Drilling hubs and drums for MT drums...

[PeteVS]

I bought a pair of MT drums and I need the drill sizes needed for the hubs and drums for the new longer studs. I should have them somewhere but it would take forever to find the info. This would be for '40 hubs on the rear. Thanks!

[Andy]

Do the studs have the id numbers on them? I used the Speedway drums and used 610-109 studs. They fit the drums.

[john in illinois]

Pete,the studs press into the hub and have a shoulder that fits in the drum. The holes in the drum are the right size. Inhave always used their hubs,so I do not know size to drill. Someone may know or givea call to MT.

The drums do not get swaged.
John

[cas3]

measure the smooth part on the stud, and drill a hole that size. the splines will "broach" they're way in. do a test hole on some steel and check the fit. use a press to install, and check them often when you start driving it.

[rotorwrench]

There should be holes already. Most are already the correct tight fit. If they did need to be resized, it would likely need to be reamed to a proper fit. Drills are not an accurate way to resize and not all reamers are either. I used specific size non adjustable reamers for this type of stuff otherwise it goes in the mill. If they are outy type drum/hub set ups, a person can use the press in studs for the hub only and fit up the drums like a modern set up as was mentioned.

[1931 flamingo]

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If you're swedging the studs to the drums, in the Model A "world" they recommend no less than a 40 ton press.
Paul in CT

[mrtexas]

Talk to MT. They recommend drilling then reaming to dimension. They are modern studs and not installed like the old fashioned ones.

[John R]

For the 40 rear hubs, the existing holes need to be very accurately drilled and reamed to .600"diameter. Use the Dorman 610-234 stud (Raybestos 5351B). The knurl on this stud is a bit long and could be shortened .060 if you are seeking perfection, but they seem to work fine without modification. As mentioned, you could also use the 610-109 stud - the knurl on it is the correct length but a bit larger in diameter than the 234 stud. I haven't used the 109 stud so don't know if it might require reaming the hole a bit larger than .600" to get a proper press fit.

[PeteVS]

Originally Posted by John R

For the 40 rear hubs, the existing holes need to be very accurately drilled and reamed to .600"diameter. Use the Dorman 610-234 stud (Raybestos 5351B). The knurl on this stud is a bit long and could be shortened .060 if you are seeking perfection, but they seem to work fine without modification. As mentioned, you could also use the 610-109 stud - the knurl on it is the correct length but a bit larger in diameter than the 234 stud. I haven't used the 109 stud so don't know if it might require reaming the hole a bit larger than .600" to get a proper press fit.

Thanks John!