1-190

191-225 228-376 377-435 436-699 701-861

862-914

922-964
National Insulator Association (NIA) logo

Threaded Unipart Porcelain Insulators

From the United States

 

Note:  Click on each insulator for larger pictures and more information!

U-2 through U-43 are pony styles with one skirt & wire groove

U-4

U-11A

U-12

U-14

U-18

U-21

U-26

U-32

U-38

U-46 through U-76 are exchange styles with one skirt & two or more wire grooves

U-48

U-50

U-55

U-57

U-61

U-64

U-76

U-81 through U-100 are through pin hole styles including mine and transposition insulators 

U-81

U-84

U-89

U-94

U-104 through U-180 are telephone & telegraph styles
   

U-105

U-106

U-109

U-118

U-129

U-138

U-148

U-154

U-167

U-169

U-171A

U-173

U-180

U-181 through U-190 are specialty styles including no-tie designs
   

U-183

U-184

U-186

U-188

U-189

U-189A

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