Match the wrench size range to your tap's shank diameter. For example, if you're using an M5 tap, choose the M3–M6 variant whose chuck range covers that shank size. Using a wrench rated too large for a small tap risks slippage and broken taps.

Yes. The adjustable chuck grips the square shank found on plug, taper, and bottoming taps interchangeably, as long as the shank diameter falls within the selected variant's rated range.

This wrench is designed for use with standard HSS (high-speed steel) hand taps in mild steel, aluminum, brass, and plastic. For hardened or tool steel workpieces, the limiting factor is typically the tap itself rather than the wrench. Always use cutting fluid and apply steady, controlled torque.

Alloy steel can oxidize over time if left wet. After use, wipe the wrench dry and apply a light coat of machine oil to the chuck jaws and spindle to prevent surface rust and maintain smooth operation.

The chuck grips by shank diameter, not thread standard. If your inch-series tap's shank diameter falls within the selected variant's metric range, it will fit. Check your tap's shank diameter against the variant's chuck capacity before ordering.

Both start at M3, but the M3–M10 variant has a larger maximum chuck opening to accommodate bigger tap shanks up to M10. If you regularly use taps in the M6–M10 range, the M3–M10 variant gives you more flexibility without needing a second wrench.

Use the smallest-rated variant (M2–M4) for fine taps to maximize chuck grip precision. Apply light, even pressure, back off a quarter turn every half turn to break chips, and use tapping fluid. Avoid side-loading the tap — keep the wrench perpendicular to the workpiece at all times.