What is the name for a bolt hole with a slot that allows the bolt to be

What is the name for a bolt hole with a slot that allows the bolt to be bolt slot Specifications · Hanger Spacing: 4' - plf · Disinfectability: Fog, Spray, Wipe · Material: Hot-dipped Galvanized Steel · RoutSlot Spacing and UOM: Center bolt slot T-SLOT BOLT 12-13, 2 12

bolt slot BOLT SLOT SYSTEM

bolt x up slot Replacement plug for XLR chassis that are ambidextrous AND have bolt relief cuts to accept the plug Please examine the images on the product page showing Specifications · Hanger Spacing: 4' - plf · Disinfectability: Fog, Spray, Wipe · Material: Hot-dipped Galvanized Steel · RoutSlot Spacing and UOM: Center