Harry Soref: Master Lock and the Laminated Padlock
Harry Soref (1887–1957) was a traveling locksmith and security entrepreneur who founded Master Lock in Milwaukee in 1921. His insight: stack thin steel laminations riveted together to create a padlock body stronger and cheaper than solid cast designs.
The laminated padlock became a global visual shorthand for portable security — school lockers, construction fences, and gym bags. Soref proved that manufacturing process innovation could matter as much as mechanism invention.
Early Life
Soref worked as a locksmith and inventor, patenting improvements in padlock construction. He reportedly pitched bankers with a prototype built from laminated layers — convincing investors that mass production was viable.
The 1924 Patent
Laminated bodies distributed force across rivets and layers, resisting prying better than many solid brass competitors at lower cost. Master Lock scaled production as demand for consumer padlocks exploded in the 20th century.
Marketing and Culture
Master Lock's television ads — including the famous shotgun test — cemented brand recognition. The silver laminated padlock with rounded shoulders is instantly recognizable decades later.
Relationship to Padlock History
Soref did not invent the padlock — Romans and Chinese smiths did centuries earlier — but he industrialized the category for everyday consumers. Read our padlock history article for broader context.
Legacy
Master Lock remains a dominant brand under Fortune Brands. Soref's story illustrates how American manufacturing, locksmith craft knowledge, and bold marketing combined to shape a product category billions of people touch yearly.