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 Connecting a quartz tube to a stainless steel tube
Author: prakashdg (NY)

Hi all

I would like to have a gas tight connection between a 1 cm Outer Dia hollow quartz tube and a stainless steel gas line. I have worked with such a connection before but do not know the name of it. I remember there being a knurled adapter which can be rotated to clamp an O-Ring / Viton seal around the quartz tube, with the other end of this knurled connector having threads that mate with the stainless steel gas line. I have briefly tried searching for the name of this thing but am having trouble being able to find it.

Any help would be really appreciated, thank you

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 Re: Connecting a quartz tube to a stainless steel tube
Author: george 7941

Round cross-section O-rings are not usually compressed with a nut. They do their job in their normal relaxed state except for the slight compression arising from the snug fit between the o-ring and the parts being sealed.

Are you sure about the knurled adaptor compressing the o-ring? The nut might be holding the parts together, preventing them from blowing apart, but I doubt it was compressing the o-ring.

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 Re: Connecting a quartz tube to a stainless steel tube
Author: prakashdg (NY)

Actually, I am not sure that the part that does the sealing is an O-ring. I only remember having to tighten it like a screw (with the knurl) to get the seal. I just assumed that there was a compressible part inside and mentioned it was an O-ring.

So essentially, one end of the adapter had the compressible part within the knurl, and the other end has a normal female or male (not sure as there were like 4 or 5 adpaters till the final connection to the S.S. gas line) threaded end that eventually mated with the gas line connection.

I inquired about this to a company and they said that I would have to fuse their adapter to the mouth of the quartz tube, which I would prefer not to do if possible

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 Re: Connecting a quartz tube to a stainless steel tube
Author: packy (MA)

are you asking about a fitting similar to this ?
[www.essentialhardware.com]



Edited 1 times.

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 Re: Connecting a quartz tube to a stainless steel tube
Author: prakashdg (NY)

I believe so, but not sure that that hose clamp end wont break the quartz.

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