What It Is

HSS hand taps are precision cutting tools used to create internal threads inside pre-drilled holes. They are commonly used to cut new threads or restore damaged threads in bolts, components, and mechanical assemblies.

Material & Construction

Manufactured from high-speed steel (HSS), these taps provide a balance of hardness and toughness for reliable performance in general-purpose threading applications. HSS offers improved wear resistance compared to carbon steel, making it suitable for repeated use in a variety of materials.

Tap Styles Explained

Hand taps are available in three primary styles:

• Taper Tap – Features a longer chamfer to help start threads straight and square to the workpiece.
• Plug Tap – The most commonly used style, offering versatility for both through and blind hole threading.
• Bottoming Tap – Designed to generate threads close to the bottom of blind holes after threads have been started.
• A tap set typically includes one taper, one plug, and one bottoming tap for complete threading capability.

Applications

Common applications include:

• Creating internal threads in metal components
• Repairing damaged or jammed internal threads
• Maintenance and repair operations
• General machine shop and fabrication work

Frequently Asked Questions

What is an HSS tap used for?

An HSS tap is used to cut internal threads inside a drilled hole so that bolts or screws can be properly installed.

What is the difference between taper, plug, and bottoming taps?

Taper taps have a longer chamfer to help start threads. Plug taps are the most versatile and commonly used. Bottoming taps are used to cut threads closer to the bottom of blind holes.

Can HSS hand taps be used in machines?

Yes. While commonly used by hand with a tap wrench, HSS hand taps can also be used in appropriate machine tapping applications.

What materials can HSS taps cut?

HSS taps are suitable for steel, aluminum, brass, and many other machinable materials.

When should I use a tap set?

A tap set is recommended when threading blind holes, as it allows you to start threads with a taper tap and finish them with a bottoming tap.