A threaded adjustable-height insert may be installed in a bore of a sandwich panel, such that the insert may be configured to transfer a load to the sandwich panel. The threaded adjustable-height insert may include a first insert part and a second insert part that may be selectively operatively positioned with respect to each other. The overall height of the threaded adjustable-height insert may be adjusted by longitudinally sliding the second insert part with respect to the first insert part and rotating the second insert part with respect to the first insert part. Presently disclosed threaded adjustable-height inserts may be configured for flush installation in a sandwich panel. Methods of installing such threaded adjustable-height inserts and adjusting the height of the same are also disclosed.