HobbyParts 21 - Skate - Hobby Information

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HobbyParts 21 - Skate - Hobby Information

Skate Bearings - Question 21

What is the difference between SUJ2 and SAE52100 bearing steel?

Very little. They are both standards which are applied to the chemical composition of Chrome Steel - also known as Chromium Steel and High Carbon Chrome Steel). SUJ2 is a Japanese standard, whilst SAE52100 is a U.S. standard.

Both of the above standards are exactly the same for 4 of the 7 major elements used in Chrome Steel. Of the remaining 3 elements the specifications overlap. An SUJ2 bearing steel may also conform to SAE52100 and vice versa. That is not to say that all batches of one will also conform to the other, but the differences are minimal anyway. Don't let anyone tell you that one is better than the other.

The main differences are the specifications for Manganese, Carbon and Molybdenum as follows
	Manganese	Carbon	Molybdenum
SUJ2	< 0.50%	0.95-1.10%	<0.08%
SAE52100	0.25-0.45%	0.98-1.10%	<0.10%
As you can see, the differences are minimal, and they overlap considerably

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H.E. Supplies (Hobby Engineering Supplies) offers thousands of products including remote controlled cars, planes, boats, and helicopters. We stock spare parts for remote controlled models. Our range includes the popular Solarbotics solar model kits and spares. We also distribute the full range of miniature engineering products from Miniature Bearings Australia. This range includes small bearings, timing pulleys, timing belts, seals, o-rings, gears and more. Also available from our store in Mansfield Queensland are a full range of lubricants, adhesives, kites, balsa wood and plastic rod and sheet materials. See our Online Catalogue for more information. Our main business is handled from our sales counter and showroom at 186 Wecker Road Mansfield, Queensland, Australia, but we also sell by phone, fax, online and mail order. We offer all of our hobby parts through our online store and some of the more popular MBA items. If you would like to purchase other MBA items online, Small Parts and Bearings offer the full range in their online catalogue.

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