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
Common Lamp Thread Sizes
1/8 IP - 3/8" outside diameter, screws into most lamp sockets
Thank you so much for providing my mother's lamp neck. I finally found the proper neck on your site. Two different measurements on top and bottom. Top 1/8" and bottom 5/8". Is an older lamp so was hard to find the different size. Worked perfectly. I also found the antique knobs and such very authentic and I will be ordering from you when completing my renovations. Thank you for your prompt shipping. I would definitely recommend this company. Thank you!