How do you identify a drill bit?
Choosing Drill Bits by Type
- Wood Drill Bits: These can be identified by a small, pointed tip at the very end. If you look closely, you can see spurs on each side.
- Masonry Drill Bits: These bits have a gently sloping tip.
- Metal Drill Bits: These have a wide-angled point at the end, and they may also be painted black.
What do letters on drill bits mean?
Number and letter gauge drill bit sizes Number drill bit gauge sizes range from size 80 (the smallest) to size 1 (the largest) followed by letter gauge size A (the smallest) to size Z (the largest).
How can you tell a metal drill bit?
You can distinguish an HSS bit by its black color — a conventional steel bit is chrome. If you’re drilling through hardened metal, even an HSS bit can wear out quickly, and you may need one made from tungsten carbide or titanium.
Why are some drill bits numbered?
As mentioned at the beginning of the article, the numbers on a drill represent the amount of torque the tool can apply to an object (such as a screw) or for hole drilling. The numbers usually range from 1 to 20 (or more) with 1 representing the least amount of torque and 20, the greatest.
What size is a letter O drill bit?
Drill Bit Size Chart
| Size | Decimal Equivalent | Size |
|---|---|---|
| 87 | 0.01 | O |
| 86 | 0.0105 | 8.10 mm |
| 85 | 0.011 | 8.20 mm |
| 84 | 0.0115 | P |
What are the different sizes of drill bits?
Some projects call for specific drill bit sizes, but a bit set that includes sizes from 1/16 inch to 1/4 inch will work for many jobs around the home and workshop. You can add larger bits — 5/16-inch, 3/8-inch, 7/16-inch and 1/2-inch bits — if you need them.
What do the Colours of drill bits mean?
Masonry drill bits normally silver have a wide head on. Gold bits are normally pointed and are for drilling wood etc. Black bits are also pointed headed but for drilling metals.
How can you tell the difference between concrete and wood drill bits?
Masonry bits resemble wood bits at a casual glance because they’ll also have a deep spiral groove to help channel debris from the hole as you drill. The main visual difference is that masonry bits don’t have the blunt, gently rounded tip you’ll see on standard general-purpose bits.
What does a a mean on a drill bit?
A is for Auger. The auger drill bit is basically a wood bit. Using the principle of the archimedes screw the drill takes the material from the front of the drill to the rear, it has a small screw type point which burrows into the wood or timber keeping the drill in the wood while the cutting face shaves off the wood.
What is the smallest size drill bit?
Letter gauge drill sizes are used primarily in North American with A starting with the smallest size working 26 size increments to Z. The following drill chart covers the smallest standard drill diameter size of strong>1/64 to 21/32 and gives you the equivalent sizes in both decimal inches and millimeters.
What does the C mean on a drill bit?
This drill bit is a metal drilling bit, but is for harder materials, HSCo High speed cobalt. C is for Conical drill. The conical or cone drill like the step drill is used for making holes bigger. Usually only for sheet material, otherwise you will end up with a tapered hole.
What are the different types of drill bits?
It’s also known as the spade bit. There is also a type of flat bit which is a cross between an auger and a flat bit, called an expansive bit. This has a fitting attached so the size of the drill bit can be changed to the size of the hole you need it to be.