How To Break a Kryptonite Keeper Bike Lock

[Hugh R]

My college senior lost both keys to her bike lock and the lock is through the frame of the bike and the wheel. Is a Kryptonite "Keeper" lock with a slot, not a round key. Did a google search and the old ones apparently could be opened with a Bic pen body, not this one. I've got to cut the hardened steel, any suggestions?

[slodave]

Liquid Nitrogen and a hammer... Don;t know how to get those open.

[many944s]

I am not familiar with the name brand... Is it a standard single side key lock? If so, it can easily be picked. If it is a double side key, it would take a little more work, but can still be picked by a decent locksmith.

-Nick

[Joeaksa]

A dremel tool and a cutting wheel do it fine, or like Dave said, liquid nitrogen and a hammer.

I would use a die grinder or something with a 4" or larger cut off wheel. Would be through that in about 30 seconds.

[Zeke]

Not everyone has liquid N on hand. Any grinding disc will go through it like butter. The thinner the disc, the better. Even a Dremmel will work.

[Hugh R]

Thanks guys, I'll try the dremmel since I own one.

[legion]

Angle grinder?

[slodave]

Originally posted by milt
Not everyone has liquid N on hand. Any grinding disc will go through it like butter. The thinner the disc, the better. Even a Dremmel will work.

What?!? Doesn't everyone keep a gallon in the freezer?

MacGyver would have used a pipe, some magnesium shavings made from his trusty Swiss Army pocket knife (from a ten speed racing bike that just happens to be lying around) and a flint striker to ignite the mag.

[red-beard]

Liquid nitrogen is cheaper than milk. And it doesn't make the Cherrios soggy.

[slodave]

Originally posted by red-beard
Liquid nitrogen is cheaper than milk. And it doesn't make the Cherrios soggy.

Yeah, but it gives you a nasty case of brain-freeze

[Tobra]

they sell liquid nitrogen over the counter for warts, surprisingly enough. They can also be defeated with a scissor jack

[competentone]

Originally posted by Tobra
they sell liquid nitrogen over the counter for warts, surprisingly enough. They can also be defeated with a scissor jack

Warts can be defeated with a scissor jack????

You really have to explain this to us!

[K. Roman]

ooops

[cashflyer]

My portable acetylene torch defeats almost all locks.

... and warts.

[Noah930]

+1 on Tobra's idea for a car jack. Either a scissors jack or bottle jack, between the U-shaped arms of the bike lock. Never done it myself, but have heard that this works.

[RickM]

A dremel sounds like a lot of work. A 4" angle grinder with a cut-off disc will be much quicker. 1/32" thick is best...as Milt mentions.

For portability one can buy cutoff discs with arbor so it can be chucked into a portable drill.

[the]

I'm with rick, I can't imagine how long that would take, and how many of those tiny Dremel cutoff discs you'd go through, trying to cut a hardened steel Kryptonite style lock with a Dremel.

[legion]

Originally posted by the
I'm with rick, I can't imagine how long that would take, and how many of those tiny Dremel cutoff discs you'd go through, trying to cut a hardened steel Kryptonite style lock with a Dremel.

I tried to manufacture a new trigger for one of my paintball guns from 1/8" mild steel plate with a Dremel. It took me two weeks and two packages (40 in all) cutoff discs.

I got my angle grinder w/ cutoff disc for $15 from Menard's. For as often as I use is (1-2 times a year), it's the right price.

[RickM]

I noticed that alot of the TV fabricators use a an electric angle grinder/cutoff disc combo to cut sheet metal. I find that the electric AG has quite a bit of gyroscopic pull and is sometimes difficult to handle. For sheet metal I much prefer a pneumatic cuttoff.

[rammstein]

Liquid Nitrogen is clearly the FUN way to do it. Take a video for us.