Grade 8 Shear Bolt?

[madtowneast]

Hi All,

I broke a bolt on my Case IH BS174R, specifically part # BER657199. The description is Bolt - Grade 8.8 Shear, & Nut. Is there such a thing as Grade 8 shear bolts?

Does anybody know what size the bolt is? The parts diagram says 6 are needed and I can’t figure where the other 5 are.

Thanks!

 

[DK35vince]

8.8 is a metric bolt, equal to a grade 5 in SAE

 

[WranglerX]

Parts list probably means a kit/packet of 6 so you have spares....

And don't confuse SAE grade 8 with metric 8.8...... Both SAE grade 5 and metric 8.8 are 120,000 shear bolts....

 

[ptsg]

Leaving this here. May help future readers.

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[madtowneast]

Thanks for the replies!

Can anybody tell me the size of the bolt that I need?

 

[WranglerX]

Thanks for the replies!

Can anybody tell me the size of the bolt that I need?

Many times they are 1/4 inch, BUT it depends on application, what is diameter of hole you are going to put bolt in....

 

[WinterDeere]

Many times they are 1/4 inch, BUT it depends on application, what is diameter of hole you are going to put bolt in....

Likely not 1/4 inch if it's grade 8.8!

 

[Jstpssng]

Thanks for the replies!

Can anybody tell me the size of the bolt that I need?

It might be easiest just to order the parts kit, unless you have a Case dealer near you. You probably will have it next week.
Better yet, order two; that way you can use one, and match the other up at your leisure.

 

[WranglerX]

Likely not 1/4 inch if it's grade 8.8!

Maybe 6mm then.... OR probably could convert to 1/4 inch Grade 5...
Could always determine size from broken pieces or part list for tractor/impliment....

 

[oldnslo]

As point of reference:
6 mm is a little smaller than 1/4 inch
8 mm very close to 5/16 inch
10 mm is a little larger than 3/8 inch
12 mm is a little smaller than 1/2 inch

 

[etpm]

Leaving this here. May help future readers.

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Thanks for posting that little chart. I have seen similar when I looked for fastener strength comparisons between Metric and SAE but never bothered to save what I found. I even have a few editions of Machinery's Handbook, the earliest from 1918 and the newest from 2015 and the newest edition has the info. But now, thanks to you, I have it on my computer desktop also and this will certainly save time.
Cheers,
Eric

 

[Jerry/MT]

Thanks for the replies!

Can anybody tell me the size of the bolt that I need?

8.8 mm in diameter. It's a metric bolt. As far as length, does your manual specify a length? You'll need an 8.8 mm nut(s) also.

 

[stumblinhorse]

I think there is some confusion here. 8.8 is the grade nothing to do with diameter, per se. Metric shear bolt size will be something like M10x50 “property class” 8.8.

 

[WranglerX]

8.8 mm in diameter. It's a metric bolt. As far as length, does your manual specify a length? You'll need an 8.8 mm nut(s) also.

8.8 is a grade of bolt... 120,000 PSI shear not a diameter.... Metric bolts are generally even numbers as 6mm, 8mm, 10mm, 12mm and so on....

 

[Snobdds]

I think there is some confusion here. 8.8 is the grade nothing to do with diameter, per se. Metric shear bolt size will be something like M10x50 “property class” 8.8.

This is the info to persuse. It probably going to be m8 or m10 by 1.0 or 1.25 thread pitch. Then figure out the length. 20mm, 30mm. Etc.

Stores will sell them denoted as M10x1.0x20.

 

[LD1]

Did you ever figure out the bolt size?

 

[jwmorris]

What is the diameter of the hole it goes in?

 

[Jerry/MT]

I think there is some confusion here. 8.8 is the grade nothing to do with diameter, per se. Metric shear bolt size will be something like M10x50 “property class” 8.8.

I stand corrected!

 

[madtowneast]

I found the new model of the driveshaft part list:

https://patsdriveline.com/wp-content/uploads/2020/02/comer_PTO_Driveshafts.pdf

On page 65

it is supposed to be an M8 or M10

the diameter is ~5/8 inch, so M10

 

[KWentling]

I found the new model of the driveshaft part list:

https://patsdriveline.com/wp-content/uploads/2020/02/comer_PTO_Driveshafts.pdf

On page 65

it is supposed to be an M8 or M10

the diameter is ~5/8 inch, so M10

I assume you meant 3/8 inch, as 5/8 inch would be M16.