Whitworth Coarse Thread Hand Taps – Set of 3

This Whitworth Coarse Thread Hand Taps set includes three high-speed steel taps — taper, intermediate, and plug — designed for precise internal thread cutting in marine grade metals. Whether repairing engine components, pipe fittings, or deck hardware, these taps deliver clean, accurate BSW threads to keep your vessel operating safely.

Manufactured for long-lasting performance in harsh salty environments, the taps feature sharp cutting edges and efficient chip clearance. The taper tap allows easier starting, the intermediate tap continues the thread formation, and the plug tap completes threads right to the bottom of blind holes. This set is an essential addition to any shipboard toolroom or offshore workshop.

Available in a range of common Whitworth coarse sizes, simply select the required thread size for your specific application. Each tap is made from premium high-speed steel and offers reliable service for both maintenance and fabrication tasks aboard commercial and recreational vessels.

Key Features

Technical Specifications

Thread TypeWhitworth Coarse (BSW)
Set IncludesTaper Tap, Intermediate Tap, Plug Tap
MaterialHigh-Speed Steel (HSS)
Cutting DirectionRight-hand
Flute TypeStraight flutes
Shank TypeRound shank with square drive
Available Thread Sizes1/4" to 1" (selected sizes)
ApplicationMarine engineering, ship repairs

Frequently Asked Questions

What is the difference between the three taps in the set?

The taper tap has a longer taper to start the thread easily, the intermediate tap further cuts the thread to around 75%, and the plug tap has a straight end and cuts the thread to the bottom of a blind hole. Use them in sequence.

Are these taps suitable for use on stainless steel?

Yes, when used with a suitable cutting lubricant. High-speed steel provides good wear resistance, but slower speeds and steady pressure are required to avoid work-hardening the stainless steel.

Can I use these taps manually?

Absolutely. They are hand taps with a square drive section that fits standard tap wrenches. For best results, keep the tap perpendicular to the work surface and apply steady, even turns.

Are the threads cut by these taps compatible with British Standard Whitworth bolts?

Yes, the taps are ground to the Whitworth Coarse (BSW) thread profile, which matches standard British Whitworth fasteners.

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