What size hole do I drill for a 1/2 inch tap?

Nominal Size (inches)	T P I	Tapping Drill Size
1/2	14	18.25mm
23/32″
5/8	14
3/4	14	23.75mm

What is the drill size for 1/2-20 UNF?

Tap, Drill, & Clearance Hole Sizes Chart

Thread Size	Tap-Drill Sizes
Size	DIA
1/2-20-UNF	29/64	.4531
9/16-12-UNC	31/64	.4844
9/16-18-UNF	33/64	.5156

What size drill bit do you use for a 1/4-20 tap?

The best overall size drill bit for 1/4″ 20 UNC tap thread is a #7 drill bit, the measurement being 13/64” (0.203″diameter).

What is the correct drill size to use when cutting a 1/4-20 UNC thread?

For example, the recommended drill size for a 1/4-20 UNC thread is a No. 1 (0.228″-dia.)

What size is a 1/2 inch drill bit?

Drill Bit Hole Diameters
Metric Size	Fractional Size
21 mm	.8268	15/32
22 mm	.8661	31/64
23 mm	.9055	1/2

What is 20 UNF thread size?

UNF Thread ANSI/ASME B1. 1

Nominal Diameter	Major Diameter Inch	Major Diameter mm
5/16″ – 24 UNF	0.313	7.938
3/8″ – 24 UNF	0.375	9.525
7/16″ – 20 UNF	0.438	11.112
1/2″ – 20 UNF	0.500	12.700

What size is #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 drill bit do I need for a 1/2 bolt?

Use the same size drill bit as the diameter of the bolt. If you are using a 1/2″ diameter bolt use a 1/2″ drill bit.

How deep do you drill for a tap?

To determine the ideal minimum drill depth, start with the basic rule: the tap drill depth should be at least one thread or one pitch beyond the chamfer of the tap. In other words, for a 1/4-20 tapped hole requiring a 3/8″ (.

What size is a number 20 drill bit?

What is the pitch of a 1/2 20 thread?

Standard Thread Pitch Chart

Coarse Thread Series – UNC	Fine Thread Series – UNF
Nominal Size and Threads Per In.	Basic Pitch Dia.	Nominal Size and Threads Per In.
7⁄16 – 14	0.3911	7⁄16 – 20
1⁄2 – 13	0.45	1⁄2 – 20
9⁄16 – 12	0.5084	9⁄16 – 18

What size bolt goes in a 1/2 inch hole?

For example, a 1/2″ bolt can fit in a 1/2″ hole. That means the hole does not have to be bigger than the bolt. However, if you’re fastening it with a washer and nut, you do have the option to make a slightly bigger hole for certain awkward installations. The reading of the difference is around 1mm.