[TheForge] Re: Timken Case Hardening

[Lon Humphrey]

nea...most of the bigger ones made today are some form of stainless thats 
why they wont rust...only if it rusts is it 52100

----- Original Message ----- 
From: "David E. Smucker" <davesmucker at hotmail.com>
To: <munlaw2 at hcsmail.com>; "Sponsored by ABANA" <theforge at mailman.qth.net>
Sent: Thursday, March 20, 2008 11:50 AM
Subject: Re: [TheForge] Re: Timken Case Hardening


> Almost all ball bearings are 52100.  Many ball and roller bearings by SKF, 
> Torrington, FAG are also 52100.  SKF and FAG may make some of their very 
> large bearings using case hardening.  I would think the same is true for 
> the Japanese bearing manufactures but I have no first hand knowledge. 
> Timken as it turns out makes most of the steel for a wide range of 
> manufacturers.  For Timken's own bearings they to the best of my knowledge 
> have all been case hardened.
>
> That doesn't mean that the Timken bearings are not good for making tools, 
> they are.  If forged down the outer layer is still high carbon steel 
> unless you grind it off because the case is so deep.  The inside is like a 
> 4120, very tough and strong.
>
> But keep in mind and this is a BIG BUT -- like all things made from 
> "scrap" they may fail because of defects from the parts service life.  For 
> some, this is OK, but others may not want to risk it.
>
> Dave Smucker
> ----- Original Message ----- 
> From: "Ron Childers" <munlaw2 at hcsmail.com>
> To: "'Sponsored by ABANA'" <theforge at mailman.qth.net>
> Sent: Thursday, March 20, 2008 9:48 AM
> Subject: RE: [TheForge] Re: Timken Case Hardening
>
>
>> Some years ago I made a big knife out of an old axel bearing from a semi. 
>> I
>> was told it was 52100 and I tempered in oil. It chopped through a 2x4 and
>> would still shave, so it must have been pretty good steel. Also made some
>> smaller blades out of car axel bearings and big ball bearings; same 
>> story.
>>
>> It must have been dumb luck that the bearings weren't Timpkin. Which
>> manufacturers use 52100 for their bearings? Machinery's Handbook must 
>> have
>> contacted Monmoth, Fag, or some other company for their information on
>> bearing steels.
>>
>> Ron C
>>
>>
>>
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