Welcome! Please use the navigational links to explore our website.
Company Logo (800) 853-2651 Shop Now
   Allis Chalmers Case Farmall IH Ford 8N,9N,2N Ford
   Ferguson John Deere Massey Ferguson Minn. Moline Oliver

Ford 9N, 2N & 8N Discussion Forum
:

Bolt Grade

Welcome Guest, Log in or Register
Author  [Modern View]
Royse

01-31-2023 15:39:36




Report to Moderator

Anyone recognize the grading on this bolt?

It's the shear bolt out of my 3 pt snowblower. I picked up a rock and broke the bolt.
Should be an easy fix but I don't want to replace it with something too hard.




[Log in to Reply]   [No Email]
Hobo,NC

02-06-2023 09:10:45




Report to Moderator
 Re: Bolt Grade in reply to Royse, 01-31-2023 15:39:36  
I just happen to stumble across this site.



Link



[Log in to Reply]  [No Email]
Royse

02-06-2023 06:24:15




Report to Moderator
 Re: Bolt Grade in reply to Royse, 01-31-2023 15:39:36  
Quoting Removed, click Modern View to see

Agreed. And that would have worked fine. Except no local store had one so I was ordering online anyways.



[Log in to Reply]  [No Email]
TheOldHokie

02-06-2023 04:26:09




Report to Moderator
 Re: Bolt Grade in reply to Royse, 01-31-2023 15:39:36  
Quote: Royse (quoted from post at 22:18:32 02/05/23) Just wanted to follow up on this post. I found the original part
number and ordered a replacement. Not cheap, but they are
indeed M8x50 cl 6.8 bolts and the snowblower is back in service.
Thanks for the help


A 5/16 x 2 grade 2 bolt is dirt cheap.
This post was edited by TheOldHokie on 02/06/2023 at 04:36 am.

[Log in to Reply]  [No Email]
Royse

02-05-2023 18:18:32




Report to Moderator
 Re: Bolt Grade in reply to Royse, 01-31-2023 15:39:36  
Just wanted to follow up on this post. I found the original part
number and ordered a replacement. Not cheap, but they are
indeed M8x50 cl 6.8 bolts and the snowblower is back in service.

Thanks for the help!!

Third Party Image

Third Party Image

[Log in to Reply]  [No Email]
showcrop

02-03-2023 06:03:15




Report to Moderator
 Re: Bolt Grade in reply to Royse, 01-31-2023 15:39:36  
Quoting Removed, click Modern View to see

Nothing wrong with the software here. Quotes work just fine in modern view. The problem is outdated old pharts insisting on using the old view.



[Log in to Reply]  [No Email]
TheOldHokie

02-03-2023 05:34:32




Report to Moderator
 Re: Bolt Grade in reply to Royse, 01-31-2023 15:39:36  
Quoting Removed, click Modern View to see

You can insert special characters using the standard HTML escape sequence which is &# followed by the numeric ASCII code for the character followed by a ;. Just type it as a string with no embedded spaces and it will display the desired character. The ASCII code for quote is 34.

Displayed as:

"

TOH



[Log in to Reply]  [No Email]
Dave G9N

02-01-2023 18:08:13




Report to Moderator
 Re: Bolt Grade in reply to Royse, 01-31-2023 15:39:36  
It may be that the head die was worn and it really is an ISO grade 8.8. You aren't likely to find a 6.8 anywhere. They bang these things out in lots of 100,000 so a little wear on the head marking is not unlikely.
The metric grade does indicate strength. The first number(s) are the tensile strength in 100s of MPa and the number after the period is the yield strength expressed as a percentage of the ultimate strength. 8.8 indicates 800 MPa uts and 640 MPa ys. The actual spec is 830/660 if you're splitting hairs. (120/96 in ksi).
SAE Grade 5 is 120 ksi uts, 92 ys up to 1 inch diameter and 105/81 from 1 inch to 1 1/2 inch.

[Log in to Reply]  [No Email]
TheOldHokie

02-01-2023 06:46:22




Report to Moderator
 Re: Bolt Grade in reply to Royse, 01-31-2023 15:39:36  
Quoting Removed, click Modern View to see

Metric fastener and ISO grade markings are more informative than SAE. First number is yield strength and second number indicates ratio of yield to tensile strength.

6.8 is not a standard grade but maybe a special. I initially read that as 8.8 which is standard and roughly equivalent to SAE grade 5.

TOH



[Log in to Reply]  [No Email]
Jim.ME

02-01-2023 03:28:31




Report to Moderator
 Re: Bolt Grade in reply to Royse, 01-31-2023 15:39:36  
Meteor has some operator/parts books for the snow blowers online, you might check for your model there. The couple I looked at show shear bolts in fractional sizes and #2, which would indicate grade 2 to me. I would agree with wore out, that your old bolt is a 6.8 metric bolt.
This post was edited by Jim.ME on 02/01/2023 at 03:29 am.



[Log in to Reply]  [No Email]
Tim PloughNman Daley

02-01-2023 03:01:59




Report to Moderator
 Re: Bolt Grade in reply to Royse, 01-31-2023 15:39:36  
This post does not show your picture but other pix looks like and older style bolt, B4 they started marking the grades. I'd say marks are just the manufacturers' logo and part ID number. Shear bolts are softer grades so they snap off as intended but you already know this. A Grade 2 or 5 bolt should be OK.


Tim Daley(MI)



[Log in to Reply]  [No Email]
wore out

01-31-2023 23:03:51




Report to Moderator
 Re: Bolt Grade in reply to Royse, 01-31-2023 15:39:36  
Quoting Removed, click Modern View to see

Quotation marks don't work with the outdated software here, but two apostrophes work to make a quotation mark.



[Log in to Reply]  [No Email]
stevieb49829

01-31-2023 21:08:52




Report to Moderator
 Re: Bolt Grade in reply to Royse, 01-31-2023 15:39:36  
Royse, I can't tell. Was there a weak spot engineered into the bolt? Try a grade 2 first. If it shears too easily, go to a grade 5. But I'd file a notch around the grade 5, just to make sure it comes apart where you want it to.



[Log in to Reply]  [No Email]
Royse

01-31-2023 19:19:59




Report to Moderator
 Re: Bolt Grade in reply to Royse, 01-31-2023 15:39:36  
wore out, I assume it is metric. Roughly the same size as 5/16.

The snowblower is a Meteor brand made in Canada.



[Log in to Reply]  [No Email]
R Geiger

01-31-2023 18:33:16




Report to Moderator
 Re: Bolt Grade in reply to Royse, 01-31-2023 15:39:36  
I would never use a grade 5 bolt as a shear bolt! Grade 2 is what I use!



[Log in to Reply]  [No Email]
ASEguy

02-03-2023 05:11:51




Report to Moderator
 Re: Bolt Grade in reply to R Geiger, 01-31-2023 18:33:16  
That's what I use.



[Log in to Reply]  [No Email]
wore out

01-31-2023 17:16:19




Report to Moderator
 Re: Bolt Grade in reply to Royse, 01-31-2023 15:39:36  
That is metric bolt grade. (Must be a metric bolt.)

Metric bolt grade 6.8 is similar to a Grade 2.

''The higher the ISO numbers are, the stronger the bolt. A metric bolt designated as ISO class 6.8 roughly corresponds in strength to an SAE Grade 2 bolt. Bolts of ISO class 8.8 and the slightly stronger class 9.8 roughly correspond to an SAE Grade 5 bolt. An ISO Class 10.9 bolt roughly corresponds to an SAE Grade 8 bolt.''

[Log in to Reply]  [No Email]
stevieb49829

01-31-2023 21:11:16




Report to Moderator
 Re: Bolt Grade in reply to wore out, 01-31-2023 17:16:19  
Wore Out, how did you get quotation marks to work in your response?



[Log in to Reply]  [No Email]
oldsarge

02-01-2023 08:02:02




Report to Moderator
 Re: Bolt Grade in reply to stevieb49829, 01-31-2023 21:11:16  

I'm wore out,but not'' Wore Out''. I use apostrophe twice and it comes thru the machine as quotes (shrug)



[Log in to Reply]  [No Email]
Royse

01-31-2023 17:09:21




Report to Moderator
 Re: Bolt Grade in reply to Royse, 01-31-2023 15:39:36  
Not sure why the pics didn't load. Trying again.

Third Party Image

Third Party Image



[Log in to Reply]  [No Email]
J Hamilton

01-31-2023 16:05:49




Report to Moderator
 Re: Bolt Grade in reply to Royse, 01-31-2023 15:39:36  
I'm not seeing a picture. But a shear bolt is normally a grade 5



[Log in to Reply]  [No Email]
[Options]  [Printer Friendly]  [Posting Help]  [Return to Forum]   [Log in to Reply]

Hop to:


TRACTOR PARTS TRACTOR MANUALS
We sell tractor parts!  We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today. [ About Us ]

Home  |  Forums


Copyright © 1997-2023 Yesterday's Tractor Co.

All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy

TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.

Yesterday's Tractors - Antique Tractor Headquarters

Website Accessibility Policy