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Old 10-20-2013, 10:18 AM
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Thread cutting oil for stainless steel?

Still working on this project. I have ordered a new rod of 1/2" 303 stainless ans the only American made cutting die I could find (Irwin). Everything I have read says to use a good cutting oil for stainless and many recommend Rigid Extreme Performance-but i can only find that in gallons and I only need to cut two 2" long thread portions.

Any suggestions for a less expensive but successful substitute will be greatly appreciated.

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Old 10-20-2013, 11:23 AM
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Quote:
Originally Posted by 5window View Post
Still working on this project. I have ordered a new rod of 1/2" 303 stainless ans the only American made cutting die I could find (Irwin). Everything I have read says to use a good cutting oil for stainless and many recommend Rigid Extreme Performance-but i can only find that in gallons and I only need to cut two 2" long thread portions.

Any suggestions for a less expensive but successful substitute will be greatly appreciated.
I have not tried it on stainless but you might try brake fluid. It works great on steel. If you have some extra stock, give it a try and let us know how it works.
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Old 10-20-2013, 11:35 AM
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this should work for you

Oatey 32 oz. Dark Cutting Oil-30204 at The Home Depot
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Old 10-20-2013, 12:50 PM
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If the thread dies aren't made for cutting SS, then it will be a pain, regardless of what oil you use. I'm sure for the few you are doing a carbide threading die will work, but it will take it's toll on the die. The thicker your lube is, the easier it will cut. Believe it or not, but the old timers in machine shops used to use Crisco shortening on their material while cutting SS. I watched an old timer cutting this way on a machine many years ago, using a brush applying it as the tool turned.
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Old 10-20-2013, 01:04 PM
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This is what we use at work. Awesome stuff! This makes a huge difference in the quality of threads your die will cut.

I believe it's the moly that makes the difference between this and other cutting fluids.

Castrol Moly Dee

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Moly Dee CF Tapping Fluid is a premium, high-performance tapping oil that has been specifically designed for challenging applications. It is formulated for use on ferrous and stainless steel materials and it provides the lubrication needed to perform in applications where part tolerances are low and surface finish requirements are high.
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Old 10-20-2013, 02:19 PM
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Originally Posted by 1971BB427 View Post
If the thread dies aren't made for cutting SS, then it will be a pain, regardless of what oil you use. I'm sure for the few you are doing a carbide threading die will work, but it will take it's toll on the die. The thicker your lube is, the easier it will cut. Believe it or not, but the old timers in machine shops used to use Crisco shortening on their material while cutting SS. I watched an old timer cutting this way on a machine many years ago, using a brush applying it as the tool turned.

and you can bake biscuits on the other side at the same time. sounds like a neat trick in a pinch. worth a try .

Last edited by killeratrod; 10-20-2013 at 02:32 PM.
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Old 10-20-2013, 02:22 PM
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Good to know - I'll file this in my memory. I haven't had to cut many threads in stainless - mostly just thread-chasing, but I will sometime. Thanks for the info.
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Old 01-07-2014, 03:08 PM
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Can't remember the name but it is green in color and more like a paste. Try a machine shop supply store. Whatever you get make sure it does not have sulfur in it.
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Old 01-07-2014, 05:43 PM
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Best thing I've found to cut threads in stainless is ..... never seize .. yep , the grey stuff , works great !!
dave
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