All hubs have NPT threads with a minimum of five full threads and integral bushing, internal grounding screw standard on boxesSuitable for wet locations when used with gasketed coversUse blank bodies where special arrangements of conduit hubs or entrances are requiredAll cover holes are #6-32 AWFGMounting lugs are standard on all FS and FD boxesAccommodate wiring devicesAct as pull boxes for conductors in a threaded rigid conduit system, including an internal ground screwProvide openings to make splices and taps in conductorsConnect conduit sectionsIndustrial grade device boxes and rain tight covers protect wiring devices, switches, electronic components and terminal blocks in dry, damp and wet locations0.755 to 0.810 in Dia throat(1) end hub cable entrySand cast Al alloy and sheet steel covers and neoprene gasketsZinc plated with aluminum acrylic paint finishClass 30 iron alloy materialFor used to provide access to conductors for maintenance and future system changes