What do drill bit numbers mean?

Numbered bits are related to wire size, so the larger the number, the smaller the size. The numbering sequence starts with the smallest drill size #80 which is at a decimal size of . 0135.

What size is a 1/4 drill bit?

Drill Bit Hole Diameters
Metric Size	Fractional Size
5 mm	.1968	7/32
6 mm	.2362	15/64
7 mm	.2756	1/4

What size is a 1/8 drill bit in MM?

Fractional inch drill bit sizes

Drill size	Diameter (in)	Diameter (mm)
3/32 in	0.0938	2.3813
7/64 in	0.1094	2.7781
1/8 in	0.1250	3.1750
9/64 in	0.1406	3.5719

What size is a number 20 drill bit?

Drill Bit Size Chart

Size	Decimal Equivalent	Size
74	0.0225	21
.60 mm	0.0236	20
73	0.024	4.10 mm
72	0.025	4.20 mm

What size is a 6 mm drill bit in standard?

6mm is 0.2362198 inches. 15/64 is 0.234 inches.

What is the size of a standard bit?

Fractional-inch drill bit sizes For Morse taper-shank drill bits, the standard continues in 1/64 inch increments up to 1¾ inch, then 1/32 inch increments up to 2¼ inch, 1/16 inch increments up to 3 inches, 1/8 inch increments up to 3¼ inches, and a single 1/4 inch increment to 3½ inches.

How do I know what screwdriver bit to use?

Choose the bit size that fills the screw head entirely. A bit that is too big or too small will not seat properly, and you’ll end up with a stripped screw.

What size is 21 drill bit?

To Tap This Size Screw Or Bolt:	Use This Drill Bit:	(Closest Fractional:)
10-24 NC	#25	5/32″
3/16-32 NS	#22	–
10-32 NF	#21	5/32″
5mm-0.90mm	4.2mm	–

What size drill bit is a number 7?

0.2010 inches
A number 7 drill bit is 0.2010 inches. As a fraction, the 0.2010 decimal is 201/1000.