Protect Your Pricey Assets With Medium- and Heavy-Duty Interlocks

Kirk Key’s trapped key interlock systems ensure a pre-determined safety sequence is followed each time hazardous equipment is accessed or operated. Over the past 80 years, its Standard Duty brass interlocks have earned a reputation for dependable service in a range in applications. To meet the needs of more challenging environments, Kirk now offers Medium Duty and Heavy Duty Series options. Constructed to withstand exposure to extremes in temperature, weather, dirt, and corrosive elements, the MD and HD Series deliver long, reliable operation.The construction of both the MD and HD Series interlocks use 316 stainless steel cylinders, keys, bolts, and