The document applies to sets taps consisting of taper tap (V) and finishing tap (F) intended for manufacturing internal pipe threads where pressure-tight joints are not made on the threads (symbol G) according to DIN ISO 228-1 and whitworth pipe threads for tubes and fittings (symbol Rp) DIN 2999-1. Machine taps according to that standard are not suitable for whitworth pipe threads for pipe coupling in accordance with DIN 3858. DIN 2999-1 shall be replaced by DIN EN 10226-1(Entwurf).