Lamp Pipe Size Chart

Across-The-Board Woodworks

Hannah Murphy Lamps & Lampshades

Hard-to-find lamp parts for restoring antique and vintage lamps, or building new lamps

Note on Thread Sizes for Pipe, Nipples, & Harps

Most Harp Tops and finials are threaded "1/4-27" which is the industry standard for 1/4" outside diameter post.

Table lamp pipe, socket caps, and some finials are "1/8 IPS", industry standard 3/8" outside diameter.

Floor lamp pipe & bases,  and clusters are  "1/4 IPS", industry standard 1/2" outside diameter.

1/4-27	1/8  IPS	1/4 IPS	3/8 IPS	1/2 IPS
1/4" diameter Harp Tops & most finials	3/8" diameter Table lamps, socket caps, and some finials	1/2" diameter Floor lamps and Cluster bases	5/8" diameter Chandeliers & other heavy duty applications	3/4" diameter Large chandeliers & heavy duty applications

A few floor lamps and bridge lamps made in the 1920's used 3/8 IPS pipe, but most have 1/4 IPS pipe.

 

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