Tolerance

[Cuyanausul]

U R G E N T

Please help me, we installed 16 bolts anchored to a concrete structure that will support a 17 tons tank, and no one noticed the bolts came with a smaller diameter, it was supposed to be 1 1/4" each and they actually are 1 1/8", I need to know where to find the tolerance for this dimension and I don´t have the time to buy the required standar. We are talking about 16 bolts.
Thank you

 

[oldrunner]

Go back to your engineer of record and have him review his calculations. If the bolts are for uplift, then your factor of safety should be reviewed.

If the bolts were for shear, then, again, review the calculations.

Actually there isn't a tolerance for this kind of situation. It's check the calcs and see it they still work. What would be ideal, is that he overdesigned the bolts.

If you are a contractor, don't take the responsibity of accepting these bolts.

 

[mog69]

You'll find dimensional data on most common sizes in Machinerys' or Kemps' Handbooks.

 

[pecidar]

you were shipped the wrong bolts.
there is a very very small plus/minus on diameter which would depend on thread grade but I can assure you the tolerance is nowhere near 1/8".
threaded fasteners are generally made to pretty precise tolerances, nut threads would certainly never fit otherwise.
the question as to whether the smaller bolts are suitable for your application can only be answered by the engineer of record.

 

[Cuyanausul]

Great help, thank you, I promise to send link to uploaded videos after installed if you are interested...

We were just told the security factor was large enough! we are covered. Thks again

 

[arto]

1-1/8"-8UN = 0.728in^2
1-1/4"-8UN = 0.929in^2
so you're ~ 78%of the original strength

 

[MintJulep]

Assuming that the wrong size bolts are of the same grade that the right sized bolts are supposed to be.

If one thing was wrong ...

 

[Cuyanausul]

Yes they are the same grade, 60,000 psi

 

[IFRs]

You may have just lost all your corrosion allowance or may be below the minimum size by code or not meet the customer specifications

 

[Cuyanausul]

Thnk you, wich code aplies for this case?