Help! > Mistakes, muckups, and dangerous behaviour
Dodgy Hex Key
Danny M2Z:
G'day.
I found a set of long T handled metric hex-keys at a well known Australian hardware store.
Just what I needed for fiddly screws as they had a ball end. Now at the price I did not expect fantastic quality, but I did expect them to fit a socket head screw.
The first screw I needed to tighten had a 4mm socket, but the key just spun in the hole.
Out with the measuring gear. Oop's, somebody at the factory in China must have a red face!
* Danny M *
tel:
Yeah, you do need to check stuff from Mr. B's Emporium - mostly OK, but now and then .....
sshire:
It's correct. Their tolerance is +- 2mm.
derekwarner:
Something is not KOSHA here :ShakeHead: ....according to ISO
...an M5 SHCS has an inhex AF or W dimension of 4 mm......
...an M4 SHCS has an inhex AF or W dimension of 3 mm....so a measurement of 2.98mm for the corresponding hex driver key size is acceptable
When one purchases a hex key set.... :Director: are they not based on the AF sizing?........which has little to do with the thread sizing designation :facepalm: .....Derek
tel:
Yes. Allen keys are designated by the a/f size - here we have an acceptable 3mm key branded as a 4mm, which is clearly not acceptable.
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