MG-Cars.info

Welcome to our Site for MG, Triumph and Austin-Healey Car Information.

Parts

MG parts spares and accessories are available for MG T Series (TA, MG TB, MG TC, MG TD, MG TF), Magnette, MGA, Twin cam, MGB, MGBGT, MGC, MGC GT, MG Midget, Sprite and other MG models from British car spares company LBCarCo.

MG MGB Technical - Long wheel studs

Excuse my stupidity but having looked in all the obvious places to find information on this subject, I have no conclusive answers.

I have a clients MGB (Salisbury axle) here for some work. The car is fitted with Minilite replica wheels and an 1/8" spacer (to clear the inner arch). The wheel studs are clearly far too short. I estimate no more than 4 complete threads for location.

Does anyone know of a longer stud which is available...? I do NOT want to fit Metric studs that ARP offer for various GM cars.

Many thanks in anticipation,

Mark.
M T Boldry

Mark -
I have not checked this yet, but I've read that Corvette studs are same thread/dia/knurl, and come in various lengths. So is likely same for many pre-metric GM cars.

Try this:
http://www.summitracing.com/search/?keyword=wheel%20stud&dds=1
You will get a page with a bunch of MFRS of stock replacement and racing studs.

Dorman is major OE replacement company here, so that listing will give you OE applications.

It's maddening, but if you click enough times you can usually find the info - except length many times! OE ones tend not to give it, race ones tend to be 3" OA. The aftermarket/race listings usually give you the knurl size. The Moser Engineering and Moroso listings are good for info. The Summit branded listing is excellent for actual sizes and dimensions.

For ex: If you go to Dorman, click on the blue top header for Dorman 610-138 - Dorman Wheel Studs,
you get: http://www.summitracing.com/parts/RNB-610-138/

Which turns out to fit many GM cars:
Brand Dorman
Manufacturer's Part Number 610-138
Part Type Wheel Studs
Product Line Dorman Wheel Studs
Summit Racing Part Number RNB-610-138

Wheel Stud Style Press-in
Thread Size 1/2-20 RH in.
Quick Start Nose No
Quantity Sold as a set of 10.
Notes Designed to fit Buick 1973-90, Cadillac 1976-90, Checker 1971-82, Chevrolet 1971-90, Chevrolet/GMC 1971-2002, Oldsmobile 1971-90, and Pontiac 1971-89.

The Summit branded listing is excellent for actual sizes and dimensions.
http://www.summitracing.com/search/Brand/Summit-Racing/?keyword=wheel+stud


FRM
Fletcher R Millmore

Mark. Not sure if they are the same, but when I had a ZA Magnette I used studs from a Holden as fitted to a lot of trailers in Oz. Got them from a local trailer manufacturer.

Tony
Tony Oliver

Mark, I have been looking for longer studs here in the UK for a race car, and cannot find any 1/2UNF.
Alot of US cars use 1/2in, so I am going to try a local American specialist to see what he has.
Will post when I have an answer. You might find that banjo axle rears are longer than Salisbury.

Colin
Colin Parkinson

Further to my above:
MGA use 7/16-20 studs; MGB are 1/2-20

Many GM cars also use 7/16-20, so Tony's Holden makes sense. Something like GM (Holden I assume) truck might be a good place to look for 1/2-20 ones.

It is not convenient to remove one right now, but close inspection shows that both MGA & B have 1/2 holes in the hubs, so they are going to be about a .520/.530 knurl.
MGB Salisbury rear are 1.8" OA length, or about 1.7" underhead. It appears to be a countersunk type head. You may have to do a bit of head forming on a lathe to fit other (flat headed) studs, but it should not be difficult. You want to be careful that excess knurl length does not stick through the hub to interfere with brake drum seating, and since these are post heat treat rolled high strength things, I'd be leery of machining the stud shanks if avoidable. Better to redrill the drums if needed, but .520 knurl should not be a problem. After finding the below, it looks like you may have to ream/drill the hubs and drums a bit.

This is the whole Dorman catalog for hardware:
https://www.dormanproducts.com/catalog/2006_hardware.htm

Wheel studs are from pp 135, index here:
https://www.dormanproducts.com/catalog/hardware2006/131-136_Sec10_Part1.pdf
Starting on pp 142 there are actual pictures with dimensions!!

I have to say that with my crappo internet dialup, this has been painful and very very slow!

I need some of these too, shortly. If you cannot find them, let me know and I will get them and mail 'em if necessary. Summit is about 70 miles away from me as last resort.

FRM
Fletcher R Millmore

FRM Tony and Colin, thank you ever so much for your input on this, I am looking at getting some studs that are close in dimensions modified with a correct size knurl and a champhered end. The knurl is only .507" (if I remember correctly).

If these work out I may have a batch done depending on demand... I guess there may be quite a few MGBs out there with Alloy wheels and not realising how little stud /nut contact actually holds them on....!

Mark.
M T Boldry

Mark I have spent a fair amount of time trying to find these studs. The Amercan car specialist has nothing with the knurl that small, and he does have a fair range.
No one here in the UK, as far as I can tell, makes any, including trailer people.
I am going to speak to my local machine shop, to see if he can do some.

Colin
Colin Parkinson

Late Camaro/Firebird/Corvette have the right knurl and are longer but, 12MM, so get the lugnuts also. You probably don't want to do that for just one wheel with the others 1/2". I replaced all of mine as the mag wheels needed different nuts anyway.
JN Jim

Also check Chevy S-10 pickups. (or equivalent).
Rick Ingram

This thread was discussed between 09/04/2010 and 08/05/2010

MG MGB Technical index

This thread is from the archives. Join the live MG MGB Technical BBS now