Abstract: An apparatus capable of measuring pin protrusion and collar swage height in a fastener assembly. The apparatus comprises: a gage body; a shaft that is translatable along its axis; an instrument that measures the absolute axial position of the shaft relative to a zero position; pin protrusion and collar swage height measurement contact members coupled to the shaft; and a slotted gage plug that is rotatable and axially displaceable relative to the gage body. The gage plug sits on the swaged collar during measurements. When the collar swage height measurement contact member is disposed in the slot in the gage plug, pin protrusion can be measured. When the collar swage height measurement contact member is not disposed in the slot and instead rests on top of the gage plug, the collar swage height can be measured.