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

U-229

U-236

U-239

U-239A

U-241A

U-247

U-257

U-259

U-260

U-265

U-267

U-267B

U-274A

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

U-280A

U-282

U-284

U-288A

U-291

U-291A

   

U-295A

U-298

U-300

U-308B

U-320

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

U-339A

U-339B

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

U-342

U-356A

U-359

U-368

U-376C

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