The KIRK® SD Series of trapped key safety interlocks features the traditional keyed brass interlock design. This interlock series comprises a 7-pin nickel-silver key and a pin tumbler lock cylinder. The interlock housings are made from brass and the lock bolts are 5/8” diameter 303 stainless steel.
SD Series Keys
Our keys are made from a proprietary key section that can be provided only by the Kirk Key Interlock Company. This means that they cannot be copied or reproduced except by us; we keep meticulous records of all duplicate keys dating back to 1940 to ensure the complete safety of your interlock system.
SD Series Accessories
Kirk Key Interlock Company offers a complete range of accessories for our interlocks; auxiliary contacts, protective covers, bolt modifications and more. Click here to browse accessories.
SD SERIES: "STANDARD DUTY"
The KIRK® HD Series key interlocks are designed to withstand high temperatures and corrosives, making it the perfect solution for applications in outdoor or harsh environments. The unique cylinder mechanism has no openings and few moving parts, preventing dirt and debris from clogging the mechanism. Gasketed keys and dust covers further protect the cylinder from debris.
Constructed entirely from electropolished 316 stainless steel, KIRK® HD series safety interlocks offer high performance at temperatures exceeding 350ºC/700ºF. Electropolishing removes iron and nickel elements from the metal surface, generating a higher concentration of smooth corrosion resistant chromium oxide. This process passivates the 316 stainless steel, leaving a mirror-bright finish and further protecting the interlock from chemical activity.
Increases corrosion resistance
Removes contaminates, oxides and tarnishes
Improves surface smoothness by 50% and reduces surface friction
Reduces surface occlusions and directional lines by micro-deburring
The end result: every component of an HD series interlock is treated to withstand the harshest of environments.
HD Series Keys
HD Series keys are made from electropolished 316 stainless steel and are constructed to be robust in the toughest of environments. They will not snap under force, nor will they fall through standard floor grating, minimizing downtime due to key replacement. The unique design prevents key duplication or unauthorized mastering, ensuring the highest protection of your interlock scheme.
HD Series Accessories
Kirk Key Interlock Company offers a full range of accessories for our safety interlocks to form a comprehensive interlocking scheme; auxiliary contacts, protective covers, bolt modifications, lamicoid identification tags, and more. Click here to browse accessories.
HD SERIES: "HEAVY DUTY"
We offer two different series of products to meet the different needs of our customers. Our 'standard duty' SD series has been protecting lives since the 1930's and features the traditional keyed brass interlock, while our heavy duty interlocks were introduced in 2005 to satisfy the need for a more robust and durable range of interlocks. Click on an image below for further information about each of our series of safety interlocks.
Lock Bolt Material