906 Cam Nuts

[chris_seven]

I know that the thread pitch on a 906 cam is 1.5mm instead of 2.0mm on a standard cam.

I suspect that the thread is an M30 rather than an M27 which is standard.

Does anyone have a definitive measurement please

[Flat6pac]

I did RSR cams last year and the nut was a 42mm fine thread, never saw it before.
Bruce

[chris_seven]

I thought that the RSR cam nut was 42 Across Flats and a 1.5 pitch. There are replicas being made with 46AF nuts to allow the use of standard Crow's Foot.

The size I am missing is the nominal diameter of the thread.

I have found another comment that suggests that the thread is M28 x 1.5

[Jon B]

The nuts were 41mm across the flats, not 42mm.

Chris, I don't believe the nuts were M30, because the chain sprocket ID is 30mm, and I don't recall the threads being the same diameter as the sprocket journal on the cam.

[chris_seven]

Originally Posted by Jon B

The nuts were 41mm across the flats, not 42mm.

Chris, I don't believe the nuts were M30, because the chain sprocket ID is 30mm, and I don't recall the threads being the same diameter as the sprocket journal on the cam.

Thanks- I have a pair of genuine 906 cams but they are away being reproduced and the guy making the blanks has gone on holiday for 2 weeks and I wanted to start on making the nuts.