WTI Fasteners Databooks
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Wire Insert Taps

A variety of hand and machine wire insert taps

WTI's wire insert taps: machine taps, hand taps. Spiral flute taps, spiral point taps, roughing taps, taper taps, first lead taps, second lead taps, intermediate taps, finishing taps, bottoming taps, plug taps. Helicoil taps

Find the tap that's right for you

WTI taps are manufactured from High Speed Steel (HSS) to provide close tolerance tapped holes in a variety of ferrous and non-ferrous materials. Our hand taps and machine taps are available in an extensive range of sizes across many thread forms. We stock:

We have a variety of wire insert HSS tap types available:

Wire Insert Hand Taps

WTI hand taps have parallel flutes, and are used mainly for hand tapping, but due to much improved manufacturing techniques, may also be suitable for machine tapping. These hand taps are available in three types:

Wire Insert Machine Taps

WTI machine taps are designed primarily for machine tapping, and are available in two forms:

Wire Insert Cold Forming Taps

WTI cold forming taps have no cutting edges or flutes. They are designed to cold form wire insert internal threads in aluminium, brass, magnesium, zinc and other ductile metals.

Pilot Nose Wire Insert Taps

WTI pilot nose 2-stage reamer taps have been developed for the repair of damaged sparking plug threads without the need for additional drilling.


Useful information:

Wire Insert Tap Materials & Finishes

WTI taps are designed to generate wire thread insert tapped holes in a variety of ferrous and non-ferrous materials. They produce close tolerance tapped holes in accordance with all internationally recognised wire insert standards and are compatible with all other wire insert manufacturers products.

Wire Insert Tapping Data

The success of any tapping operation depends on many factors such as:

Our recommended sizes for diameter are charted in our technical data brochure.


If you're unsure which tap you need, get in touch with our sales team today and we'll make sure you get the right tap for the job