Rust proofing after cutting threads

scott2640 · Apr 4, 2017

I need to make up several very long bolts for my build (some as big as 40 inches). I found a good price on 5/8" galvanized bar stock that I can cut to length and thread to my specifications. I don't want use SB rod, sticker shock!

After I cut the threads, and there by remove all the galvanizing from the bar stock in the threaded area, what is the best way to treat the exposed steel to prevent/avoid the threads rusting? Epoxy? Paint?

appreciate the input.

motion30 · Apr 4, 2017

Depends on what these bolts are holding . I always like Mercury soft seal or similar product the coat the same size bolts so they would not corrode when they are going through a housing

gaston · Apr 4, 2017

Look up Cold Gal
http://www.galvatech2000.com/documents/docpdf/20-frequently_asked_questions_rust-anode_eng.pdf

HopCar · Apr 4, 2017

It might be worth a call to these folks and see if they can supply you with galvanized bolts as long as you need.
Videos - Portland Bolt

Watch the videos about making galvanized bolts. Very interesting.

sdowney717 · Apr 4, 2017

Marine grease.
You could overdrill the hole and line with polyethylene tubing, then put the bolt in with marine grease slathered on the threads. The tubing will reject water and keep the bolts dry, and the marine grease is water resistant.

diver dave · Apr 4, 2017

316 stainless 5/8" round bar is just under $20 for 48"

DHeckrotte · Apr 4, 2017

You could also consider making up the bolts in plain steel and then having them galvanized. There are folks in the business and probably Rochester is large enough to have such a shop. Well, certainly Buffalo!

https://www.galvanizeit.org/about-aga/galvanizer-locations/location/ny

mbevins · Apr 5, 2017

DHeckrotte said:
You could also consider making up the bolts in plain steel and then having them galvanized. There are folks in the business and probably Rochester is large enough to have such a shop. Well, certainly Buffalo!

https://www.galvanizeit.org/about-aga/galvanizer-locations/location/ny

Unfortunately these facilities typically surcharge for small batch jobs. So much so that it's not worth it.

jleonard · Apr 5, 2017

Why not buy galvanized threaded rod? McMaster Carr has these in various lengths.

bayview · Apr 5, 2017

I use corrosion pro.

Nomad Willy · Apr 5, 2017

I'd find some pine tar.

TJM · Apr 5, 2017

Rust protection against what elements and where is the application ?
Above water line ?
Sea water ?
Mission critical stuff ?
Submersion or encapsulated ?

Will you be able to view the area for inspection every 5 or so years ?
SS is only good where there is oxygen to keep the surface protected.
Typically galvanized products are not used on boats.

We all have good opinions and responses, but we need more info.

Rust proofing after cutting threads

scott2640

Veteran Member

motion30

Guru

gaston

Guru

HopCar

Guru

sdowney717

Guru

diver dave

Guru

DHeckrotte

Guru

mbevins

Guru

jleonard

Guru

bayview

Guru

Nomad Willy

Guru

TJM

Senior Member

Similar threads

Latest posts