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CA Pickup Plow "Special Bolt" Meaning?
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dfwallis View Drop Down
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Joined: 09 Mar 2023
Location: DFW
Points: 941 		Post Options Post Options   Thanks (0) Thanks(0)   Quote dfwallis Quote  Post ReplyReply Direct Link To This Post Topic: CA Pickup Plow "Special Bolt" Meaning?
    Posted: 20 hours 29 minutes ago at 10:25am
What does the "special" refer to relative to the bolts used for the pickup plow?  Those I checked were fine thread.  Were these hardened beyond 4140?
1952 CA13092
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dr p View Drop Down
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Joined: 24 Feb 2019
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Points: 1537 		Post Options Post Options   Thanks (0) Thanks(0)   Quote dr p Quote  Post ReplyReply Direct Link To This Post Posted: 14 hours 36 minutes ago at 4:18pm
sometimes allis used a plow bolt with a head shape that was unique to them. you can't find them anymore but with a welder and a die grinder you can get close enough
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Points: 941 		Post Options Post Options   Thanks (0) Thanks(0)   Quote dfwallis Quote  Post ReplyReply Direct Link To This Post Posted: 14 hours 9 minutes ago at 4:45pm
Originally posted by dr p dr p wrote:

sometimes allis used a plow bolt with a head shape that was unique to them. you can't find them anymore but with a welder and a die grinder you can get close enough

I only found 1 like that.  I found a "thumb screw" head bolt the right thread size and ground it to match.  The target bolt was basically a 3/4" round head with two opposite side flats.  I ground it to fit the slot in the plowshare and the bracket it mounts to.  Most of the other "special" bolts look like standard hex head bolts.  The only thing special about the ones I checked were that they were fine thread.  But that doesn't seem like a reason to use the term "special".
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Mikez View Drop Down
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Points: 8917 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Mikez Quote  Post ReplyReply Direct Link To This Post Posted: 13 hours 45 minutes ago at 5:09pm
I believe the bolts you’re talking about are the frame bolts right. 
They were some type of a shear bolt. 
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Points: 941 		Post Options Post Options   Thanks (0) Thanks(0)   Quote dfwallis Quote  Post ReplyReply Direct Link To This Post Posted: 12 hours 56 minutes ago at 5:58pm
Originally posted by Mikez Mikez wrote:

I believe the bolts you’re talking about are the frame bolts right. 
They were some type of a shear bolt. 

Two bolts below were 3/4 hex head bolts both fine threaded and labeled "special".  Would those be "shear" bolts?  Or would they be higher strength bolts?  The second one is the upper bolt of the U bracket.  I used grade 8.  I don't think it matters much at this point, was just curious.
 
CA Pickup Plow
 



#52? Plow




Edited by dfwallis - 12 hours 45 minutes ago at 6:09pm
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Mikez View Drop Down
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Points: 8917 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Mikez Quote  Post ReplyReply Direct Link To This Post Posted: 12 hours 28 minutes ago at 6:26pm
The original part numbers for those were 
321893 then the numerical book says use 916290 which are grade 5. 3/4” x 3-1/2”
321896 numerical book says to use 916292 which are grade 5. 3/4” x 4-1/4”
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Points: 941 		Post Options Post Options   Thanks (0) Thanks(0)   Quote dfwallis Quote  Post ReplyReply Direct Link To This Post Posted: 12 hours 20 minutes ago at 6:34pm
Originally posted by Mikez Mikez wrote:

The original part numbers for those were 
321893 then the numerical book says use 916290 which are grade 5. 3/4” x 3-1/2”
321896 numerical book says to use 916292 which are grade 5. 3/4” x 4-1/4”

Hmm, grade 5 is roughly equivalent to 4140 which most everything else was, I thought.

Interesting comparison:



Edited by dfwallis - 12 hours 6 minutes ago at 6:48pm
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IBWD MIke View Drop Down
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Points: 4278 		Post Options Post Options   Thanks (0) Thanks(0)   Quote IBWD MIke Quote  Post ReplyReply Direct Link To This Post Posted: 13 minutes ago at 6:41am
Could it be a shoulder bolt? I've seen that in manuals too. Had that sort of stuff apart but been a long time ago and can't remember.
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