Bolting up hot brass parts with cap head screws

[Noitoen]

I remember my science teacher would burn a piece on Magnesium strip that would turn into a white powder, the ingredient of Milk of Magnesia which was supposed to be good for something like constipation

[mikey553]

If anybody wants a magnesium bar stock, the water heater anode may be usable. Not all the anodes are magnesium, but many are. They come in different diameters up to almost 1". They have a small (about 1/8") steel core and threaded cap, but the rest is magnesium. Not sure if it is an alloy or a pure metal.

[Georgineer]

I remember my science teacher would burn a piece on Magnesium strip that would turn into a white powder, the ingredient of Milk of Magnesia which was supposed to be good for something like constipation

Close, but not quite. Burning magnesium in air gives magnesium oxide, MgO. Milk of magnesia is a suspension of magnesium hydroxide, Mg(OH)₂, which can indeed be used to treat constipation.

And, referring to my earlier post, I'm still wondering if there is a reason that brass screws couldn't be used.

George

[J Tiers]

And, referring to my earlier post, I'm still wondering if there is a reason that brass screws couldn't be used.

George

Food processing may mean "wash-down". Brass does not play well with all forms of cleaners, and brass screws might seize up as badly or even worse.

[Noitoen]

Close, but not quite. Burning magnesium in air gives magnesium oxide, MgO. Milk of magnesia is a suspension of magnesium hydroxide, Mg(OH)₂, which can indeed be used to treat constipation.

And, referring to my earlier post, I'm still wondering if there is a reason that brass screws couldn't be used.

George

Magnesium hydroxide is made by mixing/reacting Magnesium oxide with water so, in the end it can be used as ingredient of the milk.

[dr pepper]

Yes incidental contact is allowed.
The screws are steel cap heads, and they are put in at about 10nM, not that tight, but come out much tighter, I think the threads are being deformed due to the expansion differences.
The last one I took out sheared the head of the bolt.
I'm going to try the shnorr washer idea, maybe 4 or 6 spring washers with a thick washer at the top, I had a motorcycle where the exhaust bolted to the ally head like that.

[larry_g]

https://www.westcoastplastics.com/HTML/Watlow-Watlube.php

We used the above on fasteners when attaching heaters to the presses used in our processes. The were heaters that ran in the 800f range and used #10 or 1/4" screws. We tried many different antiseize products and this is what worked. It was made for preventing the heaters from sticking into their holes. I don't think that it is to far removed chemically from milk of magnesia. You'll have to check the MSDS.

lg
no neat sig line

[boslab]

The milk of magnesia thing was common on the blast furnace copper tuyeres, think they use a rocol lithium disulphide now, I’d try a titanium screw with copperslip myself ( works on injection moulding nozzles apparently,) a call to rocol or locktite technical might be useful, they are helpful as I think they get bored myself!
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