"
2026
cromox® joined ULTRA Products as distributor in Europe
Ketten Wälder GmbH · cromox®
Nothing is more constant than change
As with a lot of other companies, since its inception, Ketten Wälder GmbH has undergone numerous changes in order to meet the product and quality requirements of its ever-growing client base. While our customers mainly required agricultural chains in the early days, today we are able to offer customised, stainless, acid-resistant product solutions of the highest quality. In 1950, we replaced traditional, manual chain forging over an open fire with our first automatic production line.
Since then, our product range has been continuously adapted and developed to reflect current market developments, including globalisation. This has allowed us always to be able to meet the demands of our customers and to show them new, improved options.
In 1995, our product portfolio was significantly expanded to include stainless steel chains in our product range.
Regular investments, innovations and development ideas have enabled us to improve the diversity and technical specification of our range on a constant basis. In 2008, this culminated in the successful launch of our own cromox® brand, which has since represented the highest quality in stainless steel.
We have confidence in our cromox® product range and are 100% convinced of its reliability. Nonetheless, we strive continuously to improve our performance and our products for our customers.
We live the progress.
Franz Maximilian Wälder
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