×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Help Identifying a bolt

Help Identifying a bolt

Help Identifying a bolt

(OP)
I have 8 hex head bolts I pulled from a load cell and cannot identify the manufacturer  or properties of these bolts.  The only information I have is engraved on the head of the bolt is the symbol "I^2" (without the ^ symbol).

Can anyone help point me in the right direction here?

RE: Help Identifying a bolt

You mean it says I2?

Patricia Lougheed

******

Please see FAQ731-376: Eng-Tips.com Forum Policies: Eng-Tips.com Forum Policies for tips on how to make the best use of the Eng-Tips Forums.

RE: Help Identifying a bolt

(OP)
Yes,

I cannot find a clue anywhere as to who made this or what it's properties may be.

RE: Help Identifying a bolt

(OP)
The only other information I can add is I just tested the hardness, and the bolts are coming out ~45Rc.

Can anyone help suggest what grade this might be?

RE: Help Identifying a bolt

I looked here, but didn't see it.  If I have time, I'll do some other searches, but can't promise anything.

Patricia Lougheed

******

Please see FAQ731-376: Eng-Tips.com Forum Policies: Eng-Tips.com Forum Policies for tips on how to make the best use of the Eng-Tips Forums.

RE: Help Identifying a bolt

Did the mounting bolts possibly come with the load cell? Contact the load cell manufacturer?

Comprehension is not understanding. Understanding is not wisdom. And it is wisdom that gives us the ability to apply what we know, to our real world situations

RE: Help Identifying a bolt

(OP)
Since it has a hardness of 45Rc this equates to a tensile strength of roughly 214,000 PSI, which is higher than a grade 8 bolt to my knowledge.  I have no idea what this is

RE: Help Identifying a bolt

How can you approximate the tensile strength without knowing the material?  What alloy are you assuming it is?

It is better to have enough ideas for some of them to be wrong, than to be always right by having no ideas at all.

RE: Help Identifying a bolt

Different materials have different tensile values at the SAME hardness.

It is better to have enough ideas for some of them to be wrong, than to be always right by having no ideas at all.

RE: Help Identifying a bolt

Can you find a 9th bolt?  

Then you pull the 9th bolt in half and record the tension. Use that (destroyed) bolt as a material sample, and compare its chemistry to the rest.  

RE: Help Identifying a bolt

Are you sure you are not looking at a 12.9 grade bolt?
B.E.

The good engineer does not need to memorize every formula; he just needs to know where he can find them when he needs them.  Old professor

RE: Help Identifying a bolt

My previous link was to the US DOD Handbook "Listing of Fastener Manuacturer's Identification Symbols" (MIL-HDBK-57E):
http://www.dscp.dla.mil/contract/pdf/MIL-HDBK-57E.pdf

The I2 symbol doesn't seem to be in there.  The only other reference that I can find that is more of an international one is "The Fastener Manufacturer Identification Symbols International Guide" by Fastener Technology.  I don't have a copy of this, so I don't know if the I2

Patricia Lougheed

******

Please see FAQ731-376: Eng-Tips.com Forum Policies: Eng-Tips.com Forum Policies for tips on how to make the best use of the Eng-Tips Forums.

RE: Help Identifying a bolt

Sorry MattBores, I don't see any I2 in any of the registered fastener manufacturer's markings books that I have. This isn't too uncommon though. Products made per print can be marked with whatever the enduser desires. If the information is available from the load cell manufacturer this would be a good place to start. Otherwise there are some fastener suppliers/manufacturers that can test chemistry and hardness for you. http://www.fastenal.com/web/services.ex?action=CustManf

Assuming through hardened to 45Rc, this is a relatively high hardness for a threaded fastener. What is the application for these fasteners?

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources