Home » Public Forums » GMCnet » Socket size (12 pt) for front axle output hub bolts?
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| Re: Socket size (12 pt) for front axle output hub bolts? [message #364982 is a reply to message #364981] |
Fri, 25 June 2021 10:22   |
kwharland
Messages: 246
Registered: November 2005
Location: Central Florida
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blur911 wrote on Fri, 25 June 2021 11:10The big axle nut? It's 1-1/2"
Use a 3/4" drive, I broke my 1/2" extensions loosening mine, had to find 3/4"
No, the ones on the output flange. I have the 1 1/2 deep well socket but it's 1/2" and I'll be giving that try first.
1978 Eleganza II
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| Re: Socket size (12 pt) for front axle output hub bolts? [message #364984 is a reply to message #364982] |
Fri, 25 June 2021 10:42 |
Carl S.
Messages: 4186
Registered: January 2009
Location: Tucson, AZ.
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If they are factory, it takes a 7/16" 12 pt socket for those. Torque is quite high (75 ft-lbs), I think 65 ft-lbs will do it with blue locktite.
If they have been changed to the ones McMaster Carr sells, they will be 3/8" 12 pt.
Carl Stouffer
'75 ex Palm Beach
Tucson, AZ.
Chuck Aulgur Reaction Arm Disc Brakes, Quadrabags, 3.70 LSD final drive, Lenzi knuckles/hubs, Dodge Truck 16" X 8" front wheels, Rear American Eagles, Solar battery charging. GMCSJ and GMCMI member
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| Re: Socket size (12 pt) for front axle output hub bolts? [message #367747 is a reply to message #365044] |
Tue, 30 November 2021 14:38 |
blur911
Messages: 166
Registered: December 2020
Location: Kingston, Ontario
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RF_Burns wrote on Sun, 27 June 2021 06:46Be aware of the bolt lengths. You want the bolt to go all the way through the flange for maximum thread contact.
BUT if you have a One-Ton front end, the axle flange on one side is thinner than the other side (or maybe both flanges are thinner than OEM.. I don't recall). This allows the bolt to extend through and it will hit the final drive casing. So those with the One-Ton must ensure the bolt shank does not extend through beyond the flange and check for clearances. I believe this affects the drivers side.
Dang, I finally got my new OE style cv boot installed and I just realized my new flange bolts are too short, I bought 1" and they have to be 1-1/4", maybe even 1-1/2" would do.
Hard to find now, NLA at Grainger and Fastenal, checking some other places.
Some debate about if a typical split-ring lockwasher does any locking due to the bolt hardness, how about using Nord-locks?
Burl Vibert
Kingston, Ontario
1976 GMC 26 foot, Sheridan reno, don't know original model but we call her Roxie
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| [GMCnet] Re: Socket size (12 pt) for front axle output hub bolts? [message #367748 is a reply to message #367747] |
Tue, 30 November 2021 14:49 |
sgltrac
Messages: 2797
Registered: April 2011
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Loctite blue works well.
Sully
Bellevue wa.
On Tue, Nov 30, 2021 at 3:40 PM Burl Vibert wrote:
> RF_Burns wrote on Sun, 27 June 2021 06:46
>> Be aware of the bolt lengths. You want the bolt to go all the way
> through the flange for maximum thread contact.
>>
>> BUT if you have a One-Ton front end, the axle flange on one side is
> thinner than the other side (or maybe both flanges are thinner than OEM.. I
>> don't recall). This allows the bolt to extend through and it will hit
> the final drive casing. So those with the One-Ton must ensure the bolt
> shank
>> does not extend through beyond the flange and check for clearances. I
> believe this affects the drivers side.
>
> Dang, I finally got my new OE style cv boot installed and I just realized
> my new flange bolts are too short, I bought 1" and they have to be 1-1/4",
> maybe even 1-1/2" would do.
> Hard to find now, NLA at Grainger and Fastenal, checking some other
> places.
>
> Some debate about if a typical split-ring lockwasher does any locking due
> to the bolt hardness, how about using Nord-locks?
>
> --
> Burl Vibert
> Kingston, Ontario
> 1976 GMC 26 foot, Sheridan reno, don't know original model but we call her
> Roxie
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
>
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Sully
77 Royale basket case.
Future motorhome land speed record holder(bucket list)
Seattle, Wa.
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| [GMCnet] Re: Socket size (12 pt) for front axle output hub bolts? [message #367750 is a reply to message #367749] |
Tue, 30 November 2021 16:02 |
Bruce Hart
Messages: 1500
Registered: October 2011
Location: La Grange, Wyoming
Karma: 5
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McMaster Carr
Heavy duty split washer product #91104A031 100ea
Alloy Steel 12 point Flange Head Cap Screw Product #91271A644
https://www.mcmaster.com/
On Tue, Nov 30, 2021 at 2:26 PM Burl Vibert wrote:
> I was going to use Loctite blue, was debating whether ditching or changing
> the lockwasher was a good idea as well.
> --
> Burl Vibert
> Kingston, Ontario
> 1976 GMC 26 foot, Sheridan reno, don't know original model but we call her
> Roxie
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
>
--
Bruce Hart
1976 Palm Beach
LaGrange, Wyoming
GMC=Genetically Modified Chevy
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Bruce Hart
1976 Palm Beach
1977 28' Kingsley
La Grange, Wyoming
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| Re: [GMCnet] Re: Socket size (12 pt) for front axle output hub bolts? [message #367751 is a reply to message #367750] |
Tue, 30 November 2021 16:45 |
blur911
Messages: 166
Registered: December 2020
Location: Kingston, Ontario
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Like Fastenal, you have to be a business to order from McMaster Carr in Canada
Bruce Hart wrote on Tue, 30 November 2021 16:02McMaster Carr
Heavy duty split washer product #91104A031 100ea
Alloy Steel 12 point Flange Head Cap Screw Product #91271A644
https://www.mcmaster.com/
On Tue, Nov 30, 2021 at 2:26 PM Burl Vibert wrote:
> I was going to use Loctite blue, was debating whether ditching or changing
> the lockwasher was a good idea as well.
> --
> Burl Vibert
> Kingston, Ontario
> 1976 GMC 26 foot, Sheridan reno, don't know original model but we call her
> Roxie
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
>
--
Bruce Hart
1976 Palm Beach
LaGrange, Wyoming
GMC=Genetically Modified Chevy
_______________________________________________
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Unsubscribe or Change List Options:
Burl Vibert
Kingston, Ontario
1976 GMC 26 foot, Sheridan reno, don't know original model but we call her Roxie
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| [GMCnet] Re: Socket size (12 pt) for front axle output hub bolts? [message #367754 is a reply to message #367751] |
Tue, 30 November 2021 17:55 |
James Hupy
Messages: 6806
Registered: May 2010
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Not in the USA.
Jim Hupy who orders from them all the time.
Salem, Oregon
On Tue, Nov 30, 2021, 2:46 PM Burl Vibert wrote:
> Like Fastenal, you have to be a business to order from McMaster Carr in
> Canada
>
> Bruce Hart wrote on Tue, 30 November 2021 16:02
>> McMaster Carr
>> Heavy duty split washer product #91104A031 100ea
>> Alloy Steel 12 point Flange Head Cap Screw Product #91271A644
>>
>> https://www.mcmaster.com/
>>
>>
>> On Tue, Nov 30, 2021 at 2:26 PM Burl Vibert wrote:
>>
>>> I was going to use Loctite blue, was debating whether ditching or
> changing
>>> the lockwasher was a good idea as well.
>>> --
>>> Burl Vibert
>>> Kingston, Ontario
>>> 1976 GMC 26 foot, Sheridan reno, don't know original model but we
> call her
>>> Roxie
>>> _______________________________________________
>>> GMCnet mailing list
>>> Unsubscribe or Change List Options:
>>>
>>
>>
>> --
>> Bruce Hart
>> 1976 Palm Beach
>> LaGrange, Wyoming
>> GMC=Genetically Modified Chevy
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>
>
> --
> Burl Vibert
> Kingston, Ontario
> 1976 GMC 26 foot, Sheridan reno, don't know original model but we call her
> Roxie
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
>
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| Re: Socket size (12 pt) for front axle output hub bolts? [message #367760 is a reply to message #367747] |
Wed, 01 December 2021 10:26 |
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Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
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blur911 wrote on Tue, 30 November 2021 15:38Dang, I finally got my new OE style cv boot installed and I just realized my new flange bolts are too short, I bought 1" and they have to be 1-1/4", maybe even 1-1/2" would do.
Hard to find now, NLA at Grainger and Fastenal, checking some other places.
Some debate about if a typical split-ring lockwasher does any locking due to the bolt hardness, how about using Nord-locks?
Burl,
The double hex of the OE screws was 3/8 and those that I could get were 7/16. I carry a jar of spares, the 1/2 drive socket and a clicker wrench in case I should have to deal with them on the road. (This has happened once in 16 years and 70+K miles.....
You could have some American friend (you only have a few thousand) order them from McMaster-Carr and ship them to you as "used antique automobile parts" so the customs guys don't get a bite....
Those screws are actually a super high grade part (equates to a SAE grade 10 or 12) and they are so hard and tensioned so high that split lock washers will not work, they might be past the load limit of Nord-locks. Those also require that they be able to get a bite on the fastener. I did buy hardened washer to go under them because of the load.
Installed correctly at 65~70Lb-Ft they are so close to yield that the chance of them backing out is slim, and they are too hard to drill for safety wire. I thought about get some mash-keepers laser or water cut, but that is so far down my list of things I need to do that I don't expect it to be near the surface any time soon.
Matt
Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
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| Re: Socket size (12 pt) for front axle output hub bolts? [message #367762 is a reply to message #367747] |
Wed, 01 December 2021 14:34 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
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No you do not need a business address to get Mcmaster stuff in Canada.
You order what ever you want and send it to my address and name. I take the package and relabel it as a "antique auto part" less than $40 CDN and forward it to you using USPS/Canada Post. There is a one day delay getting it here out of Chicago and a second day for me to take it to the post office. There are no CDN customs charges or brokerage fees that way.
Ken B.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: Socket size (12 pt) for front axle output hub bolts? [message #367763 is a reply to message #367762] |
Wed, 01 December 2021 15:10 |
blur911
Messages: 166
Registered: December 2020
Location: Kingston, Ontario
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Ken Burton wrote on Wed, 01 December 2021 14:34No you do not need a business address to get Mcmaster stuff in Canada.
You order what ever you want and send it to my address and name. I take the package and relabel it as a "antique auto part" less than $40 CDN and forward it to you using USPS/Canada Post. There is a one day delay getting it here out of Chicago and a second day for me to take it to the post office. There are no CDN customs charges or brokerage fees that way.
Ken B.
Thanks guys. Looks like Brafasco, a local industrial supplier, can get them for me at a good price, should be here in a few days.
I might take you up on that re-shipping thing someday though, you never know, so thanks again.
Burl Vibert
Kingston, Ontario
1976 GMC 26 foot, Sheridan reno, don't know original model but we call her Roxie
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| Re: Socket size (12 pt) for front axle output hub bolts? [message #367764 is a reply to message #367763] |
Wed, 01 December 2021 16:30 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
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Any time. Just send me note or PM. I have sent a lot of relay mail for people. The largest was a GMC steering column. On rare occasion if I am headed to Canada, I drive it across the border and drop it in Canada Post.
Ken B.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: Socket size (12 pt) for front axle output hub bolts? [message #367765 is a reply to message #367763] |
Wed, 01 December 2021 16:32 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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Any time. Just send me note or PM. I have sent a lot of relay mail for people. The largest was a GMC steering column. On rare occasion if I am headed to Canada, I drive it across the border and drop it in Canada Post.
Ken B.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| [GMCnet] Re: Socket size (12 pt) for front axle output hub bolts? [message #367771 is a reply to message #367765] |
Wed, 01 December 2021 22:44 |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
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We notice that the bolts on the driverside is the one that seem to loosen
up so we always use the Blue Loc tite.
That is the side that connects directly to the Spider gear that can vibrate
more.
We deal with Imperial Supply as they supply shops at best prices and have
the assortment.
Only bolts they can supply is one with the 3/8 socket head, no more 7/16
On Wed, Dec 1, 2021 at 3:08 PM Ken Burton wrote:
> Any time. Just send me note or PM. I have sent a lot of relay mail for
> people. The largest was a GMC steering column. On rare occasion if I am
> headed to Canada, I drive it across the border and drop it in Canada
> Post.
>
> Ken B.
> --
> Ken Burton - N9KB
> 76 Palm Beach
> Hebron, Indiana
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
>
--
Jim Kanomata ASE
Applied/GMC, Newark,CA
jimk@appliedairfilters.com
http://www.gmcrvparts.com
1-800-752-7502
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Applied/GMC
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1-800-752-7502
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| Re: Socket size (12 pt) for front axle output hub bolts? [message #367803 is a reply to message #364980] |
Fri, 03 December 2021 12:16 |
blur911
Messages: 166
Registered: December 2020
Location: Kingston, Ontario
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Since there is lots of clearance in there, is there anything wrong with using a regular hex head cap screw?
https://www.amazon.com/Bolts-Screws-Plating-Thread-Diameter/dp/B07CQ8ZGFZ
3/8-24 x 1 1/4 Hex Head Bolts, Steel Grade 9 Hex Head Cap Screws, Steel, Eco Guard Plating, Part THD Fine Thread, Diameter: 3/8 inch, Length: 1 1/4 inches, Thread Length: 1 inches
Hex Cap Screw Grade 9
Steel Ecoguard 1000 Hour Salt Spray - Gray/Silver Finish
Coarse Thread – Made in U.S.A.
Manufactured from 8647 /8640 /8740 Medium Carbon Alloy Steel
Tensile Strength: 180,000 psi. min,
Burl Vibert
Kingston, Ontario
1976 GMC 26 foot, Sheridan reno, don't know original model but we call her Roxie
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| Re: Socket size (12 pt) for front axle output hub bolts? [message #367804 is a reply to message #367803] |
Fri, 03 December 2021 12:33 |
blur911
Messages: 166
Registered: December 2020
Location: Kingston, Ontario
Karma: 4
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blur911 wrote on Fri, 03 December 2021 12:16Since there is lots of clearance in there, is there anything wrong with using a regular hex head cap screw?
https://www.amazon.com/Bolts-Screws-Plating-Thread-Diameter/dp/B07CQ8ZGFZ
3/8-24 x 1 1/4 Hex Head Bolts, Steel Grade 9 Hex Head Cap Screws, Steel, Eco Guard Plating, Part THD Fine Thread, Diameter: 3/8 inch, Length: 1 1/4 inches, Thread Length: 1 inches
Hex Cap Screw Grade 9
Steel Ecoguard 1000 Hour Salt Spray - Gray/Silver Finish
Coarse Thread – Made in U.S.A.
Manufactured from 8647 /8640 /8740 Medium Carbon Alloy Steel
Tensile Strength: 180,000 psi. min,
I just took a closer look and answered my own question, it would be dicey to find a socket thin enough to fit a hex-head cap screw.
Burl Vibert
Kingston, Ontario
1976 GMC 26 foot, Sheridan reno, don't know original model but we call her Roxie
[Updated on: Fri, 03 December 2021 12:33] Report message to a moderator |
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