4. Reduced Weight Without Losing Strength
The hole slightly reduces the amount of metal used without weakening the pin. It’s a small efficiency trick—less material, same functionality.
5. A Design That Stood the Test of Time
The safety pin was invented in 1849, and its design has barely changed since then. The tiny hole is a reminder that even the most ordinary objects are carefully engineered, with every detail serving a purpose.
In Short
That tiny hole in a safety pin helps with spring strength, manufacturing precision, practical sewing uses, and material efficiency. It’s a perfect example of how smart design can hide in plain sight—right in your sewing kit or laundry drawer.
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