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Help please
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rbthefirst View Drop Down
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Joined: 10 May 2017
Location: philipsburg
Points: 15 		Post Options Post Options   Thanks (0) Thanks(0)   Quote rbthefirst Quote  Post ReplyReply Direct Link To This Post Topic: Help please
    Posted: 28 Jun 2017 at 12:46pm
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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tadams(OH) View Drop Down
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Joined: 17 Sep 2009
Location: Jeromesville, O
Points: 11173 		Post Options Post Options   Thanks (0) Thanks(0)   Quote tadams(OH) Quote  Post ReplyReply Direct Link To This Post Posted: 28 Jun 2017 at 2:54pm
What model 1940 AC do you have, there was more than one model built
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rbthefirst View Drop Down
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Joined: 10 May 2017
Location: philipsburg
Points: 15 		Post Options Post Options   Thanks (0) Thanks(0)   Quote rbthefirst Quote  Post ReplyReply Direct Link To This Post Posted: 28 Jun 2017 at 3:00pm
It is a 1940 Allis Chalmers B.
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AaronSEIA View Drop Down
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Joined: 11 Sep 2009
Location: Mt Pleasant, IA
Points: 2578 		Post Options Post Options   Thanks (0) Thanks(0)   Quote AaronSEIA Quote  Post ReplyReply Direct Link To This Post 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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corbinstein View Drop Down
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Joined: 31 Jul 2014
Location: Oklahoma
Points: 796 		Post Options Post Options   Thanks (0) Thanks(0)   Quote corbinstein Quote  Post ReplyReply Direct Link To This Post Posted: 29 Jun 2017 at 7:21am
easier to use grade 8 for everything......
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Gerald J. View Drop Down
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Joined: 12 Sep 2009
Location: Hamilton Co, IA
Points: 5636 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Gerald J. Quote  Post ReplyReply Direct Link To This Post 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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BrianC View Drop Down
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Joined: 16 Jun 2011
Location: New York
Points: 1619 		Post Options Post Options   Thanks (0) Thanks(0)   Quote BrianC Quote  Post ReplyReply Direct Link To This Post 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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