A multiple layer conductive pin assembly for a harsh environment connector or penetrator, comprising: a pre-formed outer tube of non-conductive, insulating material having a through bore and opposite first and second ends; a conductive shaft (35, 36) extending through the tube and having opposite first and second ends extending outwardly from opposite ends of the tube; an intermediate layer of conductive or semi-conductive material, the intermediate layer extending at least between the first and second ends of the tube; characterized in that: the intermediate layer is positioned between the shaft (35, 36) and the outer tube and is bonded substantially void-free to the tube through bore; the conductive shaft (35, 36) comprises first and second conductor portions, the first conductor portion extending through the first end of the bore and terminating short of the second end of the bore and having an outer end engageable with a first cable, the second conductor portion extending through the second end of the bore and terminating short of the first end of the bore and having an outer end engageable with a second cable; the conductive pin assembly further comprises a first metal sealing sleeve secured to the first end of the outer tube and to the first conductor portion to form a first hermetic seal, and a second metal sealing sleeve secured to the second end of the outer tube and to the secured conductor portion to form a second hermetic seal, the intermediate layer extending over the respective first and second ends of the outer tube between the respective first and second metal sealing sleeves (44, 45) and the outer tube; the intermediate layer comprises a coating of semi-conductive material on the inner surface of the tube through bore, a layer of semi-conductive material, or a coating of conductive material different from the material of the conductor shaft (35, 36) which is adhered to the tube through bore; and wherein the conductor portions have slidably engaged inner ends which are in electrical communication inside the through bore. a pre-formed outer tube of non-conductive, insulating material having a through bore and opposite first and second ends; a conductive shaft (35, 36) extending through the tube and having opposite first and second ends extending outwardly from opposite ends of the tube; an intermediate layer of conductive or semi-conductive material, the intermediate layer extending at least between the first and second ends of the tube; characterized in that: the intermediate layer is positioned between the shaft (35, 36) and the outer tube and is bonded substantially void-free to the tube through bore; the conductive shaft (35, 36) comprises first and second conductor portions, the first conductor portion extending through the first end of the bore and terminating short of the second end of the bore and having an outer end engageable with a first cable, the second conductor portion extending through the second end of the bore and terminating short of the first end of the bore and having an outer end engageable with a second cable; the conductive pin assembly further comprises a first metal sealing sleeve secured to the first end of the outer tube and to the first conductor portion to form a first hermetic seal, and a second metal sealing sleeve secured to the second end of the outer tube and to the secured conductor portion to form a second hermetic seal, the intermediate layer extending over the respective first and second ends of the outer tube between the respective first and second metal sealing sleeves (44, 45) and the outer tube; the intermediate layer comprises a coating of semi-conductive material on the inner surface of the tube through bore, a layer of semi-conductive material, or a coating of conductive material different from the material of the conductor shaft (35, 36) which is adhered to the tube through bore; and wherein the conductor portions have slidably engaged inner ends which are in electrical communication inside the through bore. the intermediate layer is positioned between the shaft (35, 36) and the outer tube and is bonded substantially void-free to the tube through bore; the conductive shaft (35, 36) comprises first and second conductor portions, the first conductor portion extending through the first end of the bore and terminating short of the second end of the bore and having an outer end engageable with a first cable, the second conductor portion extending through the second end of the bore and terminating short of the first end of the bore and having an outer end engageable with a second cable; the conductive pin assembly further comprises a first metal sealing sleeve secured to the first end of the outer tube and to the first conductor portion to form a first hermetic seal, and a second metal sealing sleeve secured to the second end of the outer tube and to the secured conductor portion to form a second hermetic seal, the intermediate layer extending over the respective first and second ends of the outer tube between the respective first and second metal sealing sleeves (44, 45) and the outer tube; the intermediate layer comprises a coating of semi-conductive material on the inner surface of the tube through bore, a layer of semi-conductive material, or a coating of conductive material different from the material of the conductor shaft (35, 36) which is adhered to the tube through bore; and wherein the conductor portions have slidably engaged inner ends which are in electrical communication inside the through bore.