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Allen key size problem #5029624 03/02/19 08:40 PM
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vavavroom Offline OP
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I need to loosen M2 hex head screw. None of my Allen bits fits. 1.27mm is too small, 1.5mm is too big, I really don't feel like sanding a 1.5mm bit down to fit. I am not aware of any intermediate size.

Re: Allen key size problem [Re: vavavroom] #5029636 03/02/19 08:50 PM
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Chris142 Offline
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Have you tried an sae hex key?


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Re: Allen key size problem [Re: vavavroom] #5029638 03/02/19 08:54 PM
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Langanobob Offline
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Or try a Torx bit.

Re: Allen key size problem [Re: vavavroom] #5029661 03/02/19 09:33 PM
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spasm3 Offline
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If sae does not fit , hammer a robertson bit in.


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Re: Allen key size problem [Re: vavavroom] #5029739 03/03/19 12:16 AM
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user52165 Offline
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Originally Posted by vavavroom
I need to loosen M2 hex head screw. None of my Allen bits fits. 1.27mm is too small, 1.5mm is too big, I really don't feel like sanding a 1.5mm bit down to fit. I am not aware of any intermediate size.


7/128 = 1.43mm Not sure that SAE is made.

This is where a high quality item made to tight tolerances is needed. I suspect yours is not, or the head, is buggered up. Probably 1.5. The other posts are good also.

Bondhus ball types are all I use.

Last edited by user52165; 03/03/19 12:18 AM.
Re: Allen key size problem [Re: user52165] #5029753 03/03/19 12:49 AM
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CR94 Offline
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Originally Posted by user52165
...or the head, is buggered up. Probably 1.5. The other posts are good also. ...
Exactly. Check for burrs at the entrance of the hole in the screw, or at the tip of your hex key.

Last edited by CR94; 03/03/19 12:50 AM.

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Re: Allen key size problem [Re: vavavroom] #5029767 03/03/19 01:17 AM
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jhellwig Offline
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If you are trying a ball end use a regular one. Ball ends don’t have as much grip area.


Sparks fly from my fingers.

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Re: Allen key size problem [Re: vavavroom] #5029780 03/03/19 01:56 AM
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gaijinnv Offline
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M2 spec is 1.3mm. Many available: 1.3mm at Ace Hardware

HTH


USN NAVSECGRU 1970-1974
Re: Allen key size problem [Re: vavavroom] #5029871 03/03/19 07:27 AM
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Imp4 Offline
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An M2 SHCS should accept a 1.5mm he Allen key per DIN 912 & ISO 4762.

Attached PDF document
1-32.pdf (44.11 KB, 25 downloads)

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Re: Allen key size problem [Re: Imp4] #5029987 03/03/19 09:31 AM
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gaijinnv Offline
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Originally Posted by Imp4
An M2 SHCS should accept a 1.5mm he Allen key per DIN 912 & ISO 4762.



For a socket head screw you are correct, but OP does not have a socket head screw. Applicable standard is ISO 7380 which specifies 1.3mm for M2.

[Linked Image]

HTH


USN NAVSECGRU 1970-1974
Re: Allen key size problem [Re: gaijinnv] #5030230 03/03/19 01:02 PM
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Imp4 Offline
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Originally Posted by gaijinnv
Originally Posted by Imp4
An M2 SHCS should accept a 1.5mm he Allen key per DIN 912 & ISO 4762.


For a socket head screw you are correct, but OP does not have a socket head screw. Applicable standard is ISO 7380 which specifies 1.3mm for M2.
HTH

'ISO 7380- Hexagon socket button head screws' is button head screws just like you have illustrated.

OP states:
Originally Posted by vavavroom
I need to loosen M2 hex head screw.

He does not specify socket head or button head...
I guess we'll need OP to clarify exactly what he has/needs...
cheers


2001 Mitsubishi Galant 2.4 - 165k+
Grandma's creampuff...
Re: Allen key size problem [Re: vavavroom] #5030852 03/03/19 11:44 PM
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red7404 Offline
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IMHO. this is where you buy the cheapest tools you can find. and mod them to your harts content

Re: Allen key size problem [Re: Imp4] #5031137 03/04/19 09:28 AM
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gaijinnv Offline
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'ISO 7380- Hexagon socket button head screws' is button head screws just like you have illustrated.

OP states:
Originally Posted by vavavroom
I need to loosen M2 hex head screw.

He does not specify socket head or button head...
I guess we'll need OP to clarify exactly what he has/needs...
cheers

I completely agree cheers

Last edited by gaijinnv; 03/04/19 09:29 AM.

USN NAVSECGRU 1970-1974
Re: Allen key size problem [Re: vavavroom] #5031379 03/04/19 01:09 PM
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lyle Offline
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Lordy, oh lordy, he says he has a HEX HEAD SCREW. No wonder his Allen bits don't fit, he needs a box end or open end wrench.

Now if he had a hex socket screw that would be different, but he needs to specify head type.

Re: Allen key size problem [Re: vavavroom] #5031657 03/04/19 05:29 PM
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EdwardC Offline
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We should probably check if his name is even Allen.

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