High strength and corrosion resistance for large-diameter bolting
BUMAX NITRO 109 is the optimal solution for large-diameter high-strength bolting applications in the marine and offshore markets, and other applications that require large fasteners with excellent corrosion resistance and high-strength properties. The grade provides a strength class equivalent to 10.9 at large diameters up to M36 and even strength class 100 in M42 diameters.
These enhanced properties are achieved through nitrogen addition, which is an effective way of strengthening austenitic stainless steels while maintaining material properties. BUMAX NITRO 109 can potentially replace more expensive nickel-based alloy fasteners, which is a common option used for corrosion-resistant fastening in large diameter and structural bolting applications.
Get in touch with an expert
Discuss more complex requirements with our technical team
Stainless steel fasteners with enhanced properties

BUMAX NITRO 109 fasteners excel in terms of:
Corrosion resistance
High strength
Ductility
Fatigue resistance
Magnetic permeability
These enhanced properties are achieved by using premium nitronic stainless steel grade that is produced to stringent BUMAX specifications by the highest quality European steel mills. Our expert fastener manufacturing processes ensure a high-performance product that is extremely reliable.

Fasteners for demanding applications
BUMAX NITRO 109 fasteners are used in marine and offshore, and other applications that require large fasteners with excellent corrosion resistance and high strength.
Standards
- UNS: S20910
Order BUMAX® Nitro 109
BUMAX NITRO 109 is available as a manufactured-to-order product. Contact us to find out how BUMAX NITRO 109 fasteners can benefit your applications.