Upgrading studs from 1/2 inch to 7/16 on the car
03-09-2006, 08:57 AM
#1
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Upgrading studs from 1/2 inch to 7/16 on the car
I wanted to upgrade my wheel studs from 7/16 to ½ inch and I didn’t want to remove the spindles from the car. I was using a stud from Morosso with a .615 knurl and the stock stud holes need to be drilled out.
With a hand drill there is no way of keeping the new holes square with the flange so I made a fixture .
It was made from a piece of 1 inch diameter by about 3 inch long round stock and a piece of 1 ½ by ¼ inch by 3 inch flat stock. The 2 pieces are welded together.
After welding the two pieces are put in a lathe and the hole is drilled in the round and flat stock and then the flat stock is faced off to the hole and bottom of the fixture is at right angles to each other.
A locater pin is also required so the fixture can be accurately place over the hole.
For a locater I turned a piece of ¾ inch round stock down to fit inside the fixture and a smaller end that fits in the existing hole in the spindle after the stud is punched out.
I do NOT run dust shields. On the rear on the drivers side at the 9 oclock position a stud can be driven out, the fixture clamped over the hole with a pair of c clamps, a hand drill used the drill the new hole and a full 3 inch long x ½ inch morosso stud installed. There is room without the dust shield.
ON the passengers side it is at 3 oclock.
If the stud has a .615 knurl and that is common you have a choice of a 19/32 drill or .594 diameter hole or a 39/64th or .609 hole. I would try the .594 hole first and see if a stud would pull in. If not go for the 39/64 hole and a .006 press fit.
I don’t remember which I used since I have all the drills in the shop and don’t remember which I used.
Place the locater pin in the fixture, insert the small end of the locater in the existing hole and using clamps secure the fixture to the hub, remove the locater and drill with a hand drill.
Both of the above drill bits will work.
Good luck
This is a picture of the fixture
With a hand drill there is no way of keeping the new holes square with the flange so I made a fixture .
It was made from a piece of 1 inch diameter by about 3 inch long round stock and a piece of 1 ½ by ¼ inch by 3 inch flat stock. The 2 pieces are welded together.
After welding the two pieces are put in a lathe and the hole is drilled in the round and flat stock and then the flat stock is faced off to the hole and bottom of the fixture is at right angles to each other.
A locater pin is also required so the fixture can be accurately place over the hole.
For a locater I turned a piece of ¾ inch round stock down to fit inside the fixture and a smaller end that fits in the existing hole in the spindle after the stud is punched out.
I do NOT run dust shields. On the rear on the drivers side at the 9 oclock position a stud can be driven out, the fixture clamped over the hole with a pair of c clamps, a hand drill used the drill the new hole and a full 3 inch long x ½ inch morosso stud installed. There is room without the dust shield.
ON the passengers side it is at 3 oclock.
If the stud has a .615 knurl and that is common you have a choice of a 19/32 drill or .594 diameter hole or a 39/64th or .609 hole. I would try the .594 hole first and see if a stud would pull in. If not go for the 39/64 hole and a .006 press fit.
I don’t remember which I used since I have all the drills in the shop and don’t remember which I used.
Place the locater pin in the fixture, insert the small end of the locater in the existing hole and using clamps secure the fixture to the hub, remove the locater and drill with a hand drill.
Both of the above drill bits will work.
Good luck
This is a picture of the fixture
03-09-2006, 09:36 AM
#3
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Originally Posted by Batsy74
Looks like it will work slick! 
Noticed it too late to change the title.
It's in the mail
Last edited by norvalwilhelm; 03-09-2006 at 09:44 AM.
03-09-2006, 09:45 AM
#5
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Originally Posted by Twin_Turbo
That's a nice fixture...It's strangely familiar to the one I have....down to the quickie red paintjob 
03-09-2006, 10:15 AM
#6
Race Director
If anyone is interested I have a brand new set (20pcs) of 1/2" X20 thread-7/8 hex x 2.5" long SCCA/Trans-Am style lug nuts for aftermarket wheels (shoulder style)...made of stainless steel. e-mail direct!! redvetracr@msn.com
03-09-2006, 01:01 PM
#8
Melting Slicks
Noval - you're the "Norm Abrams" of Corvettes.... : If you have never seen the show on PBS, this woodworking guy (Norm) has every tool imaginable in his shop and he can make anything...........
: If you have never seen the show on PBS, this woodworking guy (Norm) has every tool imaginable in his shop and he can make anything...........