Thread Size - Front Spindle 1968
Thread Starter
Melting Slicks
Joined: Jun 2009
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From: Anderson SC
Thread Size - Front Spindle 1968
Hi!
Two questions please?
1) What is the thread size of the front spindle nut on a 63-68?
Secondly... what is the thread size of the Spindle Dust Sheild Upper Mount Bolts? I ordered 2 new bolts.. but the threads in the blind hole are a little bungfe up and I want to chase them with a tap.
-W
Two questions please?
1) What is the thread size of the front spindle nut on a 63-68?
Secondly... what is the thread size of the Spindle Dust Sheild Upper Mount Bolts? I ordered 2 new bolts.. but the threads in the blind hole are a little bungfe up and I want to chase them with a tap.
-W
Race Director
Joined: Oct 2000
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From: Shamong, NJ
1) My Corvette parts book tells me that the front spindle nut for 53-68 is a 3/4"-20.
2) I'm not sure what you mean by "Spindle dust shield upper mount bolts", but if your referring to the bolts that go through the brake backing plates, through the caliper support and into the steering knuckle, they are a 7/16"-20 x 2 1/4" grade 8.
2) I'm not sure what you mean by "Spindle dust shield upper mount bolts", but if your referring to the bolts that go through the brake backing plates, through the caliper support and into the steering knuckle, they are a 7/16"-20 x 2 1/4" grade 8.
Team Owner
Joined: Sep 2006
Posts: 31,301
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From: Westminster Maryland
Hi gb & W,
Isn't there also a single larger diameter bolt at the top that threads into a blind hole in the spindle casting? I know it's there but I can't find the size or thread.
Regards,
Alan
Isn't there also a single larger diameter bolt at the top that threads into a blind hole in the spindle casting? I know it's there but I can't find the size or thread.
Regards,
Alan
Drifting
Joined: Nov 2002
Posts: 1,951
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From: Shore NJ
1) My Corvette parts book tells me that the front spindle nut for 53-68 is a 3/4"-20.
2) I'm not sure what you mean by "Spindle dust shield upper mount bolts", but if your referring to the bolts that go through the brake backing plates, through the caliper support and into the steering knuckle, they are a 7/16"-20 x 2 1/4" grade 8.
2) I'm not sure what you mean by "Spindle dust shield upper mount bolts", but if your referring to the bolts that go through the brake backing plates, through the caliper support and into the steering knuckle, they are a 7/16"-20 x 2 1/4" grade 8.
checked my book also, the bolts going through the brake backing plate to the knuckle are 7/16"-20 x 2 1/4" as mentioned by gbvette....
Thread Starter
Melting Slicks
Joined: Jun 2009
Posts: 2,343
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From: Anderson SC
And I'm surprised it's 3/4 20 on the front spindle, that's the same as the rear spindle isn't it?
-W
Last edited by Clams Canino; Jun 7, 2010 at 09:28 PM.
Le Mans Master
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From: Syracuse NY
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Thread Starter
Melting Slicks
Joined: Jun 2009
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From: Anderson SC
Race Director
Joined: Oct 2000
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From: Shamong, NJ
According to my Corvette parts book, the bolt in dzrick's picture looks to be an 11/16"-16 x 7/8". It's found in Group 5.002 and was part number 3864119. I don't know if it is still available from GM, but I doubt it.
Le Mans Master
Joined: Jun 2005
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From: Syracuse NY
Yep, the front spindle and the rear spindle use the same castle nut. They're found in the Corvette parts book in Group 6.022 and carried part number 378137 (now discontinued). The 69-82 front spindle uses a 27/32"-20 nut.
According to my Corvette parts book, the bolt in dzrick's picture looks to be an 11/16"-16 x 7/8". It's found in Group 5.002 and was part number 3864119. I don't know if it is still available from GM, but I doubt it.
According to my Corvette parts book, the bolt in dzrick's picture looks to be an 11/16"-16 x 7/8". It's found in Group 5.002 and was part number 3864119. I don't know if it is still available from GM, but I doubt it.
Not that I doubted gbvette62, just tried to follow through with my promise to check.
Last edited by DZRick; Jun 8, 2010 at 04:59 PM.
Thread Starter
Melting Slicks
Joined: Jun 2009
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From: Anderson SC
-W
Melting Slicks
Joined: Jul 2001
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From: Massapequa Park NY
My 70 service manual lists two specs which I believe are those bolts.
Caliper housing bolt @ 130 ft. lbs. (from brake section, may be referring to rear brakes)
Brake anchor bolt - disk brakes @ 120 ft. lbs. (from front suspension section - pretty sure this is the one you need)
The brake caliper is listed @ 70 ft.lbs.
I think the spindle, dust shield & rotor were supplied as an assembly.
Hope this helps.
Jim
Caliper housing bolt @ 130 ft. lbs. (from brake section, may be referring to rear brakes)
Brake anchor bolt - disk brakes @ 120 ft. lbs. (from front suspension section - pretty sure this is the one you need)
The brake caliper is listed @ 70 ft.lbs.
I think the spindle, dust shield & rotor were supplied as an assembly.
Hope this helps.
Jim
Last edited by 70BBvert; Jul 11, 2010 at 04:05 PM.
