Author Topic: Dodgy Hex Key  (Read 3709 times)

Offline Danny M2Z

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Dodgy Hex Key
« on: September 17, 2013, 02:09:08 AM »
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 *



Measure twice - cut once. You can't put it back!

Offline tel

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Re: Dodgy Hex Key
« Reply #1 on: September 17, 2013, 04:02:02 AM »
Yeah, you do need to check stuff from Mr. B's Emporium - mostly OK, but now and then .....
The older I get, the better I was.
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Offline sshire

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Re: Dodgy Hex Key
« Reply #2 on: September 17, 2013, 04:49:25 AM »
It's correct. Their tolerance is +- 2mm.
Best,
Stan

Offline derekwarner

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Re: Dodgy Hex Key
« Reply #3 on: September 17, 2013, 07:32:29 AM »
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
Derek Warner - Honorary Secretary [Retired]
Illawarra Live Steamers Co-op - Australia
www.ils.org.au

Offline tel

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Re: Dodgy Hex Key
« Reply #4 on: September 17, 2013, 07:40:28 AM »
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.
The older I get, the better I was.
Lacerta es reptiles quisnam mos non exsisto accuso nusquam

Offline mcostello

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Re: Dodgy Hex Key
« Reply #5 on: September 17, 2013, 04:51:11 PM »
I doubt anyone in China has a red face over anything they do. They figure We are foolish enough to buy their stuff. (Got my share also.) :'(

Offline tel

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Re: Dodgy Hex Key
« Reply #6 on: September 17, 2013, 09:26:30 PM »
... more likely having a quiet chuckle over it in a corner somewhere.  ;)
The older I get, the better I was.
Lacerta es reptiles quisnam mos non exsisto accuso nusquam

Offline Noitoen

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Re: Dodgy Hex Key
« Reply #7 on: September 17, 2013, 09:29:16 PM »
You have it wrong. 4mm on the handle means it's for 4mm screws :cheers:

Offline tel

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Re: Dodgy Hex Key
« Reply #8 on: September 17, 2013, 09:34:29 PM »
I've never seen allen keys designated that way - for starters while the 3mm key will fit an M4 cap screw, it won't fit an M4 c/s screw.
The older I get, the better I was.
Lacerta es reptiles quisnam mos non exsisto accuso nusquam

Offline Noitoen

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Re: Dodgy Hex Key
« Reply #9 on: September 17, 2013, 09:51:47 PM »
Just kidding ;)