a bunch of metal rings are stacked on top of each other

Martensitic Stainless Steel Fasteners

17-4 PH

17-4 PH stainless steel, designated UNS S17400, is a martensitic precipitation-hardening stainless steel that offers a unique combination of high strength, corrosion resistance, and hardness. Its primary advantage lies in its ability to be heat treated to various strength levels through precipitation hardening, reaching tensile strengths over 200 ksi while maintaining good toughness. Compared to standard austenitic stainless steels, 17-4 PH provides much higher mechanical properties while still delivering resistance to atmospheric corrosion, fresh water, and many chemicals, though it is not as chloride-resistant as 316. It also maintains excellent mechanical strength up to about 600°F (315°C). Because of these qualities, 17-4 PH is widely used across aerospace, defense, petrochemical, nuclear, food processing, and medical industries. In aerospace and defense, it is applied in structural components, turbine blades, and landing gear parts requiring both high strength and reliability. The petrochemical and nuclear sectors use it for valves, shafts, and pumps exposed to moderate corrosion and high stress. The food processing industry employs it for equipment requiring wear resistance and durability. 17-4 PH is also extensively manufactured into fasteners such as bolts, screws, studs, nuts, and washers, which provide exceptional strength, fatigue resistance, and long service life in demanding mechanical and structural assemblies.

Learn More

a picture of chemical composition of 17-4 PH material