Cleveland C54826 Straight Flute Hand Tap M18-1.50 Plug 4 Flutes Metric

Cleveland M18×1.50 Straight Flute Hand Tap

The Cleveland C54826 is a straight-flute hand tap cut for M18×1.50 metric threads in a plug-chamfer style. It targets mechanics and fabricators who need to cut internal threads by hand in through-holes or blind holes with enough clearance for chip evacuation. Four flutes and high-speed steel construction give a balance of strength and chip room for general-purpose tapping. The D6 thread limit and 6H class of fit suit standard tolerance requirements.

Upgrade from worn or undersized taps

A fresh C54826 replaces dull, chipped or incorrect-pitch taps that produce loose or oversized threads. The jump is worth it when an existing tap no longer holds the 75 percent thread depth at the 16.50 mm drill size or when the thread limit has drifted from D6. It also steps up from taper-chamfer taps when a plug lead is needed to start threads closer to the bottom of a blind hole. The bright uncoated finish performs best in low-alloy steels and non-ferrous metals where coatings add no benefit.

Hand-tapping basics and common pitfalls

Start the tap square to the 16.50 mm drilled hole and use a tap wrench matched to the 102.39 mm overall length for leverage. Apply steady pressure with cutting fluid and reverse every half-turn to break chips in the 46.04 mm thread length. What usually goes wrong: drilling the hole off-size or off-centre, running the tap dry, or forcing a misaligned start — any of these can snap the flutes or cut a bell-mouthed thread that will not gauge to 6H.