Reddit reviews IRWIN Left Hand Drill Bit Set, Cobalt, 5/64-Inch to 19/64-Inch, 5-Piece (30520)
We found 7 Reddit comments about IRWIN Left Hand Drill Bit Set, Cobalt, 5/64-Inch to 19/64-Inch, 5-Piece (30520). Here are the top ones, ranked by their Reddit score.
Drill bits made of M-42 8% cobalt high-speed steel for super abrasive resistance in tough metals135° split point reduces feed pressure for easier penetration without work hardeningEach drill bit has a heavy-duty spiral flute design that produces fast chip ejectionShorter cutting lips reduce torque for drilling in high-tensile-strength materialsIRWIN drill bits are great for use with screw extractorsIncludes: 5/64-Inch, 7/64-Inch, 5/32-Inch and 19/64-Inch135 Degree split pointM-42 Cobalt steel for tough metals5 PC SetWeight 1 lbs
In mechanics, I'd use a drill bit that spins counter to tight. So, in the typical case that's a left-hand bit. These are fairly specialized and aren't the kind of thing you'll find at Home Depot. Amazon can help.
Use cutting fluid to keep the bits cool. Start with a bit that's smaller than the broken screw shaft and drill slow and successively use larger bits until you either drill out the broken screw or the screw rotates out.
Most of the time, the bits loosen the shaft and eventually just spin out the screw without having to drill it all the way out. Thing is, with the head off the screw, there's no tension holding the threads in place. Just need to spin it free.
I use left handed drill bits to extract broken bolts, usually works really well and doesn't require multiple steps
Use left handed drill bits, it’ll pull it out.
A little more expensive than some, but good tools are their own reward.
www.amazon.com/dp/B0002NYBJG/ref=cm_sw_r_cp_api_i_IXsPDbX4H7CPB
Treat yourself to a set of left hand drill bits. The bits usually start drilling and end up catching and un-threading the stripped/stuck screw.
Get a set of left handed drill bits (Amazon link) then take the smallest one from this kit, press it against the screw head, and turn the drill counter clock wise slowly.
You're trying to get the bit to bite into the head, grab a hold and unscrew it. You can apply a bit of presure.
You can probably get them out pretty easy with a left handed drill bit. These Irwin bits are pretty baller. Just use a self centering punch or a small pointy punch and mark the center, then start with the smallest or second smallest one.
The idea is that the bit will catch the bolt and spin it out.
They also make this set that has spiral flute extractors, just in case the left handed bit doesn't catch.
You should use a torque wrench if you're not (I've totes broken bolts when torquing to spec before, so no hate if you are), a small 3/8" wrench that does inch lbs. Those bolts are probably supposed to be between 80 in lbs and 110 in lbs. Torque wrench will a) ensure you're not over-torquing and breaking bolts, and b) it's even all the way around, so you're not pinching the gasket weird in some spot.
I can appreciate the criticism if you started with a solution first then moved onto that.
But for someone who had been doing machine work for years and has never seen left-handed bits "reverse bits" or whatever... Makes me suspect anyway. https://www.amazon.com/Tools-Cobalt-64-Inch-Assortment-30520/dp/B0002NYBJG
All that being said I appreciated his solution in the end.