Bolt ID help please

[Rob M.]

I have 2 part numbers from the 65 AIM. I would like to know the size, length and thread pitch. Head markings would be a plus too.

122017 Rear clamp (bracket welded to frame) for e-brake cable.

181362 Top bolt for idler arm.

Thanks,
Rob

[Joe L.]

Re: Bolt ID help please

Rob-----

First off, the upper bolt for the idler arm bracket is GM #181365 and NOT GM #181362. That kind of mistake sent me off "on a wild goose chase". In any event, both of the fastners that you're interested in were PRODUCTION-only parts; they were never available in SERVICE. Here's what I can tell you about them:

GM #122017----hex head bolt (cap screw); 5/16-18 X 1"; 300-M (SAE Grade ; phosphate finished (possibly zinc, though)

GM #181365----hex head bolt (cap screw); 3/8-24 X 1-1/8"; 300-M (SAE Grade ; phosphate finished.

As far as head markings, I have no idea.

[Joe L.]

Re: Bolt ID help please

Rob-----

First off, the upper bolt for the idler arm bracket is GM #181365 and NOT GM #181362. That kind of mistake sent me off "on a wild goose chase". In any event, both of the fastners that you're interested in were PRODUCTION-only parts; they were never available in SERVICE. Here's what I can tell you about them:

GM #122017----hex head bolt (cap screw); 5/16-18 X 1"; 300-M (SAE Grade ; phosphate finished (possibly zinc, though)

GM #181365----hex head bolt (cap screw); 3/8-24 X 1-1/8"; 300-M (SAE Grade ; phosphate finished.

As far as head markings, I have no idea.

[Rob M.]

Thanks Joe, sorry for the typo. *NM*

[Rob M.]

Thanks Joe, sorry for the typo. *NM*

[Joe L.]

Addendum

Rob-----

A little more info on the bolts:

GM #122017 MAY have been of 1-1/4" length. I have found conflicting information in the specs as far as length goes. I now think that 1-1/4" is more likely the original length. Also, it was of GM 280-M material (SAE grade 5)and NOT 300-M. So, it should have 3 lines and not 6. ONE of the original headmarkings used may have been "WB"

GM #181365 was also of GM 280-M material (SAE grade 5) and NOT 300-M. So, it, too, should have 3 lines and not 6. ONE of the original headmarkings and the one most widely used was "RBW".

The confusion on the material grade is due to the fact that GM replacements for the above-referenced fastners were of 300-M material, but, as I researched it further, the originals were 280-M.

[Joe L.]

Addendum

Rob-----

A little more info on the bolts:

GM #122017 MAY have been of 1-1/4" length. I have found conflicting information in the specs as far as length goes. I now think that 1-1/4" is more likely the original length. Also, it was of GM 280-M material (SAE grade 5)and NOT 300-M. So, it should have 3 lines and not 6. ONE of the original headmarkings used may have been "WB"

GM #181365 was also of GM 280-M material (SAE grade 5) and NOT 300-M. So, it, too, should have 3 lines and not 6. ONE of the original headmarkings and the one most widely used was "RBW".

The confusion on the material grade is due to the fact that GM replacements for the above-referenced fastners were of 300-M material, but, as I researched it further, the originals were 280-M.

[Rob M.]

Joe, thanks again *NM*

[Rob M.]

Joe, thanks again *NM*