There are many ways to align components — the challenge for Design Engineers is choosing the best solution at the lowest cost.
The most common, and often most expensive, Alignment Dowels are manufactured per ISO 8734. These precision ground “parallel” pins provide excellent positional tolerance at a cost. Ground Dowels require extremely tight hole tolerances. In addition, this solution is typically through hardened for strength or case hardened for wear resistance. If the pin’s sole purpose is for alignment, the heat treating process adds cost without any functional benefit.
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