Hadley Horns & Accessories

Hadley is recognized nationally and internationally as a leading manufacturer or air horn systems. Hadley air horns are installed as original equipment in a variety of semi trucks. And when paired to Hadley air compressors, these horns are the most popular choice for many other types of vehicles including SUVs, pickups, RVs, motorcycles, and more. They produce a distinctive sound that makes your presence heard from far away, and that can’t be mistaken for anything else. This low, throaty tone became known as a characteristic sound of a big rig pounding the highways of America, and it is even called by many as the “sound of safety.”

The company traces its roots to Harold Hadley’s invention of a dual-trumpet horn powered by the R-134a refrigerant, which was aimed at increasing the safety of sailors on vessels. Referred to as the “Hadley Horn,” this product formed the foundation for the enterprise that Mr. Hadley established in 1945 in Toledo, Ohio. From the marine sector, the company quickly expanded into other industries including the automotive and truck markets. It is also a big player in the heavy-duty truck mirror business. Hadley mirrors are sold to OEMs and used by truck fleets throughout North America.

In addition to air horns, Hadley develops and manufactures a range of other air management parts and systems. Hadley valves have been around since 1963, first used in luxury car pneumatic suspension systems. The company’s valves and Ride Control Systems are the first choice of commercial vehicle makers and fleets these days. The award-winning SmartValve is an all-in-one truck-specific electronic height control system that made the life of truckers much easier. It eases and speeds up the drop-and-hook process eliminating the risk of injury to the driver, while also increasing fuel economy as it automatically changes the rig’s ride height depending on the speed.