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303 - Materials - Technical
Hobby and Engineering Supplies

303 Stainless Steel

Similar Grades
A1
Euronorm No. 1.4305
Euronorm Name X8CrNiS189
JIS SUS303
BS 303S31
UNS S30300
En 58M SS 2346

HES 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 Hobby and Engineering Supplies 303 Stainless Online Catalogue pages.


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

The Small Parts and Bearings has a much larger range of engineering supplies.

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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Hobby and Engineering Supplies offers 2322 products in 232 categories including spare parts for remote control cars, assortment kits, kites, styrene, depron, ceramic and ceramic hybrid bearings, bearings, tools, belts and adhesives - see the full listing in the Online Catalogue. We have excellent Freight Rates within Australia and worldwide. We offer a choice of delivery with a signature required, or cheaper options with no signature required. The no signature required options are at the customer’s risk once the goods leave our store.

Using the links throughout this site you will find extensive information including catalogues, technical data, and other product specific information. We sell our products worldwide through our online store and our overseas freight rates are competitive for fully traceable courier delivery.

Hobby and Engineering Supplies is part of MBA Group offering a select range from the MBA Group catalogue.

Hobby and Engineering Supplies products are not authorised for sale into the USA or Canada due to the reluctance of Australian insurers to provide product liability insurance into those two countries.

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