Special fasteners for the onshore and offshore market

If you have questions like:
– Where can I find slewing ring studs as quickly as possible?
– Which supplier has this type of fasteners in 30CrNiMo8V steel?
– And do they comply with EN-10204 type 3.2?

To all these questions and more, you will get a swift and reliable answer from MARO Fasteners. As specialists in the on- & offshore market we can respond effectively to your wishes as our customer.


Our range of fasteners aim for the heavy industry, the shipping industry, the crane industry, wind turbines, pipelines and mechanical engineering. We are your partner for new projects and also for repair work.

That is why customers from several different countries find their way to MARO Fasteners for thorough advice and the products they need. We guarantee a fast and accurate delivery. A delivery according to technical specifications provided and in accordance with current quality standards, guaranteed by the various certificates we hold. Our specialists will answer every question to your full satisfaction.


  • Hexagon Bolts, Nuts, Washers
  • Studbolts ASTM/ ASME
  • Socket cap, Countersunk, Setscrews
  • Tensionbolts
  • Slew bearing studs
  • Engineering- Double ended studs
  • Hexagon Nyloc Nuts DIN 985
  • Disc Springs DIN 2093A
  • Spherical washers DIN 6319C
  • Conical seats DIN 6319D + G
  • Machined parts
  • Fasteners according to customer drawing


  • Special grades of Stainless Steel
  • Standard Stainless Steel: A2, A4                         (class 50, 70, 80, 100)
  • Steel: 4.6, 5.6, 6.8, 8.8, 10.9, 12.9
  • Duplex 1.4462 – UNS 31803
  • Super Duplex 1.4501 – UNS 32760
  • Titanium, Hastelloy,
  • Monel, Nimonic, Inconel,
  • Brass, Incoloy, Aluminium
  • Bronze
  • 254SMO
  • ASTM A453 GRADE 660
  • 42CrMo4 -1.7225
  • 34CrNiMo6V – 1.6582
  • 30CrNiMo8V – 1.6580
  • 24CrMo5 – 1.7258
  • 21CrMoV57 – 1.7709


  • Hot Dipped Galvanized
  • Electro Zinc Alloy Platings
  • Zinc-Flake coatings
  • Fluoropolymer coatings (PTFE)


EN-10204 type 3.1, 3.2.

Inspection bodies

DNV, LIoyd’s Register of Shipping, ABS, TÜV, Germanischer LIoyd’s, Bureau Veritas, etc.