heat treated/hardened threaded rod vs regular?

[PoorOwner]

I picked up a threaded rods in 3/8", later I notice it was not galvanized, it was just oiled finish.

I wanted to use it to hang stuff in my garage, hanging piping, etc, just wondering if it is better or worse than the regular stuff. I know they will eventually rust, too?

I think hardened fastener is supposed to be stronger, but are they more brittle?

The good news is, if I were to weld something, they are ready to weld after I strip the oil.

 

[larry_g]

There is no "regular stuff." Threaded rod comes in many different materials and finishes. So if you don't know what you have then it's really difficult to give you an answer.

lg
no neat sig line

 

[matt_i]

Sounds like you received "unplated". It should all be considered "Grade 2 bolt equivalent" unless you purchased something specifically different. Grade B7 which you can buy at mcMaster Carr has an ultimate tensile strength very similar to a Grade 5 bolt.

 

[BD1]

No problem, we use all thread ''zinc'' coated rod for supporting pipe all the time. Plain rod will rust eventually . 3/8'' all thread rod is rated at a 600 pound load .

 

[PoorOwner]

the label just say "plain" The receipt says hardened.
But I think it's just plain steel probably for welding,

Can I spray paint it?

 

[isb cornbinder]

Are you able to weld the parts to joiner nuts then thread the coupling nuts onto the ready-rod?
I doubt you will experience enough rusting, in your lifetime, to change anything. Clean up the rods and hit them with Rustoleum.
I have had my shop horizontal furnace hanging on four ready-rods for 30 years.
https://www.homedepot.com/b/Hardware-Fasteners-Nuts-Rod-Coupling-Nuts/N-5yc1vZc2gl

 

[jumbo61]

Welding on threads isn't ideal. You will have undercut on the threads making it a weak point. Also, it probably isn't a hardened part.

 

[nbpt100]

I have never heard of hardened threaded rod. I am not sure why the label would say that. Only studs used for automotive or milling machine tooling are what i would consider grade 8 or 10.9 equivalent. Some people call those hardened. They are much shorter and usually have a black oxide finish. It is not what you want.

I just learned something from Matt who mentioned the grade B7. Never saw it at a hardware store.....sounds like something McMaster or Grainger would offer.

I have seen different plating and finishes. I would assume any surface rust you may get would take two centuries to be a real problem. If you are worried about it, return what you have and get platted threaded rod. Galvanized, if you can find it, would we more expensive.

An experienced welder can weld to threaded rod no problem. Just like welding to a grade 2 bolt.
Good Luck.

 

[jumbo61]

I have never heard of hardened threaded rod. I am not sure why the label would say that. Only studs used for automotive or milling machine tooling are what i would consider grade 8 or 10.9 equivalent. Some people call those hardened. They are much shorter and usually have a black oxide finish. It is not what you want.

I just learned something from Matt who mentioned the grade B7. Never saw it at a hardware store.....sounds like something McMaster or Grainger would offer.

I have seen different plating and finishes. I would assume any surface rust you may get would take two centuries to be a real problem. If you are worried about it, return what you have and get platted threaded rod. Galvanized, if you can find it, would we more expensive.

An experienced welder can weld to threaded rod no problem. Just like welding to a grade 2 bolt.
Good Luck.

B7 is an spec for a high strength stud for a pressure vessel. Not a common item.

 

[May Pop]

McmasterCarr has many grades of threaded ron

 

[CraigStu]

Unless you are hanging something very heavy I think you will be fine. I'd wash off the oil and paint it and it should last for ever. Heck it's not outside in the weather. I'd grab a pint of whatever paint the local store has that says something about being a rust preventative and a few throw away brushes.