Tap Drill Chart (mm and inches)
| TAP SIZE | TAP SIZE | CUTTING TAPS | CUTTING TAPS | TRU-FLO ™ FORMING TAPS |
| INCH | METRIC | DRILL SIZE | DECIMAL EQUIVALENT | DRILL SIZE |
| 0-80 | 3/64 | .0469 | 54 | |
| M1.6 X 0.35 | 1.25mm | .0492 | 1.45mm | |
| M1.8 X 0.35 | 1.45mm | .0571 | 1.65mm |
Full Answer
How do you calculate tap drill size?
Tap Drill Calculator
- Only enter numbers in the fields.
- Do not enter any units of measurement.
- You can enter fractions. (i.e. 1/4)
- If you don't know the %, just enter 70 Example: 1/2 - 20 Thread
- 1/2 = Major diameter
- 20 = Threads / Inch (TPI)
How to calculate tap drill size in seconds?
- The DMB is the diameter measurement you figured out above, .3125.
- The full thread percentage depends on what size thread you want, typically between 70 and 85, but we’ll use 75 for this example.
- The other variable, Ni, is the other part of the tap. Let’s use the 5/16″-18 tap, for instance. The Ni for that tap is 18.
What size tap should I use?
Metric Tap Drill Chart
- M2
- M3
- M4
- M5
- M6
- M7
- M8
- M9
- M10
- M11
How to calculate tap drill sizes for oversized taps?
Thread Forming Advantages:
- Chipless tapping eliminates problems in blind holes.
- Greater thread strength when grains follow the contours of the thread in steel and stainless steel.
- Better thread gaging and reduced oversized thread productivity.
- Constructed without flutes for a stronger, more solid tap
- Lasts 3 to 20 times longer than fluted taps with cutting edge.
What is drill size for tapping?
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 is the tap drill formula?
Tap-drill diameter equals nominal diameter minus thread pitch. I quickly calculate proper tap-drill diameters using this simple formula. Tap-drill diameter equals nominal diameter minus thread pitch. For example, drill size for a 3/8-16 thread is 0.375 0.0625 (pitch) = 0.312 in.
What is the tap drill size for M10?
Tap sizeBasic major dia (mm)Drill size (mm)M8 x 18mm7mmM10 x 1.510mm8,5mmM10 x 1.2510mm8,8mmM12 x 1.7512mm10,2mm24 more rows
What drill bit do I use for a 3/8 tap?
Nominal Size (inches)T P ITapping Drill Size1/41911.8 mm29/64"3/81915.25 mm19/32"24 more rows
How do I choose a drill bit for a tap?
A good tap drill is 90% (± 2 pp) of major diameter for fine threads. For metric V threads, the concept of major minus pitch (i.e., the major or widest diameter of the intended screw in millimeters minus the pitch of the threads of that screw in millimeters per thread) yields a good tap drill diameter.
How do you determine tap size?
How to Calculate Tap Drill SizeMeasure the overall diameter of the tap with the micrometer. ... 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.More items...
What size drill bit is 10mm?
Metric Tap and Drill Bit Size TableTapMetric DrillUS Drill10mm x 1.258.9mm11/32"10mm x 1.09.1mm-12mm x 1.7510.5mm-12mm x 1.510.7mm27/64"13 more rows
What is the drill size for M30 tap?
(M30 x 3.5) - 26.5mm Tapping Drill.
What size is a M5 tap?
As I understand it the correct drill size for a M5 tapped thread is 4.2mm (hole size - pitch: 5.0mm - 0.8mm).
What size tap do I need for a 3/8 bolt?
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.
What size drill bit do I need for 3/8 NPT tap?
37/64"NPT Tap Drill ChartTap SizeDrill SizeTap and Drill Set3/8" NPT Tap37/64" Drill Bit3/8" NPT Tap and Drill Set1/2" NPT Tap23/32" Drill Bit1/2" NPT Tap and Drill Set3/4" NPT Tap59/64" Drill Bit3/4" NPT Tap and Drill Set1" NPT Tap1-5/32" Drill Bit1" NPT Tap and Drill Set10 more rows
What is a 3/8 drill?
This answer is not useful. Show activity on this post. 3/8 inch is the maximum shaft diameter that fits in the chuck. That doesn't mean you can't drill larger holes, but the part the drill chuck grips has to be this size or smaller. (Some higher-powered drills have half -inch chucks.)
What are the sizes of drill bits?
Metric drill bit sizes: diameter of the bit in terms of standard metric lengths.#N#Letter drill bit sizes: the sizes are indicated in letters, from size A (the smallest) to size Z (the largest).#N#Number drill bit sizes: the sizes are indicated in numbers, range from size 80 (the smallest) to size 1 (the largest). Number and letter sizes are commonly used for twist drill bits rather than other drill forms.#N#Fractional drill bit sizes: the sizes are written as irreducible fractions. ANSI B94.11M-1979 sets size standards for jobber-length straight-shank twist drill bits from 1/64 inch through 1 inch in 1/64 inch increments.#N#Decimal drill bit sizes: written in number with 4 decimal places, equivalent to fractional-inch drill bit sizes
What is the difference between tapping and drilling?
Drilling is a process of producing a hole while tapping is a technique used to cut a thread inside a hole, so the drill bit and tapping tool are often used in sequential to fabricate CNC parts with thread holes.
What is the purpose of a tap?
A tap is a screw-like tool with threads that look like both. There may be two, three, or four flutes between the to cut screw threads in a hole or a nut. The interruption between the threads and flutes creates the cutting edge. The threads just behind the cutting edge may be relieved or backed off to produce sharpness.
What are the 3 types of taps?
The three tap types are taper, plug, and bottoming tap. Let’s discuss a little about all of them.
What are tap size and drill size?
People use taps to cut threads for bolts or screws into materials such as plastic, metal, or even wood.
Tap Drill Size Formula
There are threads of two sizes; metric and imperial. Both are calculated the same way by subtracting the pitch from the diameter of the thread. For example,
How To Read A Tap Drill Chart
Now that we know how to calculate the drill size for tap drill, it is better to have an understanding of how to read the tap drill chart as well. This will help us work faster without needing to calculate ourselves.
Can you use a drill to tap threads?
We’ve discussed previously that tapping means a process by which you add threads to a hole to accommodate a screw there. However, it can be a major hassle if you have to make a lot of tapping holes at a go. Fortunately, instead of using hand tools, you can use cordless power drills to tap much quicker.
Some Tips Regarding Tap Drilling
The drill must be pointing straight down so that the hole becomes straight for your tap.
How to minimize tapping problems?
To minimize tapping problems and lengthen tool life, use the largest drill possible to produce a minor diameter that will result in the lowest percentage of full thread consistent with adequate strength. A minor diameter that provides a 55% to 65% thread is sufficient for most requirements, but in some cases a higher percentage of thread may be necessary to conform with the minor diameter limits of the thread class specified.#N#Drills generally cut holes larger than their diameters. In the form bellow, the probable percentages of full thread were determined by the average amount oversize the various drills are expected to cut. Reaming becomes necessary when close control of the hole size is required.
Do drills cut larger holes?
Drills generally cut holes larger than their diameters. In the form bellow, the probable percentages of full thread were determined by the average amount oversize the various drills are expected to cut. Reaming becomes necessary when close control of the hole size is required.