# What is the clearance hole drill size for #4-40 fasteners?

## What is the clearance hole drill size for #4-40 fasteners?

Tap and Clearance Drill Sizes

Screw O.D.
2-56 0.0860 0.0960
3-48 0.099 0.1065
4-40 0.1120 0.1285
5-40 0.125 0.1405

### What size is a #40 hole?

Drill Bit Size Chart

Size Decimal Equivalent Decimal Equivalent
.40 mm 0.0157 0.3465
78 0.016 0.348
.42 mm 0.0165 0.3504
.44 mm 0.0173 0.3543

#### How do you calculate tap hole 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 size is a number 10 hole?

They have slightly different requirements for some screw sizes.

Screw Size Screw Threads per Inch Recommended Hole Diameter
#10 12 0.1590″
#12 11 0.1875″
#14 / 1/4″ 10 0.2188″
5/16″ 9 0.2900″

What is a size 40 drill bit?

Number Size Drills

No. Dia.
37 .1040
38 .1015
39 .0995
40 .0980

## What size is a 4 40 tap?

Tap and Drill Size Chart

1-64 .0595 No. 53
2-56 .0700 No. 50
3-48 .0785 No. 47
4-40 .0890 No. 43

### What size tap do I need for 1/4 inch hole?

One of the most common sizes is a quarter-inch with 20 threads per inch, so you will want to know what size drill bit for 1/4″ 20 tap….What Size Drill Bit for 1/4″ 20 Tap?

Screw Size Drill Bit Drill Bit Size
1/4″ 20 Tap #7 13/64″
1/4″ 28 Tap #3 7/32″

#### How are drill sizes measured?

Check the Shank Typical drill bits have markings somewhere on the shank above the threads. It’s small, but it usually has the drill-bit diameter stamped into the metal; the number is written in fractions. For example, the markings may read: 1/4-inch, 3/6-inch or 25/32.

How do you calculate tap drill size?

How to Calculate Tap Drill Size. Apply the numbers to the formula using an 84 percent thread depth. The formula would be: Dh = 0.252 — 0.0130 (84/20) = 0.0130 (4.2) = 0.252 — 0.0546 = 0.1974 inches. Find the nearest drill bit size in 1/16ths of an inch. Multiply 0.1974 times 16 and the answer is 3.15.

What is the formula for tap drill size?

Measure the overall diameter of the tap with the micrometer. In this particular instance,we want a drill bit for a ¼ – 20 tap.

• Use the following formula for finding the correct drill bit size: Dh = Dbm — 0.0130 (percentage of the full thread desired/Ni).
• Apply the numbers to the formula using an 84 percent thread depth.
• ## What size hole to drill for 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.

### What size drill for tap?

Examples A good tap drill is 85% (± 2 pp) of major diameter for coarse threads, and For metric V threads, major minus pitch yields a good tap drill diameter. For both of these rules of thumb (85%/90% and major minus pitch), the tap drill size yielded is not necessarily the only possible one, but it is a good one for general use.

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