What is the drill size for 1/8 tap?

2210″, a bit high.) Metric tap drill sizes are the diameter minus the pitch (For example, 42mm x 1.5 tap uses a 40.5 drill)….

TAPER PIPE SIZES – NPT
TAP SIZE DRILL SIZE
1/8-27 R
1/4-18 7/16
3/8-18 37/64

How do you calculate NPT Drill size?

As a rule of thumb, for Metric threads, the tapping drill can be calculated by subtracting the pitch from the diameter of the thread. eg for an M5x0. 75 thread the tapping drill is 5-0.75mm = 4.25mm. For Imperial (inch) threads the tapping drill size is calculated in the same way, diameter minus pitch.

What drill is used to tap a 1 8 27 NPT hole?

21/64

Tap size Threads per inch Drill size w/ taper pipe reamer
1/16 27 15/64
1/8 27 21/64
1/4 18 27/64
3/8 18 9/16

What size hole do I drill for a 1/4 NPT tap?

7/16″
NPT Tap Drill Chart

Tap Size Drill Size Tap and Drill Set
1/4″ NPT Tap 7/16″ Drill Bit 1/4″ NPT Tap and Drill Set
3/8″ NPT Tap 37/64″ Drill Bit 3/8″ NPT Tap and Drill Set
1/2″ NPT Tap 23/32″ Drill Bit 1/2″ NPT Tap and Drill Set
3/4″ NPT Tap 59/64″ Drill Bit 3/4″ NPT Tap and Drill Set

What is a 1/8 NPT thread?

NPT and NPTF pipe threads – dimensions according ANSI/ASME B1. 20.1/3.

NPT – American Standard Pipe Thread Taper 1)
Pipe Size (inches) TPI Nominal Outside Diameter Pipe OD (inches)
1/16″ 27 0.313
1/8″ 27 0.405
1/4″ 18 0.540