JMIKS Fasteners supplies sleeve and taper nut anchors in mild steel and stainless steel. This anchor has a threaded stud, an expansion sleeve and an internally threaded taper nut, and it needs only a shallow hole.
Sleeve with an internally threaded taper nut, for the lowest anchoring depth.
When the nut on the stud is tightened, the taper nut at the other end is pulled into the sleeve.
The sleeve expands and grips the wall of the hole.
Use it where the concrete is thin or the hole cannot be deep, because it sets at a low anchoring depth.