SOHC.co.uk Forums > CB350/400

Brake bleeder valve thread size?

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McCabe-Thiele (Ted):
Have you identified the thread size you need on your 400F ?

I am not sure if this is correct, internet search says M8 x 1.25 ??

Update looks like M7

McMaz:
A search for Honda part number '45224-579-013 Brake Caliper Bleed Screw' shows thread size to be M7 (7mm) in diameter.

Mikep328:
So it's either M7 or M8... ?

My measuring of the outside diameter of the 400F bleeder screw thread comes up with 8mm though I'm doing this by eye with a ruler, NOT with a caliper.  I have no way to accurately measure the thread pitch.  Stahlbus has M7 valves in 1mm thread pitch and M8 in either 1 or 1.25 thread pitch.  So, at the moment I have no idea which of the three to order!!!  ;) I'll check if the local hardware store has a bolt/nut thread gauge to  measure the threads..

Yetanotherbike:
If I recall correctly, you can try counting the number of threads over 10 mm.  IE 10mm/8 threads = 1.25 pitch

K2-K6:
As above, can be quantified or could be checked against a "gauge" with the spark plugs being 1.25mm pitch, take the bleed nipple and drop threads into each other to get confirmation if it matches or differs by plus or minus to indicate which pitch you have.

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