Coating Hot Dip Galvanized bolts with Teflon
Coating Hot Dip Galvanized bolts with Teflon
(OP)
Hi Everyone,
Our client has asked us to use Teflon coated UNISTRUT SUDNUT (see attached). Since these STUDNUTS are standard items and are available only as Hot Dip Galvanized, we have decide to get these STUDNUTS as Hot dip galvanized and then get it coated with Teflon (Xylan).
My doubt is that is it a good practise to coat Teflon over Hot dip galvanized bolts.
Also since during Hot dip galvanizing they will already undercut the nut threads , after Teflon coating we will have to undercut the nut further more.Since the Teflon coating will be done at a different supplier how will he know or control the undercut , is there any standard we can refer to.
Appreciate you help
Our client has asked us to use Teflon coated UNISTRUT SUDNUT (see attached). Since these STUDNUTS are standard items and are available only as Hot Dip Galvanized, we have decide to get these STUDNUTS as Hot dip galvanized and then get it coated with Teflon (Xylan).
My doubt is that is it a good practise to coat Teflon over Hot dip galvanized bolts.
Also since during Hot dip galvanizing they will already undercut the nut threads , after Teflon coating we will have to undercut the nut further more.Since the Teflon coating will be done at a different supplier how will he know or control the undercut , is there any standard we can refer to.
Appreciate you help





RE: Coating Hot Dip Galvanized bolts with Teflon
You will have to work with Unistrut, not your local distributor.
RE: Coating Hot Dip Galvanized bolts with Teflon
RE: Coating Hot Dip Galvanized bolts with Teflon
RE: Coating Hot Dip Galvanized bolts with Teflon
RE: Coating Hot Dip Galvanized bolts with Teflon
RE: Coating Hot Dip Galvanized bolts with Teflon
You reply was very helpful, but my doubt is whether TEFLON will adhere to Zinc coated bolt.
RE: Coating Hot Dip Galvanized bolts with Teflon
RE: Coating Hot Dip Galvanized bolts with Teflon
RE: Coating Hot Dip Galvanized bolts with Teflon
RE: Coating Hot Dip Galvanized bolts with Teflon
RE: Coating Hot Dip Galvanized bolts with Teflon
http://www.appliedbolting.com/pdf/Coated_Bolts_and...
http://www.whitfordww.com/pdf/literature/Fastener%...'s%20oil.pdf
RE: Coating Hot Dip Galvanized bolts with Teflon
As far I know Xylan is PEEK not TFE. It came to prominence in the North Sea oil industry. I have had experience of poorly applied Xylan in desaliantion plants where it had no strength and simply was abraided in use and made matters worse.
If there are wet areas and need a barrier protection then painting is after assembly is just as good. If the client wants Teflon this is available in spray packs. If the areas are dry then there is no corrosive cell and not additional protection is required. beware of considering stainless steel as a "solve all". The effect of stainless steel fastenrs in connection with a zinc surface where an aelectrolyte is present could result in corrosion.
With ss fasteners you have the added problem of galling of nut and thread.
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RE: Coating Hot Dip Galvanized bolts with Teflon
A modern version that is applied correctly will provide very good corrosion performance.
RE: Coating Hot Dip Galvanized bolts with Teflon