Questions tagged [bits]

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Robertson/Square drive uses/sizes?

I'm in the market for some bits for Robertson/Square drive fasteners. I noticed one set has sizes SQ2.5 and SQ2.7, in addition to the more normal whole number sizes. What are these two odd ball sizes ...
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  • 105
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1 answer
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Adapter for 1/4" electric screwdriver to hold 3/8" bit

I have a screw driver that supports 1/4" bits. I also got a hole saw , but it's apparently 3/8" hex. Is there anything that can adapt one to another? I need to cut a few holes in very soft ...
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2 answers
104 views

Is it safe to use short bits from manual screwdriwer with electric drill?

Is it safe to use short bits (from manual screwdriver) with electric drill Ryobi R18PD3? Length of the hexagonal part (that fits into the drill) is 1.5cm. Original bits seems to be a bit:) longer. ...
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23 votes
6 answers
4k views

What is the right tool for old, rusty, flat cross head bolts?

I'm trying to restore an old park bench, and I am struggling to unscrew the bolts. The heads have this wide (~12-14 mm) "flat cross" pattern that I have never seen before (see photo), and I ...
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1 vote
3 answers
238 views

Drill Bit Accessory Identification

I have a set of DeWalt drill bits, and there was one piece included that I don't know the use for. Pictures (quarter for scale): The set includes a magnetic sleeve as well, but don't think it is ...
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3 votes
1 answer
594 views

Is it normal for drill bits to slip in a keyless chuck when binding in metal?

I'm trying to drill some 5-10mm holes in 1-1.5mm thick steel. I'm using a DeWalt DCD777 18V cordless drill with Bosch HSS bits (which claim they're made for drilling into metal). Both the drill and ...
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7 votes
3 answers
811 views

Why does a driver bit shank have an indentation?

The part that interests me is marked in the picture. I have no tool that utilizes that part of a bit and I cannot find any clues on the net... In fact, all of my bit holders have better grip on bits ...
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4 answers
634 views

What drill bit for what screw tap?

If I want to drill a hole for use with an M3 (or other metric size) do I need a special lookup table or do I simply use an M3 bit with an M3 tap?
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  • 385
4 votes
3 answers
1k views

Are impact driver bits a different standard than screwdriver bits?

I bought a Milwaukee M4 cordless screwdriver (Milwaukee 2101-22) from Home Depot. Home Depot has plenty of Milwaukee screwdriver bits and I bought a set. The bits are too short. The head of the bit ...
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  • 245
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1 answer
56 views

Magnetic impact driver bits

I am looking to buy some magnetic impact driver bits (philips head, torx head, etc), but I have not found any online. Am I searching for the wrong thing or is this not something that is made? Not ...
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0 votes
3 answers
221 views

what kind of drill bits are these? Trying to drill through flat side of a fence T-Post

I'm trying to drill through 1/4" hard steel. the thicker bit went through relatively easily one time, but on the second go just spins. the thinner bit did not go far .. i think both need to be ...
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  • 239
2 votes
0 answers
200 views

4mm hex shank to 1/4" hex shank adapter [closed]

I have a screwdriver which uses interchangeable bits and a magnet to hold them in place. The screwdriver takes 4mm hex shank sized bits. It seems this shank size is really rare, because I can't find ...
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3 votes
2 answers
1k views

Is there a universal colour code for screw bits?

Lately I've been seeing colour coded screw bits, like in the set below (from Lidl's store brand, Powerfix). (Click for larger version) Red for Phillips Blue for Pozidriv Orange for slotted Yellow ...
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  • 475
14 votes
5 answers
12k views

Masonry bits dulling after 3-4 holes

I'm using an 18v makita hammer drill with a 3/16" Bosch blue granite turbo concrete bit to drill 2" deep holes into concrete-filled cinder blocks. With a fresh bit, it takes about 15 seconds to drill ...
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1 vote
2 answers
92 views

Trying to decide between these two types of masonry bits

I'm undecided if I need an SDS Max vs Plus for masonry drill bits. I've heard that drilling with SDS Plus can take a while with larger diameter bits. Anyone ever drill larger than 1" with an SDS Plus ...
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11 votes
8 answers
20k views

How to drill holes in 3/8" thick steel plates?

I had to drill some 1/2" holes in 3/8" steel plates. In addition to taking something like 15 min per hole, a brand new drill bit lasts maybe two holes and it is trash. What is the best way to drill ...
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2 votes
2 answers
1k views

Want to know how hex bit shank works and the history behind it's design

I have tried to search this in google but I haven't found a complete explanation, so I ask this here. I also have read other answers related with hex bit socket, but it still not satisfied. How the ...
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0 votes
2 answers
1k views

What are the grooves on the shank of my 16" masonry drill bits for?

I had to purchase a new 16" masonry drill bit for a project I am working on and it has the below grooves on the shank. I am curious why, but also want to know if there is a special drill that it is ...
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0 votes
1 answer
315 views

How to choose hole sizes when building a sorting sieve?

I'm planning to build a sorting sieve out of a set of plastic containers with holes drilled in the bottom. The container with the largest holes will be on top and the one with the smallest holes ...
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0 votes
3 answers
8k views

How are mini drill bits mounted on a regular sized drill?

I have no prior knowledge of drilling but I've stripped a screw on one of my electronics so I need to drill it out to access the insides for a fix. From basic research, I understand that the 'drill ...
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3 votes
2 answers
8k views

what drill bit size to pilot drill hole into stud for 15/64" lag bolt

Im trying to install a tv mount that has no instructions. Using my drill guage plate, 15/64" is the smallest hole these lag bolts can screw into. What size drill bit should I now use for pilot ...
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1 vote
1 answer
156 views

Will a Bosch hammerdrill bit drill concrete faster than a cheap Makita bit?

I had to drill several 3/8" holes into very hard concrete. I purchased a Bosch LBH008 drill bit, but since I hadn't received it, I bought a cheaper $3.60 Makita drill bit that drills incredibly slow. ...
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  • 1,817
2 votes
5 answers
10k views

How best to drill pilot holes through hardened steel exterior door frame?

I'm trying to drill pilot holes through my exterior door frame in order to install a weather seal. I purchased a few new cobalt drill bits labeled for hardened steel. However, each new bit was ...
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2 answers
138 views

Can I use Wiha "Micro Bit" bits with regular 1/8'' hex screwdriver?

Wiha says their micro bits are 4mm in diameter, and suggests to use special adapter for 1/4 screwdriver. Obviously these 4mm micro bits are smaller than 1/4 inch, but are they compatible with 1/8 hex ...
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  • 101
3 votes
3 answers
2k views

3-prong tamper proof screw type?

Anyone know what bit would fit this? I have only seen the 2-prong spanner bits...
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3 votes
8 answers
7k views

How to drill a 0.75" hole in metal

I'm trying to drill a 0.75" hole in a metal pole. I got a 0.75" drill bit from Home Depot (DEWALT 3/4 in. Black Oxide Reduced Shank Drill Bit) that I was told is appropriate for metal. I used a punch ...
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6 votes
2 answers
2k views

Drilling 1/4" steel plate and concrete?

I need to drill (44) holes in (22) 1/4"-thick stainless steel plates. These are for 3"x3/8" heavy Duty Screw Anchors that will go through the plate and into the concrete. My question is: if possible, ...
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  • 1,817
1 vote
1 answer
458 views

How do I adapt my spiral ratcheting screwdriver to use with all bits?

I have a spiral ratcheting screwdriver like the one shown below. I want to adapt it to use with all kinds of bits. This basically means putting a 1/4" hex socket on the other end. Fig.1. Yankee ...
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  • 325
0 votes
1 answer
2k views

looking for hexlike-bit to unscrew bottom of ikea couch leg

We're trying to unscrew a leg from an Ikea couch (it's possibly the Stockholm model, not sure). The bolt on the inside looks hexlike, but all the hex bits we've tried doesn't seem to work. Can anyone ...
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  • 13
1 vote
3 answers
5k views

Can a hammer concrete drill bit be used with a regular drill for a small project

I have to run a 1/2 inch pvc electrical conduit through a mortar joint The mfg calls for a 7/8 masonry bit to be used to allow the conduit through. Have not been able to find such a bit at the big ...
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  • 441
0 votes
2 answers
733 views

Router bit suitable for straight cuts in pine 1/2" deep; Dutchman door patch

I'm replacing Mortise locks with contemporary levers on solid wood doors in my apartment. The doors are pine, 1 3/4" thick. I've removed the Mortise locks, leaving behind two large holes and the ...
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0 votes
1 answer
5k views

What set of bits is compatible with a Bosch Uneo (SDS-Quick)?

I've tried searching for at least an hour, but I'm finding very few resources and the compatibility situation is very confusing and frustrating. Most things seem to be compatible with SDS-Max/Plus, ...
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0 votes
1 answer
492 views

Bit holder or hex chuck?

A novice DIY-er, I'm building out my arsenal of tools. One of the things that has been possible me is the bit holder vs the hex chuck. When buying bits, so far I've gone for the Irwin impact-ready ...
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0 votes
1 answer
144 views

Are old spade bits worth sharpening?

I recently found an incomplete set of dull, rusty spade bits that belonged to my father. They are likely 40-45 years old. Are they worth trying to clean up and sharpen or should I just throw them ...
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1 vote
3 answers
13k views

How to drill a hole in plexiglass (acrylic sheet)?

What kind of bit should I use to drill a 1/2" hole into acrylic glass (plexiglass)? The local hardware store does not have a 1/2" hole saw - which was my first inclination. I am now considering these ...
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1 vote
1 answer
122 views

Building a well-rounded set of bits

First and foremost, please my ignorance as I'm new to the whole DIY thing. I bought a cheap set of drill bits, munched through them like butter, and so have now decided to make the investment into a ...
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0 votes
1 answer
2k views

Is there an approximate substitute for a Torx T40 bit?

I needed a Torx T40 bit for a job, but that bit was missing from my toolbox. I didn't want to strip the bolts (they were fastened tightly over a decade ago), so I had to wait until I could get the ...
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