M33x3.5 bolts or threaded rod

[Hugh]

Hi there,
I have been looking for some M33x3.5 threaded rod or bolts. Can't seem to find any. Does anyone know where one could purchase such a beast?

I want to make a threader for boxes and my lathe is that size and I want to be able to mount my chuck on this threaded rod. Worst case is that I have to purchase a threading die and make my own. There should be some bolts out there or threaded rod. I have tried MSC, Enco, McMaster-Carr, and have Googled it. No luck.

Next question is - to the machinests out there - Is this something that is easy to make on a metal lathe?
Thanks.
Hugh

 

[Joe Greiner]

Unless the standards have been updated (entirely possible), M33x3.5 is off specification, and will likely be hard to find - at least until manufacturing catches up.

M30x3.5 is standard, though, so any lathe with appropriate change gears can handle it; just use larger material to begin with.

I'm not a real machinist, BTW, nor do I play one on television or in the movies; but I have stayed at Holiday Inn Express.

Best of luck,
Joe

 

[Frank F]

Try Fastenall at the link below. You may have to order online.

http://www.fastenal.com/web/products.ex?searchValue=33mm+x+3.5&Ntt=33mm+x+3.5&Ntk=Search+All&Ntx=mode+matchallpartial&Ntpc=1&N=999600003+1199944581&Nty=0

Good luck,
Frank

 

[John King]

Fastenal

Here are the FASTENAL part numbers:

M33x3.5 DIN 934 PL CL10 Course Thread Finished Hex Nut
Sku = 90718

M33x3.5 DIN 934 Plain Finish Course Thread Finished Hex Nut
Sku = 40135

 

[John King]

M33x3.5

Joe - What makes you think that M33x3.5 is off specification?

It's standard on the big Oneway lathes. Hard for me to believe that Oneway is using an off specification thread on their spindles.

And the mail order cataloges are full of chucks, adapters, etc. with M33x3.5 threads.

Appreciate and look forward to response. - John

 

[Joe Greiner]

As I said, "Unless the standards have been updated (entirely possible)." My copy of Machinery's Handbook is 24th Edition, ~1992. Time for replacement, I guess.

 

[Frank F]

Joe - What makes you think that M33x3.5 is off specification?

It's standard on the big Oneway lathes. Hard for me to believe that Oneway is using an off specification thread on their spindles.

And the mail order cataloges are full of chucks, adapters, etc. with M33x3.5 threads.

Appreciate and look forward to response. - John

When I was looking for a 33mm x 3.5 nut, I had trouble finding that size. I checked several vendors. Their threaded metric stock went from 30mm to 35mm. Then I checked Fastenal. The 33mm x 3.5 appears not to be a common standard. I'd be interested if anyone has more info on this as I'm not a machinist.

Frank

 

[Joe Greiner]

It took about 150 years to develop Unified Screw Thread systems, so that nuts and bolts would assemble properly. Metric and Imperial developed along separate tracks. Neither system is natural per se, and each has preferred increments of diameter and pitch, in its own units of measurement. Each also has some odd-balls to refine choices, subject to available tooling.

A metal lathe has a gearbox to control the rotation of the lead screw, which moves the thread cutter to define the pitch. Some of the gears can be swapped around for different pitches. In general, a metric lathe can't cut Imperial pitches, except for a few happy coincidences, and vice-versa. Gears, of course, must have an integral number of teeth; friction drive not allowed.

1 inch = 25.4 mm, if you want to play with the arithmetic.

 

[Hugh]

Hi there,
Thanks everyone for the answers. I think the M33 x 3.5 is an odd ball size just due to the lack of availability of bolts in that size. I Googled M33 x 3.5 and it was fairly easy to come up with nuts at a reasonable price. But, bolts and threaded rod is hard to find and expensive when you find someone that carries it. I think $45 - $60 for a bolt that is basically an 1 1/4" + bolt is a lot to pay. Enco has a threading die for the thread for $65 and that may be the way to go. That is if I can find the proper size steel rod to thread. Maybe I can find a chunk of brass rod the proper diameter. It would be easier to thread.
Anyway, Thanks for the answers.
Hugh

 

[john lucas]

Actually 1 1/4x8 is also a non standard size. 1 1/4x7 is standard. 1 1/4x8 is a special thread to designate nuts and bolts that are stronger than the usual 1 1/4x7. I'm not sure why lathes started using that instead of 1 1/4x7 but they did.