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About Us


My name is Bill Smith, and I am the CEO of S5 Coupler Locks. S5's roots go back to when I researched coupler locks to keep my church's trailer safe. I realized that I wanted a more durable, tougher lock than what was on the market. My side project of making locks to fit my personal trailer couplers has turned into my passion. I build and sell products strong enough that I protect my own property with them. I am proud to provide affordable coupler locks that are just as tough as they look; deterring thieves simply through their presence. If their existence isn't enough, the thick steel and puck lock will do the trick. My goal is to keep your trailer in your possession. These locks are made to lock it and leave it! 

Back Story

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Why do you need our product?

It's simple. We are the most dependable, durable, economic option on the market. The FBI reported $33,043,046 in cargo theft in 2018, with only $7,538,754 total actually being recovered. We want to keep you from being one of the almost 80% who never get their cargo returned to them. 

We are significantly cheaper than our competition despite producing a thicker, stronger product. Don't be a statistic. Let us help deter potential thieves and keep your property with you, where it belongs. 

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About California Proposition 65

Proposition 65, officially the Safe Drinking Water and Toxic Enforcement Act of 1986, is a law that requires warnings be provided to California consumers when they might be exposed to chemicals identified by California as causing cancer or reproductive toxicity. The warnings are intended to help California consumers make informed decisions about their exposures to these chemicals from the products they use.


The California Office of Environmental Health Hazard Assessment (OEHHA) administers the Proposition 65 program and publishes the listed chemicals, which includes more than 850 chemicals. In August 2016, OEHHA adopted new regulations, effective on August 30, 2018, which change the information required in Proposition 65 warnings.

Additional Information about Proposition 65
For background on the new Proposition 65 warnings, see new-proposition-65-warnings

Proposition 65 and its regulations are posted at proposition-65-law-and-regulations

To give S5 Coupler Locks notice of an alleged violation of California Health and Safety Code Section 25249.5

pr 25249.6, please use our contact us form.

Proposition 65

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