Picture of How to remove an oversized Allen Bolt...anywhere!
If you've ever been like me, looking at what appears to be the biggest Allen Bolt ever made while realizing the largest wrench in your tool kit is only good enough to fix a pair of sunglasses, you might think you're a tad bit hosed.

Never fear! Here's a quick and dirty solution.

Step 1: Get a bolt and 2 nuts

Picture of Get a bolt and 2 nuts
The trick is to either buy, or dig through your piles of bits and pieces, and get a bolt whose head is either the same size as your Allen bolt, or slightly larger, and 2 corresponding nuts.

* If you're dealing with a car or motorcycle, there's a pretty good chance you'll find one of these suckers holding useless things together, like shocks or fuel pumps.

Now that you have your bolt, make sure it fits. If you've got an oversized one, just file or grind it down to fit.
LynxSys1 year ago

Am I the only one who's now headed off to the hardware store to buy a full set of rod coupling nuts for this use? I can't justify a full set of giant hex bit sockets for my ratchet, but a handful of coupling nuts seems downright sensible!

eyesee2 years ago
ffgrif2 years ago
I needed a 14mm Allen wrench and bought a 9/16, then turned it down on the CNC. Some times you kick yourself thinking, "I didn't I think of something so simple?!" This is a great idea. I hope I remember it next time... Thanks!
DoDo7293 years ago
Brilliant, so simple, yet so smart. Thanks great tip
mysss3 years ago
Ah, this could come in handy. LOL at. "useless things like shocks or fuel pumps"
Great Idea!
The only problem is that these big screws are often glued an very well tight.
Last time I tried to open one of these(inside a hydraulic motor, so, not rusty and lubrificated) It broke not only the screw as the real allen key itself, so, only works sometimes.
static3 years ago
An old trick, but old tricks are worth repeating, because new DIY persons at coming on the scene all the time. With a welder available use short bolt with all threads spin on a single nut weld the nut to the bolt. Or drill a hole near the end of a length of strap metal stick the bolt through weld the bolt that comes through the strap to the strap. Pretty it up put it the tool box for the next time. When I worked in the oil field I carried many specialized shop built tools on the truck
adunster3 years ago
Great idea, thanks!
DEDELIE3 years ago
Bravo pour l'astuce ! Il suffisait d'y penser en effet.
bahi3 years ago
We should post instructables about basics or tricks like this more often, sometimes they can be very very useful.
as times get tough, we need to get back to some old ways of doing things.
-like snoop said, Every penny counts.
You're right man!
fallis3 years ago
Another cheap option is to buy a coupler in the size of the allen head, and put a socket on the other end. I've been in a situation (removing a Suzuki wheel axle) where the bolts + 2 locking nuts trick wouldn't work and it took all day to figure out that I could buy a $3 part at the hardware store and have it handled in seconds.

The right size allen wrench is always the best option, but they're often expensive and special order. In a pinch the coupler works great.

Oldbear3 years ago
" If you're dealing with a car or motorcycle, there's a pretty good chance you'll find one of these suckers holding useless things together, like shocks or fuel pumps."

You big meanie... whiskey came out my nose when I read this one...
polcipalma3 years ago
Nice way to solve the problem. Twin nuts do a lot of tricks like this one.
But in this case take extreme care: Cheap bolts and nuts are made with different steel as a proper big Allen key, and you can damage yourself or the piece you're working on if it breaks as you force it.
Nice anyway!
thor743 years ago
un genio,buenisima tu idea muchas gracias
MajHunter3 years ago
Wow. That is amazingly simple, yet quite brilliant.
pyletfly3 years ago
Excellent idea my friend, thank you for sharing this. I will be putting this to good use.
rickster4543 years ago
desperate men do desperate things-!
=////=======> I used 51-62 ==> 6 cylindar Chevy ignition points in My Ol' 52 Pan Head, and 63 + - Ford Fairlane U-Joints in My Ol' 68 Ford F-100 4/4. Every penny counts.
actimm3 years ago
Another trick is to use those long nuts you find at hardware stores for joining two bolts together. It works better than just double nutting when the cap is really stuck in. Of course, if you are going to the hardware store, maybe you can just find the wrench. I've had to use both methods to taking the shocks apart on my Virago a time or two.
brojer3 years ago
won't this damage the hex insert? 14MM hex wrench is not that expensive.
spring973 years ago
I did something similar for a one-time use by using a longer bolt and bending the shank at a right angle. However, I like your reusable approach better.
spizzak3 years ago
Just had to run to my toolbox and grab this for a picture:


Great instructable... making a tool here and there has saved me quite a bit of time and money while working on my bikes!
f5mando3 years ago
Excellent! Thanks for sharing!
danzo3213 years ago
Huhh! My old Fiat Spyder needed a large allen wrench to drain the oil.. Fiat is long gone, still got the big wrench.
I remember the guy at Sears showing me how a 12-pointed socket could capture the square drainplug on a steering box.
Another option depending on the situation is to file flats either side of the threaded section and put it in a vice.
A great idea that will save some money and frustration. Thanks for sharing.
Quick-tune3 years ago
Good one, another way is to fix the bolt in the end of a steel tube either by welding, or by drilling through the tube and bolt and pinning through ... some people will know this from servicing Kawasaki LTD forks (used to hold the damper tube inside from turning)
bobelon3 years ago
I have faced this problem numerous times. For me the easiest thing to do is to grab a long bolt with a 14mm head, stick it in a vice and wack it till you have about a 90degree bend near the head of the bolt. Simple and quick.
cod3hack3r3 years ago
Nicely done, way to improvise, ill remember this next time im stick with one of these
caarntedd3 years ago
I've done this before. Nice Tip. (Damn! I could have made this instructable!)
Flying Ace3 years ago
This is one of those "now why the hell didn't I think of that" moments...
Thanks for sharing...
TrevorD7773 years ago
That is one hell of a great tool to know about in those "Where-the-F@%K-is-it" moments (I have a lot of those). 5 thumbs up to you Mr irmiger.