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 T-Slot bolts DIN 787 ELESA+GANTER® Discover the product specifications and technical features bolt slot Overview The 916'' EZ Stab Bolt Slot System by CertainTeed is an innovative and high-performing suspension system that is available in an 14 reveal and

bolt slot Replacement T-Slot bolt for FeatherBoard and DTFeatherBoard

bolt slot grid 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 BOLT SLOT SYSTEM