Manufacturer's secrets: What do the letters YKK mean on zippers?


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Manufacturer's secrets: What do the letters YKK mean on zippers?
Source
Manufacturer's secrets: What do the letters YKK mean on zippers? - Fastener, Lock, Lightning, Longpost
Manufacturer's secrets: What do the letters YKK mean on zippers? - Fastener, Lock, Lightning, Longpost
Manufacturer's secrets: What do the letters YKK mean on zippers? - Fastener, Lock, Lightning, Longpost
Manufacturer's secrets: What do the letters YKK mean on zippers? - Fastener, Lock, Lightning, Longpost
Manufacturer's secrets: What do the letters YKK mean on zippers? - Fastener, Lock, Lightning, Longpost

Lock Fastener Lightning
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