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What size drill bit for concrete bolt - Hillman Rawl Spike Concrete

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You will need a carbide tipped masonry bit that is the same size as the spike- 1/4", 3/8" etc. Of course you will have to use a hammer drill.

Posted on Jan 03, 2015

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Posted on Jan 02, 2017

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What drill bit to I use to make a hole in the wall of an old fibro house


Feb 18, 2015 | Drills


How to remove a broken bolt the easy way...

Say you have snapped the head off a rusty bolt on the car, its infuriating!

But, there is a fantastic tip from a mechanical engineer that works every time, and is easy to do!

Lets assume the bolt is a 10mm exhaust stud or similar, take a 4mm drill bit (sharp one) and a 4mm hex (allen) key, (especially a t-bar type or socket mounted one) - drill a pilot hole right down into the bolt with the 4mm drill, as far as you can without snapping the drill bit in the bolt!!! Use light pressure, a sharp drill bit and let the drill do the work, and keep it straight....then when you pull the drill out, tap the hex key into the hole you made with a hammer, get it in as far as you can, it will be a tight fit as the 4mm hex key measures 4mm from flat to flat across it, and the corners of each flat are slightly more than that so it bites very well into the bolt, spray plenty of release fluid or wd40 around the exposed bolt thread to help loosen it, leave for 10 minutes if rusty, then turn the hex key with either a socket and wrench or the t-handle on it, and it will turn the bolt without slipping!

And hex keys are VERY VERY strong, much stronger than a bolt as they are tempered high tensile steel - the bolt will unscrew with ease! Forget useless screw and bolt extractors! And simply pick a drill size that gives a decent hole leaving some metal at the sides of the bolt but not too small a size, and keep the hex key to the same size in mm as the drill you use, if you made a mistake just go up a size or 2 on both drill bit and hex key and you get another try, but should not need it!

on Jan 14, 2010 | Ford F-150 Cars & Trucks

1 Answer

Broken head bolt

1..Asertain the size of the bolt.
2. down to the hardware/tool suppliers & get a drill bit & a reverse tap.
for that size bolt +tube of cutting paste.
3use a sharp nail & very gently tap the centre of the bolt - this will stop the bit from wavering - dip the bit into the cutting paste & gently drill at least deep enough to give reverse bit enough bite.
4.insert the r/bit into a handle that comes with it - insert into the c/paste & very gently tap it - turning to the left till u feel it lock - continue it the bolt turns out.
TOOLS;drill,nail,hammer,bit & reverse bit .cutting paste.

Jan 15, 2014 | kawasaki Motorcycles

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What speed would i need to set my cordless drill at to put hole in wall

Your drill will drill a hole at any speed, the drill bit needs to be sharp to drill the mateirial.The type of wall material is important.Drywall is soft but a masonry bit should be used.A masonry bit has a flat bar accross the point and slower speeds are best.Wood walls / studs you need wood bits that are sharper and medium to high speeds are used.Concrete or Block walls again require Masonry bits.If very hard concrete as in foundation walls or filled block the use of a Hammer drill will work much faster.Good Luck

Jul 29, 2011 | Drills

1 Answer

Injector bolt sheered on no. 4 cyl

There's a couple of tools that make bolt extraction a little easier. The first one I would try is a reverse drill bit. A reverse drill bit looks just like a standard drill bit but it drills in a counterclockwise direction instead of clockwise. If you start drilling into the center of the bolt, it will drill partially into the bolt and at some point, the tip of the bit should grab onto the bolt and twist it out since it's going in the same direction you would twist it to loosen the bolt. Sometimes, if the bolt has been torqued down too tight, a reverse drill bit won't work. If that's the case, keep drilling the hole in the center of the bolt with the reverse drill bit until you've gone about 1/4 to 1/2 an inch deep. Then try using an easy out to extract the bolt. An easy out looks kind of like a tapered drill bit. I've shown a picture of one below. (You can buy a kit that has both easy outs and reverse drill bits) Choose the right size easy out for the size of hole you just drilled. The tip of the easy out should go partially into the hole, just enough to grab onto the bolt as you twist it counterclockwise. With the easy out in the hole, put a wrench or socket on the end of it, push down hard and twist counterclockwise. That should hopefully extract the bolt.
Good Luck!

May 31, 2011 | 2003 Jeep Grand Cherokee

1 Answer

What tool should we buy to extract a frozen bolt in a water pump on a 1986 Ford Mustang GT?

did the head snap off? If so you will need to buy a Easy Out tool corresponding to the size of the bolt.
you can buy a kit to.
the right size easy out for the bolt will tell you what drill bit to use. you than drill a hole in the center of the bolt and then put the easy out in the drill and push hard while spinning the easy out in the hole you drilled with the smaller drill bit. the easy out will bite and unscrew the bolt.

Apr 09, 2010 | 1995 Ford Mustang

3 Answers

When drilling in precast concrete, Does it take a special concrete bit?

It depends on what kind of fastener you are going to use, a split bolt is different that an ancor bolt and the need different size holes. so tell us the type of anchor bolt your using.

Jan 05, 2010 | Hammer Set Of 4 Hilti Concrete Drill Bits...

1 Answer

How do i install a dive stand for a diving board can i use red head concrete bolts to mount it to the deck

im not sure what red head concrete bolts are but typically you drill a hole just smaller than the bolt into the concrete with a concrete drill bit then screw in the bolts. make sure to not over tighten or make the hole too big you could break off the head.

Sep 15, 2009 | Sr Smith 8' Frontier III Diving Board -...

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Bit or chuck type for a Skil 717 hammer drill

I have a Skill 717, too. It has a hex shank. Here are a couple places that I've located that carry (some) parts: (pages 155 & 157)

also try:

Sep 12, 2009 | Skil Drills

1 Answer


no u dont need water when drilling into concrete with a concrete bit.

Nov 17, 2008 | Drills

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