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## What size drill bit do I need for a 1 inch NPT tap?

1-5/32″
NPT Tap Drill Chart

Tap Size Drill Size Tap and Drill Set
1″ NPT Tap 1-5/32″ Drill Bit 1″ NPT Tap and Drill Set
1-1/4″ NPT Tap 1-1/2″ Drill Bit Only Sold Individually
1-1/2″ NPT Tap 1-47/64″ Drill Bit Only Sold Individually
2″ NPT Tap 2-7/32″ Drill Bit Only Sold Individually

## What is a 1 inch NPT?

Specifications. NPT is defined by ANSI/ASME standard B1. 20.1. The taper rate for all NPT threads is 1 inch of diameter in 16 inches of length ( 3⁄4 inch per foot or 62.5 millimeters per meter) measured by the change of diameter (of the pipe thread) over distance of thread.

What is the tap drill size for 1/2 NPT?

NPT Size Tap Drill Size (in.) (Decimal) (in.)
1/4 – 18 7/16 (0.438)
3/8 – 18 9/16 (0.562)
1/2 – 14 45/64 (0.703)
3/4 – 14 29/32 (0.906)

### What size is AQ drill bit?

Drill Bit Size Chart

Size Decimal Equivalent Size
83 0.012 8.30 mm
82 0.0125 21/64″
.32 mm 0.0126 8.40 mm
81 0.013 Q

### What size is a #28 drill bit?

To Tap This Size Screw Or Bolt: Use This Drill Bit: Decimal Inches
8-36 NF #29 .1360
8-40 NS #28 .1405
3/16-24 NS #26 .1470
10-24 NC #25 .1495

What is the inside diameter of 1/4 NPT?

0.533”
As a general “rule of thumb” an NPT thread is approximately 1/4″ (0.25”) larger than its “name.” For a 1/4″ NPT fitting the “nominal” OD is 0.533”. NPT fittings are slightly tapered so the “nominal” diameter is the diameter in the middle of the threaded portion, as measured by the top (crest) of the threads.

#### What size hole do you drill for 1/8 NPT?

5/16″ for 1/8″ NPT.

#### What size is a #1 drill bit?

Drill size Diameter (in) Diameter (mm)
1 mm 0.0394 1.0000
#60 0.0400 1.0160
#59 0.0410 1.0414
#58 0.0420 1.0668

What size is a #45 drill bit?

Drill sizes to 1″ diameter

Drill sizes to 1″ diameter Legend Fractional Inch Letter Drill Millimeters Number Drill
Millimeters Inches Designation
2.0828mm .082″ #45
2.1844mm .086″ #44
2.2606mm .089″ #43

## What are the standard drill sizes?

Range 1 (R1) is shortest in length, more common for sizing production tubing or casing, and ranges from 18 to 22 ft. Range 2 (R2) is considered the standard length for drill pipe and ranges from 27 to 31 ft. Range 3 (R3) is common in casing and also deployed in deep water drilling applications.

## What size drill do you use for tap?

Drill Bits and reamers. The two most common methods of creating starter holes for taps are drilling with just a drill bit or drilling with both a bit and reamer.

• 1/4-18 NPT Starter Hole Drill Bit.
• Drilling and Tapping Tools.
• Drilling and Tapping Tips.
• How is NPT measured?

NPT is defined by ANSI/ASME standard B1.20.1. The taper rate for all NPT threads is 1 inch of diameter in 16 inches of length (3⁄4 inch per foot or 62.5 millimeters per meter) measured by the change of diameter (of the pipe thread) over distance of thread.

### What size drill bit for a pipe tap?

Most drill charts recommend a 5/16 drill for a 3/8-16 bolt. Cutting holes that are smaller will leave more material for the tap to cut out, risking tap breakage. Drilling larger holes will result in weaker threads, increasing the possibility of stripping them.