Help please
Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=139878
Printed Date: 20 Sep 2025 at 6:49pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: Help please
Posted By: rbthefirst
Subject: Help please
Date Posted: 28 Jun 2017 at 12:46pm
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I have a 1940 AC. I have a lot of missing or broken bolts. Is there any reference material to find sizes and grades of bolts so I can buy new ones?
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Replies:
Posted By: tadams(OH)
Date Posted: 28 Jun 2017 at 2:54pm
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What model 1940 AC do you have, there was more than one model built
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Posted By: rbthefirst
Date Posted: 28 Jun 2017 at 3:00pm
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It is a 1940 Allis Chalmers B.
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Posted By: AaronSEIA
Date Posted: 28 Jun 2017 at 4:08pm
I would say all the sheet metal would be fine with grade 2. Anything holding structural should be 2 or 5. Anything engine should probably be replaced from AGCO. Parts book will list part number but not size.
AaronSEIA
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Posted By: corbinstein
Date Posted: 29 Jun 2017 at 7:21am
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easier to use grade 8 for everything......
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Posted By: Gerald J.
Date Posted: 29 Jun 2017 at 10:25am
Grade 8 is stronger, but not suitable for all applications. Its considered to be weaker for shock applications than grade 5 and for sure too strong for shear bolt applications where grade 2 would generally be specified so the bolt shears before damaging the shear bolt holes. Then grade 5 often costs more than twice the price of grade 2 and grade 8 a lot more than grade 5 so using grade 8 where grade 2 would be plenty strong gets expensive though having only one grade on hand is handy.
Gerald J.
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Posted By: BrianC
Date Posted: 29 Jun 2017 at 10:40am
Look at the online AGCO parts list books. Each page calls out Allis p/n for the bolts.
The last page in the parts book is titled Hardware List, it states the size of the fasteners.
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