Which part of a die ensures the alignment of the die with the workpiece during threading?
The lead-in chamfer
A die cuts external (male) threads on a rod or bolt, and it must start square and centred on the workpiece.
The lead-in chamfer is the tapered mouth of the die; its bevelled starting threads engage the rod gradually and guide the die into alignment with the workpiece as cutting begins.
The central hole sets thread size, the adjusting screw controls thread depth, and the split slot allows size adjustment, but none of these performs the initial alignment.
Hence, the answer is the lead-in chamfer.
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