JHZR2
Staff member
I need to replace a gasket on a diesel injection pump, and the only practical way to get the screws out is to loosen them with a 1/4” hex Allen bit in the right head size for the screw. Bits like this:
For a location like this:
I think it takes a 4mm Allen. A 4.5 or 5mm won’t fit. But a 4mm is loose. I appreciate how important it is to have a tight fit full depth of the Allen into the female end. So my 4mm is no good. I could crack a screw when I tried but one rounded out would be a major issue. It only takes one.
I tried a 5/32, and it fit better. This is a Bosch diesel pump. I doubt the OE screws are imperial. Keep in mind the only bits of this kind I have are from some multi bit sets that were gifted to me long ago.
And, 5/32 = 3.97mm. Yet it fits tighter.
I checked the measurements. The 5/32 is slightly bigger than the 4mm but not really so unless you are looking at tiny fractions of an inch on a dial caliper.
Marginal differences.
So, who makes quality, proper fitting bits of this kind that I can count on?
Any recommendations?
Thanks!
For a location like this:
I think it takes a 4mm Allen. A 4.5 or 5mm won’t fit. But a 4mm is loose. I appreciate how important it is to have a tight fit full depth of the Allen into the female end. So my 4mm is no good. I could crack a screw when I tried but one rounded out would be a major issue. It only takes one.
I tried a 5/32, and it fit better. This is a Bosch diesel pump. I doubt the OE screws are imperial. Keep in mind the only bits of this kind I have are from some multi bit sets that were gifted to me long ago.
And, 5/32 = 3.97mm. Yet it fits tighter.
I checked the measurements. The 5/32 is slightly bigger than the 4mm but not really so unless you are looking at tiny fractions of an inch on a dial caliper.
Marginal differences.
So, who makes quality, proper fitting bits of this kind that I can count on?
Any recommendations?
Thanks!