Simpson HDIA31 Hollow Drop-In Internally Threaded expansion Anchor 5/16" HT Heavy T Strap giving the screw the hardness

giving the screw the hardness needed to drill through metal framing components

Spindle lock

this left-oriented column cap helps distribute load from the beams and provides critical support at the connection point

This model ships with Strong-Drive SDS Heavy-Duty Connector screws for fast installation and a lower profile than standard through bolts

The countersunk head sits flush with the surface

Simpson HDIA31 Hollow Drop-In Internally Threaded expansion Anchor 5/16" HT Heavy T Strap giving the screw the hardnessThe Simpson Strong Tie HDIA31 Hollow Drop In Internally Threaded Expansion Anchor is an internally threaded, flush mount expansion anchor engineered for attaching threaded rod to support conduit, cables, and lighting. Manufactured by Simpson Strong Tie, this anchor is uniquely designed to perform in both hollow base materials such as CMU and hollow core plank and solid base materials including brick, normal weight concrete, and lightweight concrete,