info on Nut for Center Lock Wheels

[abc123]

need to know the thickness of the nut used on center lock wheels,,, (917,935) type cars the how wide is the flat, if you know the distance from flat to flat and the ID of the center hold and a good photo would also help

[tadman]

The inside dimension of the nut is 69.25 mm. outside dimension on the round area which goes up against the wheel is 109 mm and the outter dimension of the nut itself is 90 mm. There is a driver side # 09.21.046 and passenger side
#09.21.047, thats because passenger side centerlok is reverse thread.

[tadman]

forgot to mention depth of nut 46.25mm, thats from top of nut to bottom of recessed area which goes up against the wheel itself. These were the centerloks used on some 73 rsr, 74 rsr turbo, 934 and 935 and as for the 917 it looks to be the same setup but somebody with more knowledge may want to chime in as to which cars had this same setup.

[tadd]

These are avaiable from BBS for <$90. Not really worth making, IMHO. You'll need the taper angle too to do it right. The thread is an M72. The pitch seems to be 2.5 mm, which is, of course, weird. I haven't been by Maryland metrics yet to verify.

tadd