600QD/L/QDA Aluminum Slide series. Jonathan Engineered Solutions offers a complete line of high-quality aluminum ruggedized slides. Our array of aluminum slides includes ball bearing slides, friction slides, roller bearing slides, and solid bearing slides. The 600QD/L/QD series aluminum slides are .50" x 5.50" tall and manufactured in high strength aluminum with MIL-A-8625A, Type II, Class 1 finishes. Optional finishes and customization are available. The 600QD/L/QD is a 3 section slide with a load rating of up to 350 lbs. The majority of our aluminum slides are custom engineered for specific applications. We also carry a broad line of standard aluminum slides, available with various lengths, travels, features, functionality, and more. With an accumulated mechanical engineering knowledge base that relates to aluminum slides, custom manufacturing capabilities, and a global footprint, we are the ideal source for all of your aluminum slide requirements.