Stainless Bolts
Stainless Bolts
(OP)
I'm trying to replace an HH Bolt A325 with a stainless equivalent. What about the nut?
Would that be a a grade 8.8 or 10.2?
Would that be a a grade 8.8 or 10.2?
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RE: Stainless Bolts
(For further note, I've under taken a project to replace all of the carbon steel fasteners underneath my car with 18-8 or A2-70 fasteners, this is an annoying project since the A2-70 M10 coarse fasteners I'm using have a different wrench size than what I'm replacing, I have to keep swaping wrenches.)
Nick
I love materials science!
RE: Stainless Bolts
Regards,
Cory
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RE: Stainless Bolts
A close second issue is the galvanic corrosion of the joined items. I would never bolt carbon steel with stainless fasteners. Protecting the less corrosion resistant material becomes very difficult.
The higher strength SS bolts are usually cold worked (rolled threads, not cut). This helps galling some, but anti-sieze agents are still needed. If you need strength and corrosion resistance you may need to look at 17-4PH (or 15-5 or 17-7) age hardened stainless.
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Corrosion never sleeps, but it can be managed.
http://www.trenttube.com/Trent/tech_form.htm
RE: Stainless Bolts
(although I do use plenty of well rubbed in MoS2 adn Ni based anti-sieze on the bolts and threads)
nick
RE: Stainless Bolts
The Statue of Liberty is a classic, Fe vs Cu.
Photos of a yatch that used 6%Mo SS for the hull, and Monel rivets. The hole in hull plates corroded out and the whole thing came apart.
In you case Nick, the risk is small and the benifit is big. I would do it too.
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Corrosion never sleeps, but it can be managed.
http://www.trenttube.com/Trent/tech_form.htm
RE: Stainless Bolts
This will be used to secure stainless parts together underwater (fresh). I will be using a loctite to make sure ther bolts never come apart as well as to prevent galling. The manufacturer had A325 cadmium plated bolts but I wanted to go to a stainless because something failed (I don't know what yet until I drain the tank). The bolts probably aren't the problem but I thought why not upgrade them for corrosion if I can keep a similar strength. The tank has only been drained 1 in 12 years so I don't have a lot of oppurtunities to fix loose bolts.
RE: Stainless Bolts
RE: Stainless Bolts
Thanks!
Pete