Taps and Dies
Need Help Choosing a Threading Tool?
Taps cut internal threads in drilled holes, while dies cut external threads on rods, bolts, and studs.
Choose a tap and die set when you need multiple sizes, or a single-size kit for a specific threading application.
Taps & Dies Buying Guide
Choosing a Tap
Taps create internal threads in pre-drilled holes. Hand taps are commonly used for general threading, while spiral point taps help push chips forward in suitable through-hole applications. Pipe taps are designed for threaded pipe connections.
Taper, Plug & Bottoming Taps
Taper taps have a longer lead for easier starting. Plug taps are commonly used for general-purpose threading. Bottoming taps have a shorter lead for threading closer to the bottom of blind holes.
Choosing a Die
Dies cut or repair external threads on rods, bolts, and studs. Hex dies are often used for thread maintenance and repair, while round adjustable dies are useful for cutting external threads.
Selecting the Correct Size
Match the thread diameter, pitch, and thread standard to your application. For internal threading, consult our Tap and Drill Chart to select an appropriate drill size before tapping.
Threading Charts & Calculators
Find the correct drill size and threading tools using our free technical resources.
Frequently Asked Questions
What is the difference between a tap and a die?
A tap cuts internal threads inside a hole, while a die cuts external threads on a rod, bolt, or stud.
How do I choose the correct tap drill size?
The correct drill size depends on the thread diameter, pitch, and desired thread engagement. Use our Tap and Drill Chart for common thread sizes.
What is the difference between taper, plug, and bottoming taps?
Taper taps are easier to start, plug taps are commonly used for general threading, and bottoming taps are designed to cut threads closer to the bottom of blind holes.
Can a die repair damaged bolt threads?
Yes, an appropriately sized threading die can often clean up or restore lightly damaged external threads. Severely damaged fasteners may need replacement.
When should I buy a tap and die set?
A set is useful when you regularly work with multiple thread sizes. If you only need one specific size, individual taps, dies, or single-size kits may be more economical.
Taps & Dies Videos
Learn more about taps, dies, and threading tools with these informational videos from Drill America.