Threaded Unipart Porcelain Insulators From the United States

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

U-228 through U-274 are side tie styles with no extended skirt, most are also signal styles

U-228 U-228A U-228B U-229 U-229A U-230 U-231 U-234 U-236 U-236A U-237 U-238 U-238A

U-238B U-239 U-239A U-239B U-239C U-239D U-240 U-241 U-241A U-241B U-242 U-243

U-244 U-244A U-244B U-246 U-246A U-247 U-248 U-248A U-249 U-250 U-252 U-255 U-256

U-256A U-257 U-258 U-259 U-260 U-265 U-265A U-265B U-266 U-266A U-267 U-267A

U-268 U-268A U-268B U-268C U-269 U-269A U-270 U-270A U-272 U-274 U-274A U-274B

U-277 through U-337 are side tie styles with extended inner skirts, most are also signal styles

U-274C U-278 U-279 U-280 U-280A U-280B U-281 U-282 U-282A U-283 U-283A U-285

U-286 U-286A U-287 U-288 U-288A U-289 U-290 U-290A U-291 U-291A U-292 U-292A

U-293 U-293A U-294 U-294A U-295 U-295A U-295B U-296 U-297 U-297A U-298

U-299 U-300 U-301 U-303 U-304 U-305 U-308 U-308A U-309 U-310 U-310A

U-311 U-313 U-313A U-314 U-317 U-317A U-318 U-320 U-320A U-321 U-322

U-323 U-326 U-330 U-331 U-331A U-332 U-334 U-335 U-337

U-339 through U-339C are through hole styles and all scarce to rare.  The intended use is not known.

U-339 U-339A U-339B U-339C

U-340 through U-376 are larger side tie styles.

U-342 U-343 U-344 U-344A U-344B U-348 U-351 U-353

U-354 U-356 U-356A U-356B U-357 U-358 U-359 U-361

U-363 U-366 U-367 U-368 U-370 U-372

U-376 through U-376D are Etheridge patent pin styles

U-376 U-376A U-376B U-376C U-376D

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