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. in diameter, and for a 10-32 thread, the drill diameter is 0.190 0.032 = 0.159 in.
What is tap size and drill size?
Rules of Thumb 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.
What size is a #6 drill bit?
Screw Size Pilot hole size for hardwoods* Pilot hole size for softwood**
---------- ------------------------------ ------------------------------
#4 1/16" 3/64"
#5 5/64" 1/16"
#6 3/32" 5/64"
#7 3/32" 5/64"
How do I know what size my tap is?
- Locate the aerator at the outlet/mouth of your tap.
- Remove the aerator by rotating counter-clockwise.
- Measure the diameter of the tap using a ruler/scale.
- Check if the aerator has male (threads on outside) or female (threads on inside) threads.
- Choose the right aerator adapter for your tap.
So what are the types of taps? There are 3 main taps you should be familiar with and they are: Taper, Plug, and Bottoming tap. The taper tap can be identified by the visible and pronounced tapering of the cutting edges.
What are the four types of taps?
Tapping tools are divided into four types: straight flute tap, spiral point tap, spiral fuse tap, and forming tap. Which type you use depends on what type of hole you want to thread, blind hole or through hole, and the component material.
What size drill bit do I use for a 6-32 tap?
Tap Fractional Drill Bit Number Drill Bit
------ -------------------- ----------------
#6-32 7/64" 35
#8-32 - 29
#10-24 5/32" 25
#10-32 5/32" 21
What is a 6-32 tap?
The 6-32 thread starting tap can be used for cutting new threads or to clean up damaged threads in a previously tapped hole. This tap has several tapered threads at the end to guide the tap into the hole and begin cutting threads.
Taps typically have several flutes constructed in its design. They are the grooves or valleys cut into the body of the tap. Higher numbers of flutes increase the strength of the tap and reduce space or chip flow. Thread size is the number of Threads Per Inch (TPI) which is measured along the length of the tap.
How do you measure the diameter of a tap?
The easiest way to find out the size of the thread in your mixer tap or faucet is to remove the aerator (this is the part that screws off at the end of your tap) and measure the diameter (across the centre) of the thread.
What is tap hole diameter?
Rules of thumb A good tap drill is 85% (± 2 pp) of major diameter for coarse threads, and 90% (± 2 pp) of major diameter for fine threads. For example, a screw with a pitch of 1/20 in (20 threads per inch) has a pitch of 0.050 in and a 1⁄13 in pitch (13 threads per inch) has a pitch of 0.077 in.