Master Lock
An American security-products brand best known for padlocks, combination locks, safes, and related locking systems.
Last updated October 14, 2026
AI crawler reads
2requests
1companies- Anthropic2
- Profile
- 2
- Controversies
- 0
- JSON · MD
- 0
- First read
- Nov 4, 2026
- Latest read
- Nov 4, 2026
From this site's server log
Overview
Master Lock is an American security-products brand and company whose name is closely associated with padlocks, combination locks, safes, and other locking and access-control products. The business was established in Milwaukee in 1921 by locksmith and inventor Harry Soref together with P. E. Yolles and Sam Stahl. Its origins lie in Soref's work as a traveling locksmith and in his development of a laminated-steel padlock body. The design layered steel plates to create a strong lock body at a practical manufacturing cost. After large manufacturers showed little interest, the founders decided to produce the locks themselves, initially operating with five employees. A patent for the laminated-lock design was granted in 1924. Sam Stahl played a central role in developing the company into a substantial lock manufacturer. The founders worked closely together until Soref's death in 1957, after which Stahl continued to lead the business. The company remained family-controlled for a period, with Soref's children eventually taking over management and later selling the business to American Brands in 1970. American Brands was subsequently renamed Fortune Brands. In 2011, Fortune Brands separated its businesses, and Master Lock became part of Fortune Brands Home & Security, the predecessor of today's Fortune Brands Innovations. Master Lock's consumer identity was built not only through product availability but also through highly memorable durability advertising. Beginning in 1974, the company ran a Super Bowl commercial showing one of its locks surviving a rifle shot. The advertisement supported the slogan "Tough Under Fire" and became a recurring part of the brand's marketing history. Master Lock later repeated variations of the demonstration, including a very short 1998 advertisement. The campaign positioned the brand around visible physical strength and practical dependability rather than technical sophistication alone. At its height in the early 1990s, Master Lock employed approximately 1,300 people in the Milwaukee area. From 1993 onward, much of its manufacturing shifted to China, and some production later moved to Mexico, partly in response to changing trade and cost conditions associated with NAFTA. The changes eliminated more than 1,000 jobs at the Milwaukee plant, although the site continued to manufacture selected products using increasingly automated processes. The company subsequently returned some work to Milwaukee. Around 2010 and 2011, production of combination locks, subassemblies, and keys contributed to the return of jobs from China, while the company continued to use Chinese factories and suppliers and operated a maquiladora near the Arizona-Mexico border. The brand expanded beyond conventional utilitarian padlocks during the 2000s. Its 2002 Titanium Series represented a major visual and material redesign, combining a stainless-steel body with titanium-reinforced steel and protective shrouding. The series was intended to add color and design appeal to a category traditionally sold primarily through hardware departments. Master Lock also introduced digital and software-linked offerings, including the Master Lock Vault password-management service in 2010 and the battery-powered, programmable dialSpeed combination padlock in 2012. In 2003 it acquired American Lock, adding that company's intellectual property and product assets. In 2014 it acquired SentrySafe for $117.5 million, broadening its presence in safes and secure storage. The company's manufacturing footprint changed again in the 2020s. Master Lock announced in May 2023 that its Milwaukee plant would close, and the closure was completed in March 2024. More than 300 employees were laid off during the process. Master Lock remains an active brand within Fortune Brands Innovations, serving residential, commercial, industrial, travel, vehicle, and personal-security use cases. Its portfolio spans traditional keyed and combination locks, connected access products, sa…
History
Master Lock traces its origins to Harry Soref, a locksmith and inventor who worked across the United States, Canada, and Mexico. Before establishing the company, Soref developed a lock intended to protect military equipment and founded a business associated with the manufacture of master skeleton keys. In 1919 he devised a laminated-steel padlock design. Instead of forming the lock body from a single large piece of metal, the design used layered steel plates, allowing the company to produce a strong body economically. Soref was unable to persuade major manufacturers to commercialize the design. He therefore joined with P. E. Yolles and Sam Stahl to establish Master Lock in Milwaukee in 1921. The young company began with five employees, and in 1924 received its first patent for the laminated-lock design. Stahl became an important operating leader and helped transform the business into a major lock manufacturer. The three founders remained closely involved until Soref died in 1957. Stahl then continued to lead the company, while ownership later passed to Soref's children. The Soref family eventually sold Master Lock to American Brands in 1970. American Brands later changed its name to Fortune Brands. One of the defining events in the brand's consumer history came in 1974, when Master Lock used a Super Bowl commercial to show a rifle shot striking a lock without destroying it. The demonstration supported the slogan "Tough Under Fire" and became a recurring advertising format. A later one-second version appeared in 1998. This marketing helped turn a functional hardware product into a widely recognized consumer brand. During the early 1990s, Master Lock reached a peak of approximately 1,300 employees in the Milwaukee area. Beginning in 1993, the company moved substantial manufacturing to China and later to Mexico. The changes eliminated more than 1,000 positions at the Milwaukee plant, although automated production continued there. In the early 2010s, some manufacturing work returned from China to Milwaukee, including combination locks, subassemblies, and keys. At the same time, the company retained relationships with Chinese factories and suppliers and continued operating a labor-intensive maquiladora near the Arizona border. Product development broadened in the 2000s. In 2002, Master Lock introduced the Titanium Series, its first major redesign in roughly half a century. The locks used titanium-reinforced steel, stainless-steel bodies, and shrouding that enabled a wider range of colors and styles. The company sought placement for these products outside traditional hardware aisles, reflecting an effort to make security products more visually appealing. In 2003, it acquired American Lock. In 2010, it launched the Master Lock Vault password-management service, and in 2012 it introduced the electronically operated dialSpeed combination padlock, which provided illuminated controls and programmable combinations. In 2011, the company became part of Fortune Brands Home & Security after Fortune Brands reorganized its businesses. In 2014, Master Lock purchased SentrySafe for $117.5 million, adding a significant safe and secure-storage business. Master Lock's products have also attracted criticism from security researchers and lock enthusiasts. Reference material has described many models as vulnerable to techniques including lock picking, bumping, or other bypass methods, particularly where designs use standard cylindrical pins or insufficiently effective security pins. These criticisms concern product security characteristics rather than a documented corporate scandal in the supplied sources. In May 2023, Master Lock announced that its Milwaukee plant would close. The closure was completed in March 2024, with more than 300 employees laid off. Master Lock continues as an active subsidiary and brand of Fortune Brands Innovations. Its current scope includes keyed and combination locks, digital access products, safes, vehicle and bicycle security, industrial applications, and related security hardware.
- 2024
Milwaukee plant closure completed
[1]The closure was completed in March, with more than 300 employees laid off during the process.
- 2023
Milwaukee plant closure announced
[1]Master Lock announced plans to close its Milwaukee manufacturing plant.
- 2014
SentrySafe acquisition
[1]Master Lock acquired SentrySafe for $117.5 million.
- 2012
dialSpeed launches
[1]Master Lock introduced a battery-powered, illuminated, programmable combination padlock.
- 2011
Master Lock becomes part of Fortune Brands Home & Security
[1]A Fortune Brands corporate separation placed Master Lock in the newly formed home and security company.
- 2010
Master Lock Vault launches
[1]The company entered password-management and software-supported security services with Master Lock Vault.
- 2003
American Lock acquisition
[1]Master Lock acquired American Lock and its intellectual and material property.
- 2002
Titanium Series launches
[1]The Titanium Series introduced a major redesign emphasizing materials, color, and consumer-facing product aesthetics.
- 1993
Manufacturing relocation begins
[1]Master Lock began moving substantial manufacturing to China and later Mexico, reducing employment at its Milwaukee plant.
- 1974
The Tough Under Fire advertising campaign begins
[1]A Super Bowl advertisement demonstrated a Master Lock surviving a rifle shot and established one of the brand's best-known advertising formats.
Products and positioning
Durable, recognizable, mass-market security products emphasizing physical strength, practical reliability, and broad consumer and commercial availability.
Padlocks · 1921
Laminated-steel padlocks
The company's historic core product is the laminated-steel padlock, built from layered steel plates intended to provide a strong and economical lock body. Master Lock sells versions for personal, residential, commercial, vehicle, and industrial uses, with variations in shackle dimensions, body protection, keying, and weather resistance.
Padlocks · 2002
Titanium Series
Introduced in 2002, the Titanium Series was a major design departure for the brand. It combined a stainless-steel body with titanium-reinforced steel and protective shrouding. The series emphasized visual variety and color as well as security, helping position a traditionally utilitarian product for broader retail presentation.
Combination locks
Combination locks
Master Lock's combination-lock portfolio includes dial and other resettable formats that avoid the need for a conventional key. These products are offered for school, gym, luggage, residential, commercial, and general personal-security applications.
Electronic combination locks · 2012
dialSpeed
The dialSpeed line, introduced in 2012, used battery power, an illuminated face, and programmable combinations. It was designed to provide keyless access while retaining a padlock form factor. Reference material also describes a master unlocking code administered through the company's website.
Digital security service · 2010
Master Lock Vault
Master Lock Vault was introduced in 2010 as a password-management service supported by a website and software applications for use across devices. It represented the brand's move beyond purely mechanical locking products into software-linked security and access management.
Safes and secure storage
SentrySafe
SentrySafe became part of the Master Lock business through the 2014 acquisition. The line broadens the portfolio from portable locks to safes and secure storage products for documents, valuables, personal items, and other contents requiring protection.
Industrial security hardware
Industrial sealing and locking mechanisms
During the 2000s, Master Lock expanded into products beyond conventional padlocks, including mechanisms used for industrial space-cover sealing and related specialized security applications. These products serve institutional, commercial, and industrial requirements rather than only household locking needs.
Marketing campaigns
- 1998One-second Tough Under Fire advertisement
United States
Master Lock condensed its durability demonstration into a one-second advertising spot, preserving the visual shorthand of a lock surviving gunfire.
Outcome. The short-form execution extended the campaign's recognizable visual identity.
- 1974Tough Under Fire
United States
Master Lock used a Super Bowl advertisement to show a rifle shot striking one of its locks without destroying it. The campaign made visible physical endurance the central proof point of the brand and was repeated in similar forms during later Super Bowl advertising.
Outcome. It became the company's signature advertising concept and helped establish Master Lock as a widely recognized consumer lock brand.
Brand decisions
2023
Decision to close the Milwaukee plantStrategyBackground
Master Lock announced a further change to its manufacturing footprint.
Action taken
The company announced that its Milwaukee manufacturing plant would close.
Aftermath
The closure was completed in March 2024 and resulted in layoffs affecting more than 300 employees.
2014
Acquisition of SentrySafeM&ABackground
Master Lock sought to broaden its security offering beyond locks into secure storage.
Action taken
The company acquired SentrySafe for $117.5 million.
Acquisition price. $117.5 million (2014 acquisition)
2012
Launch of the dialSpeed lockProduct launchBackground
Master Lock was developing keyless and electronically assisted alternatives to conventional combination padlocks.
Action taken
It launched the battery-operated dialSpeed with an illuminated face, user-programmable combinations, and a web-accessible master code.
2011
Corporate separation into Fortune Brands Home & SecurityStrategyBackground
Fortune Brands reorganized its portfolio by separating home-security operations from its beverage business.
Action taken
Master Lock was placed within Fortune Brands Home & Security, later known as Fortune Brands Innovations.
Aftermath
The brand continued as a subsidiary within a dedicated home and security products group.
2010
Entry into password managementProduct launchBackground
The brand was extending its security proposition into software and device-supported services.
2003
Acquisition of American LockM&ABackground
Master Lock sought to expand its lock portfolio and intellectual-property base.
Action taken
It acquired Illinois-based American Lock and the company's intellectual and material property.
2002
Launch of the Titanium SeriesProduct launchBackground
Master Lock sought to update the appearance and retail positioning of a traditionally utilitarian lock category.
Action taken
It introduced padlocks using titanium-reinforced steel, stainless-steel bodies, protective shrouding, and expanded color options.
Aftermath
The line represented a major product redesign and was intended for display beyond conventional hardware departments.
1993
Shift substantial manufacturing overseasStrategyBackground
Master Lock faced changing manufacturing economics and trade conditions during the 1990s.
Action taken
The company began moving much of its manufacturing to China and later moved some production to Mexico.
Aftermath
More than 1,000 Milwaukee-area jobs were eliminated, although automated manufacturing continued at the plant and some work later returned.
Sources1 sources
Cite this profile: Cite the canonical profile. /brand-wiki/master-lock · Editorial policy · How profiles are compiled