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Discussion Starter · #1 ·
Trying to find a place locally if possible or online that would sell a hex key to fit a 4-40 screw. Any ideas? Local hardware didn't have it.

edit: FWIW, I got a 4mm key from the hardware store and it wouldn't fit snug. Close but no cigar. I thought this was the right size though.
 

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You should be able to find one anywere.. Buy a whole set of them, all the sizes will come in handy some day, plus there not expensive..
 

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A 4-40 allen takes a very small hex key, somewhere around 3/32" IIRC, much smaller than 4mm, which is about 5/32".
 

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Discussion Starter · #6 ·
mike26038 said:
You should be able to find one anywere.. Buy a whole set of them, all the sizes will come in handy some day, plus there not expensive..

I've got a pretty big set and none of them fit. I don't know if its a full set but there is quite a few.
 

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Discussion Starter · #7 ·
I talked with a lady at Mcmaster.com and she said I'd need a 1/16'' hex key. I'm going to stop by the hardware store this evening and see about this size.
 

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Hex key

Hes right I remember the days when I raced RC cars and the electric motors used 4-40 set screws to hold the pinion gears in place...Hobby shop most definitely!
 

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Discussion Starter · #9 ·
AK74FAN said:
Hes right I remember the days when I raced RC cars and the electric motors used 4-40 set screws to hold the pinion gears in place...Hobby shop most definitely!

Went to Lowes and pulled the first full set of keys and the 1/16'' worked great in my 4-40 cap screw. I'm pretty sure this is the right size guys. Thanks for all the help.
 

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I purchased the Chapman sets for both blade screws and allens. It comes in nice plastic containers and has just about every allen and hollow ground (gun screws) screw bit you need.

Oh, the above is not for deep set screws or allens. They have been a real life saver when taking guns apart. A little more costly than just buying one or two allens but they'll save you from going and buying one everytime you need a differnet one.
 

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