Stainless Steel 303 is an alloy in the stainless steel family and is also referred to as AISI 303. This grade is especially known for its machinability and free-cutting performance. It is an 18-8 type stainless steel containing iron, chromium and nickel.

The main features of Stainless Steel 303 are:

Machinability: Thanks to its free-cutting properties, AISI 303 can be shaped easily in turning, milling and other machining processes. For this reason, it is often preferred in component manufacturing and machining industries.

Corrosion Resistance: Stainless Steel 303 generally offers good corrosion resistance because of its stainless steel class, although this resistance is lower than in some other stainless steel grades.

Magnetic Properties: AISI 303 is generally magnetic, meaning it can be attracted by a magnet due to its iron content.

Applications: AISI 303 is commonly used in the production of screws, bolts, nuts, shafts and other machined parts. It is especially suitable for precision components and fastening elements used in machinery.

Typical Uses:
Bolts, nuts and screws
Couplings and shafting
Aircraft fasteners
Electrical threaded components
Gears
Machine parts with high machining allowance in corrosive environments suitable for 303

However, the high machinability of AISI 303 can lead to undesirable grain growth at elevated temperatures, so it should not be used in high-temperature applications. For machined parts that require stronger corrosion resistance, more corrosion-resistant stainless steel grades may be preferred.