3. Inspection, safety, and testing
In some padlock designs, the hole also serves as a small inspection or relief point. Professionals like locksmiths or quality-control technicians can use it to:
– Check whether the internal parts are damaged or misaligned
– See signs of tampering or forced entry
– Test internal movement without fully dismantling the lock
Manufacturers may also use that opening during production and testing, making sure everything inside the lock is working properly before it leaves the factory.
4. Why some newer padlocks don’t have the hole
If you look closely, you’ll notice not all modern padlocks include this feature. That’s not a mistake — it usually means the lock has been engineered differently.
Weatherproof and marine-grade padlocks often rely on:
– Rubber seals
– Protective outer casings
– Special coatings and internal designs
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