Brass Lamp Necks - Couplings are threaded differently at each end. One end screws onto 1/8 IP the other end screws on to 1/4 IP. Very useful when joining these two commonly used lamp thread sizes. Solid Brass
1/8 IP - 3/8" outside diameter, screws into most lamp sockets
1/4 IP - 1/2" outside diameter
1/8 IP Top
1/4 IP Bottom
Standard Lamp Thread Sizes
Lamp Thread Sizes
Standardized thread sizes for lamps enable many types of parts to be connected. It is imperative to know the thread size when replacing any antique lamp parts. List of common lamp threads and there uses provides a quick reference.
8-32 - 5/32" outside diameter, used as holder screws with some glass shades.
1/4-20 - 9/16" outside diameter
1/4-27 - 7/32" outside diameter, used on harp posts & most lamp finials.
1/8 IP-27 - 3/8" outside diameter, very common thread used on table lamps, socket caps, and some finials. Allows electrical wire to pass through pipe.
1/4 IP-18 - 1/2" outside diameter, used on floor lamps, clusters, ceiling fixtures, and floor lamp bases.
3/8 IP - 5/8" outside diameter, used on chandeliers and hanging lamps.
F: designates a female thread - part is tapped having interior threads.
M: designates a male thread - threaded with exterior threads.
Watts: Volts multiplied by Amps
Amps: Watts divided by Volts
Volts: Watts divided by Amps
Free Shipping on Orders over $99 to the 48 contiguous US
Low $6.95 flat-rate shipping for orders less than $99 to the 48 contiguous states, USA
Returns are accepted within 60 days of receipt for a full merchandise refund - your original payment method will be credited for the merchandise amount.