Anti-Seize compound for stainless steel screws

[tmech77]

I am working on a very old assembly that has a stainless steel fasteners. I will be working on the equipment and then will be putting in new stainless steel screws and nuts. The notes on the old assembly drawing specified "Apply anti-seize compound GA-9289, Type 2, to threads". I need to work on the assembly and use the same anti-seize, however I could not find exactly what is specified. The best I could come up with was that Loctite Copper C5-A was the same as 9289. However, it does not address the "TYPE 2" requirement. I am thinking that maybe the 9289 is a copper based compound and the "Type 2" is maybe a Nickel based compound. Does anyone know? Is it OK to use a copper based anti-seize on stainless steel #10-32 screws with nuts? The environment is controlled in doors 72 degrees F.

 

[3DDave]

It is interesting that GA-9289 doesn't show up for me via Google. How old is this drawing and what is it an assembly for? It seems possible that it's an individual company internal spec, but you say you have linked it to C5-A. I dunno - If it was a Loctite product their product support guys would know - perhaps you already called them.

 

[RossABQ]

There is also an old FelPro #N-1000 Nuclear grade copper anti-seize with graphite added. Loctite apparently makes it nowadays. The "Type 2" may refer to the graphite?

 

[Jughandle]

Your last sentence contains the really really good news; plus you say there will be new SS screws and nuts. (Based on that, there is no apparent need for an anti-seize compound.) These are typically silicone grease, graphite and a powdered metal. Check the mfg recommendations of course for material compatibility, but in this case, whether its Cu or Ni, I think its mox-nix!

 

[21121956]

Hello everybody:

I hope I am not out of topic but, anyway here are my two cents. Please take a look to these sources:

“Mechanical Properties and Corrosion Behavior of Stainless Steels for Locks, Dams, and Hydroelectric Plant Applications”, by Ashok Kumar & Ali A. Odeh, US Army Corps of Engineers, 1989.

http://www.dtic.mil/dtic/tr/fulltext/u2/a219490.pdf.

thread725-366641
thread725-18693.

El que no puede andar, se sienta.

 

[tbuelna]

What is the specific cres alloy the 10-32 screws and nuts are made from?

If you can't obtain the specific anti-seize compound noted, then for the conditions described I would use a spray-on moly-disulfide dry film on the screw threads. Much cleaner than a copper or nickel paste and will stay in place over a longer period of time.

 

[Tmoose]

" The environment is controlled in doors 72 degrees F."
"(Based on that, there is no apparent need for an anti-seize compound.)"

I'd say, Depending on the SS alloys, and applied torque, aggressive and destructive galling can happen in a temperature controlled precision spindle assembly clean room.

 

[gruntguru]

Caution re silicon grease. Silicon can increase the incidence of galling in SS threads.

je suis charlie

 

[israelkk]

What type of seals you use for the 200000psi pressure?

 

[WKTaylor]

In aerospace we specify 'specification' anti-seize compounds, such as...

MIL-PRF-907 ANTISEIZE THREAD COMPOUND, HIGH TEMPERATURE
A-A-59313 THREAD COMPOUND; ANTISEIZE, ZINC DUST-PETROLATUM
MIL-PRF-83483 ANTISEIZE THREAD COMPOUND, MOLYBDENUM DISULFIDE-PETROLATUM

Henkel-Loctite and Bostik make reliable antiseize compounds for use on various metals, including high nickel alloy bolt/nuts, which are spec-qualified [see their web sites for recommendations] .

Regards, Wil Taylor

o Trust - But Verify!
o We believe to be true what we prefer to be true.
o For those who believe, no proof is required; for those who cannot believe, no proof is possible.
o Unfortunately, in science what You 'believe' is irrelevant. ["Orion"]
o Learn the rules like a pro, so you can break them like an artist. [Picasso]

 

[tbuelna]

wktaylor-

I don't recall ever seeing anti-seize compounds called out when installing 10-32 cres screws/nuts in aerospace applications. The nuts used (such as MS21043) typically came with some form of anti-seize coating such as silver plating or moly-disulfide DFL. The problem with using the type of anti-seize compounds described is that they are very messy.

Screws and nuts made from austenitic stainless such as 304 or 316 will readily gall/seize. But using a better quality stainless alloy like A286 for the fasteners will greatly reduce the potential for galling/seizing.

 

[Tmoose]

I would not lose track of the fact those old timers specified the use of some kind of antiseize.
My first suspicion is they did so as the result of problems, although perhaps as a carry over from other products or projects.
Yes, it is a shame to carry forward rituals "just because."
But ........... I'd undertake some carefully orchestrated tests before abandoning the rabbit's foot.

Are there also specs for the nut and bolt SS materials they used back then?

 

[MikeHalloran]

On a 10-32 screw, just a microliter or two of anti-seize is probably sufficient.
Dispensing it from a syringe minimizes the mess.

Silver plating works once, maybe, if you are lucky.


Mike Halloran
Pembroke Pines, FL, USA