Nitronic 60 CRES threaded inserts

[tmech77]

Has anyone used Nitronic 60 CRES keylock threaded inserts? If so, did you use them with stainless steel screws? Did you have any problems with galling? I was planning on using them with both #6-32 and #8-32 stainless steel screws. The screws would need to be removed and replaced about once a year over the next 30 years. We never use anti-seize compound and if I order the insert with dry film lube it seems like it may take longer to get. I could possibly use zinc plated steel inserts with the stainless steel screws unless that would be bad considering galvanic corrosion from dissimillar metals. The environment is room temp and humidity controlled not close to any water. Thanks for your help.

 

[tbuelna]

Do the the inserts have an internal locking feature?

With small fastener sizes like #6 or #8, key-locked or ring-locked thread inserts are the most reliable types. The solid wall construction that they have results in a more accurate internal thread shape after installation than other types of inserts like helicoils.

 

[CoryPad]

Nitronic 60 is more resistant to galling compared to other austenitic stainless steels. However, it is best practice to use a lubricant, especially if the mating screw is an austenitic stainless steel like type 304 or 316.

I recommend that you have the screws coated with a dry film lubricant. If they go bad, you can replace the screw much easier than the insert.

 

[ctopher]

I have used Nitronic 60 on external threads, then 304 on internal.
I agree with CoryPad, lubricants are a must. I have tried dry film lubricants and other anti-seize compounds. I found different ones work depending on environment.

Chris, CSWA
SolidWorks 14
ctopher's home
SolidWorks Legion

 

[tmech77]

Thanks to all for the info. The inserts are not going to be the locking variety. Since our environment is very controlled I am now thinking of maybe just using black phosphated steel inserts and zinc plated steel screws. The inserts would be going into an aluminum alloy, maybe 6061 and the screws would be going up against a 5052-H32 aluminum panel. I don't think galvanic corrosion should occur, since the indoor humidity is controlled. What do you think?

 

[ctopher]

Maybe look into Helical "coated" inserts in the alum.

Chris, CSWA
SolidWorks 14
ctopher's home
SolidWorks Legion

 

[tmech77]

Thanks that sounds like a good option.