Which part of a die ensures the alignment of the die with the workpiece during threading?
The lead-in chamfer
A die is the cutting tool used to form external (male) threads on a rod or bolt, and for the thread to be true the die must start square and concentric with the workpiece.
The feature that provides this self-centring start is the lead-in chamfer, a tapered bevel ground on one face of the die where the first few threads are cut shallower and flared out.
As the die is pressed onto the rod, this tapered mouth engages the workpiece gradually, drawing the die into line so the threads are cut straight rather than crooked or drunken.
The central hole is simply the threaded bore that determines the nominal thread size; it defines the thread but does not guide the initial alignment.
The adjusting screw opens or closes a split die slightly to set the exact thread depth or fit, a sizing function unrelated to squaring the start.
The split slot allows that small adjustment of diameter, again a size control rather than an alignment aid.
Hence, the answer is The lead-in chamfer.
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