Columbia Manufacturing - Bracket for Pole Top
Columbia MFG, LLC
Model PTB-120-8 Mounting Bracket For
Pole Top Transmission Insulators
Model PTB-120-8 Mounting Bracket provides a secure, convenient method for mounting pole top transmission insulators. The bracket will accommodate insulators through 230 KV having either 7/8" center bolt or 5" bolt circle bases. Attachment to the pole is by means of through bolts. The bracket shape accommodates a wide range of pole diameters. Photos below illustrate the trim silhouette of a typical installation and details of the pole contact area.
Materials - Steel plate, ASTM A-36, hot dip galvanized. Continuous fillet welding.
Bracket Top - 1/2" x 6 1/2" diameter. Eight 11/16" holes on a 5" bolt circle, 15/16" center bolt hole.
Bracket - 3/8" formed steel plate. Two 15/16" diameter holes for 7/8" through-bolts.
Bolts and Washers - Selected and supplied by customer as required by pole diameters and individual construction standards.
Catalog No.: PTB-120-8
Weight (each): 30 1/2 lbs
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This page revised 08/14/18