combat wheel info

[gjamo]

A quick web search reveals many suppliers of BSF wheel studs. Here is just a couple of examples.
They also tell me that Scania trucks use this thread form.
Cheers,
Graeme


http://www.alko.com.au/vehicle/hubs_...tuds_nuts.html

http://www.laxmiautofasteners.com/bolts.html

[Grant Bowker]

Is BSF the same as Whitworth Fine 7/8-14? (don't the Whitworth threads have a 55 degree form instead of the more normal 60 degree?)
The shortest knurl length I saw on the Alko page for 7/8 BSF is 17 mm, much longer than the thickness of the two parts of a CMP rim. But the web sites do make a starting point. At least the wheel half joining threads are all right handed.
See Tony Smith's note on the thread below - I was working from (presumed faulty) memory when I wrote the above.

[Tony Smith]

The thread is on the wheel halves is 7/8-11 aka 7/8 BSF.

And I have also heard that Scania and MAN trucks use this size as wheel nuts.

E-bay UK regularly has listings for BSF and Whitworth taps and dies, so if a wheel stud with a long knurl is available, you could turn down the knurl on a lathe and re-thread it.

And have you contaqcted Dirk at LWD? He may have NOS ones in stock?

[Corey Myronuk]

i have some inquries out to the suppliers in the links you posted.maybe they'll be able to line us up with spares from the India pattern trucks lol.

worst case i'll head over to a friends place,try and get him to cnc us some.
does anyone have any intreest in these or other small parts we can bang out?

if so let me know.


thanks for your responses.

[Bob Carriere]

The stud / nut problem for CMP rims is a problem shared by a lot of us..... if a suitable replacement could be sourced or made with CNC it would be popular.

We have given up trying to find the elusive taps and dies from EBay..... would be nice if someone spots them to post on the For Sale section......

We have numerous rims at the banr that have damaged studs...... some were so rusted....see welded with road salt..... that when we applied heat and the torwue wrench the nuts came off but the thread had "galled" almost smooth on the nut and on the stud.

Our searches for available modern truck wheel studs showed they were not available in the ODD 7/8...... 3/4 and 1 inch were available.

On a 20 inch rim the studs have a mushroom cap and would be more readily removable than the 16 tappered flush welded studs which would require fancy drilling.

I acquired a rolling Ford F15a rolling frame a while back... on all 4 16 inch rim the rim studs had been replaced with large course thread bolts and nuts.... looks weird....but... the bolt head on the back side did not intefere with the rims installation..... we are using them as yard tires for moving frames carcasses.

Boob

[BCBlitz]

So does anyone have actual measurments or pics of a good or NOS one to use as a example ? both for 15cwt and the larger 30 and 60 cwt ?

there has to be a stud out there that would work bot o 15cwt and larger trucks

Now the search is on, I love a challange to find stuff, any more info and pics or measurments would help.

[Grant Bowker]

15 and 30 cwt both used 16 inch rims and to the best of my knowledge, the same studs (almost flush on the innner face). The 60 cwt and FAT used 20 inch that had mushroom headed studs. Feel free to post the dimensions from your best studs for our benefit. When you find a modern source there will be many appreciative CMP owners. Even better if the source has branches in North America, Europe and Australia and elsewhere so we don't have to pay large for shipping, handling, Customs etc.

[Lynn Eades]

BSF is the fine thread as opposed to whitworth which is the coarse British thread. both have a 55 degree included angle.with a rounded valley, and flat crests, while UNC/UNF have a 60 degee included angle, with flat valleys and flat crests. Thats how I understnd it anyway.
On thread forms. A turned thread from a lathe etc, will not be as strong as a roll formed thread (which the originals probably were) because the "grain' in the metal is cut by the lathe tool, whereas the grain in the roll formed thread follows the profile of the thread.
I think many "British Motor Lorries" have used 7/8 BSF threaded wheelstuds.(often 10 stud)

[cletrac (RIP)]

Maybe it's the prairie climate but I haven't come across a stripped or broken stud yet on my collection of CMPs. One rear wheel on the HUP had come off on the previous owner when hauling about 100 bushels of grain and he welded in standard bolts to replace them. I just found another complete hub setup to fix it. The wheel came from Yellowknife (1300 miles away) but you can't let something like that stop you.

[Tony Smith]

Originally Posted by Bob Carriere

The stud / nut problem for CMP rims is a problem shared by a lot of us..... if a suitable replacement could be sourced or made with CNC it would be popular.

We have given up trying to find the elusive taps and dies from EBay..... would be nice if someone spots them to post on the For Sale section......

Boob

Robert Pearce has done just that for you Boobie