How to specify a sleeve anchor into existing concrete for later threaded bolt insertion.

Thanks for the question. It would depend upon the required load, conditions and any fire rated requirements. We do have a number of sockets mechanical or resin typically from M8 - M20 diameter that could be suitable. Resin sockets such as the HIS-N / RN which can be used with injection or capsule resins or mechanical such as HSC-I, HKD or HUS3-6I etc . Please note though that the sockets are not fully threaded as the limitation is the concrete rather than the steel / steel thread connection inside the socket.