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dfwallis 
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 Topic: CA Pickup Plow "Special Bolt" Meaning?
Posted: Yesterday at 10:25am |
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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?
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1952 CA13092
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dr p
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Posted: Yesterday at 4:18pm |
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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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dfwallis
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Posted: Yesterday at 4:45pm |
 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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1952 CA13092
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Mikez
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Posted: Yesterday 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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dfwallis
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Posted: Yesterday at 5:58pm |
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.
#52? Plow
Edited by dfwallis - 23 hours 1 minutes ago at 6:09pm
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1952 CA13092
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Mikez
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Posted: 22 hours 44 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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dfwallis
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Posted: 22 hours 36 minutes ago at 6:34pm |
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 - 22 hours 22 minutes ago at 6:48pm
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1952 CA13092
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IBWD MIke
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Posted: 10 hours 29 minutes ago at 6:41am |
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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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dfwallis
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Posted: 6 hours 27 minutes ago at 10:43am |
IBWD MIke wrote:
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. |
The two bolts referenced were normal hex bolts (I'm reasonably sure the bolts I removed were original), only they were fine thread.
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1952 CA13092
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dfwallis
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Posted: 6 hours 2 minutes ago at 11:08am |
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I think my conclusion is that "special" just means any characteristic that is different from a standard hex head coarse thread (4140?) bolt.
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1952 CA13092
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wjohn
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Posted: 2 hours 50 minutes ago at 2:20pm |
In general "special" could mean any deviation from whatever hardware standard (i.e. ISO etc. documentation) "typical" bolts come from. Could be as simple as the threads being a different pitch, a different hex size for the head, a non-standard length of threads on the shaft, a specified length of chamfer on the end leading to the threads, etc. etc. or something really obvious like a weird shape, totally different head type, or different material.
All "special" really tells you is that technically there is at minimum one small thing that doesn't line with the standard. Sometimes you can get away with an off-the-shelf bolt built per whatever standard, and sometimes you can't, but the manufacturer (AC in this case) typically had some reason for choosing that special bolt in the first place. It could just be something that made it easier to assemble or it could be something that kept it from failing in the field.
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1939 B, 1940 B, 1941 WC, 1951 WD, 1952 CA, 1956 WD-45
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