Grade 8 shear bolt confirmed!

   / Grade 8 shear bolt confirmed! #51  
I have looked for the shear properties of the different grade bolts per diameter without any definitive results. I work in a Material Test Lab. As time permits, I plan to do a shear load test on each of the following:
Grade 2, 5, and 8; in diameters of 3/16, 1/4, and 5/16.

If anyone is interested in the results "FOR REFERENCE ONLY", I would be happy to post them when the test is completed.
 
   / Grade 8 shear bolt confirmed! #52  
If I bought a woods blower.. and it came with a grade 8 bolt.. and it broke a weld on the impellor due to their error.. i think I would be taking the unit back to get a new one...

Soundguy
 
   / Grade 8 shear bolt confirmed! #53  
I would also, but my friend just repaired it..... sometimes it is faster to do the repair and get it done with than to deal with a warranty claim that might take weeks to complete. In MA, you have to be prepared for snow at any time. Today it is 56 degrees out and last night it was 20 degrees...... wild temperature swings and you never know when it will snow....
 
   / Grade 8 shear bolt confirmed! #54  
As a comment towards the original topic before it jumped off the tracks....if you are experiencing a situation where the Grade 2 is almost, but not quite enough, try this. Instead of tightening the nut down until the lock washer engages, run a nut down until it just touches. Then run another nut down and jam them together to lock them in place. With the tension removed from the bolt and a little play available to the 2 shear points (assuming you have a crossbolt shearpin rather than an inline) you will possibly get a little more life from your shear bolts. Make sure to use the jam nut though or you will find your shearbolt sailing off into the sunset.
 
   / Grade 8 shear bolt confirmed! #55  
I would be very interested in your results. Do you plan to test just shear or shear in combination with tension? How will you factor the "double shear" resulting from the bolt extending through both sides of the yoke on either side of the shaft? We have ready access to the failure load for bolts in both tension and shear for "normal" bolted connections, but the situation presented by the typical shear bolt is quite different because of the many variables present.
 
   / Grade 8 shear bolt confirmed! #56  
It has become very obvious that we must select a committee to select the personel that will address the shear bolt dilema by setting up a task force to investigate the need for a committee to determine if more shear bolt research is needed.

Egon
 
   / Grade 8 shear bolt confirmed! #57  
</font><font color="blue" class="small">( It has become very obvious that we must select a committee to select the personel that will address the shear bolt dilema by setting up a task force to investigate the need for a committee to determine if more shear bolt research is needed.)</font>

The head of that committee should be Nomad as he was the first who jumped off the track of original topic;-0?

Concerning shear bolt tests (combined of tension+shear or shear stress alone); Tests on standart Grade 2, 5 or 8 won't be helpful. Because the true problem here is "selection of GradeX" where X is unknown. Tests should be made on farmers' own systems (shaft+pto+etc) each of these systems is different from another farmer's. I mean tensile+shear forces on farmer's connections should be determined first before determining the bolt type/size. Having test/measurement results of tousands of these forces measured on the farmers' systems, and doing some statistical averaging analysis, average GradeX can be determined. Well, since test number will be a lot by such real field tests on farmers' systems the only logical way of doing such tests is let them farmers do themselves and this can be done with a special bolt standart test specimen which will be given within the implement box.

By the way, if you search the net, all data available for fasteners of Grade2, 5 and 8 and in any size.

Ps: I think this is the 1st post on TBN forum with a posting date of 2004. ;-0
 
   / Grade 8 shear bolt confirmed! #58  
"The first shall be last and the last shall be first" Just where were the words first spoken, Nomad?
 
   / Grade 8 shear bolt confirmed! #59  
Nope;

Re: Grade 8 shear bolt confirmed!
12/31/03 10:59 PM

Egon
 
   / Grade 8 shear bolt confirmed! #60  
</font><font color="blue" class="small">( Nope;

Re: Grade 8 shear bolt confirmed!
12/31/03 10:59 PM

Egon )</font>

Egon, what is this? I can't see any post at 10:59 PM of 12/31/03
 
 

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