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Basic Lamp Assembly Guide

Choosing the Correct Size Lamp Shade & Harp (Shade Holder)

Generally, the height of a lamp shade should be the same or slightly shorter than the height of the lamp body. The circumference of the shade bottom should be approximately 2-1/2 times the circumference of the widest part of the lamp body. The shade should be placed so it covers the socket when viewed at eye level. 

Note: 2-Piece Harps make it easy to switch to larger or smaller Harps.

Socket Assembly & Lamp Wiring Guide

  • Place steel washer, rubber washer & locknut onto end of threaded rod. 
  • Insert threaded rod into your lamp base. 
  • Add a rubber washer & locknut to top of threaded rod. 
  • Tighten against top of your base finger-tight. 
  • Slip vase cap, neck, harp base & socket bottom onto threaded rod & tighten finger-tight. 
  • Run lamp cord up through threaded pipe as shown in illustration below.
  •  Make an electricians' knot to prevent wire from being accidentally pulled loose.
  • If necessary, carefully strip 3/4" of insulation from end of lamp cord. 
  • If ends are not tinned, twist each section tightly. 
  • Wrap the wire with smooth insulation clockwise around the brass "hot" terminal screw. 
  • Tighten screw. 
  • Wrap the wire with ribbed insulation clockwise around the silver "neutral" terminal screw. 
  • Tighten screw.
  • If using a shell-type socket, press cover securely into socket's base.

Wiring Guide

Thread Size Comparison

1/4-27 Harp Tops
Measures 1/4" O.D. with 27 threads per inch.

1/8 IP Lamp Pipe & Nipple Size
Measures 3/8" O.D. & 9/32" I.D. with 27 threads per inch. Slips into a 7/16" diameter hole.

Note: 1/8 IP (Iron Pipe) does NOT refer to an actual measurement. It is just a trade designation for the standard size of threaded lamp pipe used in lamp making.

Check out our selections of Electrical, Lighting & Lamp Making supplies:

Lamp Pipes & Threaded Nipples

Cord Sets

Light Bulbs


Lamp Finials, Loops, Spindles, Necks & Spacers

Lamp Harps & Shade Holders

On/Off Switches & End Plugs

Lamp Making Hardware

Check Rings

Socket Covers, Sleeves & Chains

Wood Lamp Base

Lamp Accessories

Adapters for Lamp Pipes

National Artcraft Co.
300 Campus Drive, Aurora, Ohio 44202 USA
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