outdoor bolts that dont rust or seize up?

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Forum topic by WoodNSawdust posted 11-26-2015 05:08 PM 366 views 0 times favorited 2 replies Add to Favorites Watch
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1417 posts in 593 days

11-26-2015 05:08 PM

Topic tags/keywords: bolts bolts seizing up rust question

Many years ago I bought a cast iron Chimenea from ACE hardware. Every few years I have to replace the vertical chimney due to the sheet metal rusting. The chimney is attached to the cast iron top using 10-32 bolts a half inch long. They screw through holes in the vertical pipe into threaded holes in the cast iron. Unfortunately, being exposed to the weather causes the bolts to rust and seize up in the cast iron.

As you may have guessed, it is time to remove and replace the chimney. I just broke the old chimney away but the bolts will not come out. I have tried WD-40, tapping the screwdriver while turning, and heat.

My question is once I get the bolts out what should I buy to avoid this problem in the future? Maybe Stainless Steal?

-- "I love it when a plan comes together" John "Hannibal" Smith

2 replies so far

View Bluepine38's profile


3335 posts in 2502 days

#1 posted 11-26-2015 06:06 PM

With the little I know about cast iron, it might be easier to drill the bolts out and tap the holes for 1/4-20
bolts. Stainless would be the easiest solution I can think off, you could put some anti seize on the bolts
to help. Automotive stores have small tubes of it, I use it when putting spark plugs in both aluminum and
iron heads, and they come out easily.

-- As ever, Gus-the 77 yr young apprentice carpenter

View WoodNSawdust's profile


1417 posts in 593 days

#2 posted 11-26-2015 06:38 PM

Bluepine38, thank you for your reply. There is not enough of a lip for me to use 1/4 inch bolts. I can drill and tap replacement #10 bolt holes, but in a couple of years the hvac duct will be rusted again and I will have the same problem. I have not thought of automotive anti seize. I will look into it.

-- "I love it when a plan comes together" John "Hannibal" Smith

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