Tab dimensions and wire range
The 2-521104-2 is the 0.187" tab-width member of TE's Ultra-Fast quick-disconnect series, a fully insulated male terminal for 18-22 AWG wire. Tab thickness is 0.032" (0.81mm) with tin-plated brass contact material; the insulation barrel accepts a maximum insulation diameter of 0.135" (3.43mm).
Tab thickness variant in the series
Within the 0.187" tab-width Ultra-Fast male terminals, the 2-521104-2 uses a 0.032" tab thickness while the sibling 2-521102-2 uses a thinner 0.020" (0.51mm) tab — the wire range, insulation diameter, and overall length are shared across both.