Types of column nuts for GC notched/not notched

[MSCHemist]

I have a quick question on the capillary column nuts and ferrules. I have two types of column nuts. I have simple hedagonal wrench flat one that I use on the inlets for all my GC's and then I have one that has two wrench flats separated by a round valley in between them. I have that attached to my FID inlet on my 5890 with a 5181-3323 graphite vespel ferrule. Is that correct?

I have yet another that has a notch through the wrench flats.

What are the differences and what are each used for?

[MSCHemist]

nevermind Agilent says the regular one is for short ferrules and the notched ones are for long ferrules like the graphite vespel ones used for MSD.

[dblux_]

nevermind Agilent says the regular one is for short ferrules and the notched ones are for long ferrules like the graphite vespel ones used for MSD.

BTW - Restek equivalent for use with short Agilent-style ferrules is notched (P/N 2184), and the other type for use with standard 1/16" ferrules is not notched (P/N 20883).

[Bigbear]

Be carefull. We have had nothing but bad luck mixing ferrules and nuts from different suppliers. Match like to like, IE if using Agilent use all Agilent..

[dblux_]

Be carefull. We have had nothing but bad luck mixing ferrules and nuts from different suppliers. Match like to like, IE if using Agilent use all Agilent..

Impossible if have to buy in tender procedures. Lowest price wins.
Even if you specify Agilent catalog part number, phrase "or equivalent" must accompany. That's a law of tenders. Luckily non Agilent parts must be really equivalent to Agilent items. And as such Restek always describes them as equivalents in catalogue. So far I have no (serious) reasons to comply.