303 - Materials - Technical

303 Stainless Steel

Similar Grades
Euronorm No. 1.4305
Euronorm Name X8CrNiS189
BS 303S31
UNS S30300
En 58M SS 2346

SPB Products made from this material
Clevis Pins, Collars, Couplings, Dowel Pins, Gears, Screws, Shafting, Shoulder Screws, Springs

303 is an austenitic stainless steel, slightly magnetic and very corrosion resistant. 303 is a free-machining stainless steel. The free-machining characteristics are provided by adding sulphur and/or selenium. Using 303 stainless steel can be more cost effective than using other stainless steels since 303 takes less time to machine, machine tool bits will last longer. 303 is similar to 304 grade (A2 or 18/8) but is easier to machine.

Maximum Brinell Hardness (HB) is 262.

The main component of the steel is Fe (Iron) with the addition of the elements shown in the following chart

Max. % Chemical Composition
C Si Mn P S Cr Mo Ni
0.1 1.0 2.0 0.2 0.15 17.0 to 19.0 - 8.0 to 10.0

For better corrosion resistance but lower machinability see 304 Grade

For higher resistance to pitting and crevice corrosion in chloride environments but lower machinability see 316 Grade

For better machinability but lower corrosion resistance, or if hardening by heat treatment is required see 416 Grade

You can find 303 Stainless items in the Small Parts and Bearings 303 Stainless Online Catalogue pages.

For a huge range of bearings online please visit the Bearing Shop Online Website.

Hobby and Engineering Supplies lists a smaller range of products and only the most popular items in each range. They also list many additional hobby specific categories.

For the best range of miniature and small bearings please try the Miniature Bearings Australia website. Miniature Bearings Australia also list a large variety of miniature engineering products.

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