Woodruff Key for 914-6 Bosch Generator Options

[DennisV]

Can someone tell me what the correct part number / size is for the woodruff key used to secure the fan to a 914-6 Bosch 770W generator? The part is not identified in the catalog.

I had information suggesting it was N-012-710-1 4 x 6.5 mm for '65-77 911. I have tried to install the Porsche supplied part a few times and it is certainly too tall.

None of the alternates I find from the normal suppliers list this use for their woodruff key offerings. Trying to measure the opening in the shaft and the fan, my best guess is it wants 4 x 5.

Thank you.

[sixnotfour]

Here is a double check..
Bosch 914-6 alt.. Key that was in it..
height ,,flat to radius= 4.93 mm
length,,point to point= 12.45 mm
width,, = 3.98 mm

[DennisV]

Here is a double check..
Bosch 914-6 alt.. Key that was in it..
height ,,flat to radius= 4.93 mm
length,,point to point= 12.45 mm
width,, = 3.98 mm

Thanks for this datapoint. It aligns with what I measured in the shaft and fan hub.

I may regret it later, but I bought the assortment from Harbor Freight. The 4 x 5 went in like I expected. Progress...