Lamp Sockets can come with Four Choices of Female Threaded Bases or Hickeys.

They will accept these male threads.

If a Socket is Not Available in a Particular Size we can use a Nozzle as an Adapter. Nozzles are Female to Male Adapters.

If we have a lamp pipe that is Male 1/4-18 IPS and we have a socket with a Female 1/8-27 IPS we can use the NO325 Nozzle as an Adapter. Another way to Adapt Different Size Male Thread to Female Thread is by Using a  Reducing Coupling and a Nipple.
For Example: If we had a Male 1/2 NPT Pipe and we have a socket with a Female 1/4-18 IPS we can use the NE457 along with a 1/4-18 IPS Nipple.
[null, {"document_url": "https://grandbrass.zendesk.com/hc/en-us/articles/207350170-Lamp-Socket-Thread-Sizes", "unformatted_src": "/hc/en-us/article_attachments/203719444/NO325.jpg", "src": "https://grandbrass.zendesk.com/hc/en-us/article_attachments/203719444/NO325.jpg", "formatted_filename": "NO", "rendered_width": 173, "rendered_height": 173}, null, {"document_url": "https://grandbrass.zendesk.com/hc/en-us/articles/207350170-Lamp-Socket-Thread-Sizes", "unformatted_src": "/hc/en-us/article_attachments/203719564/ne457.jpg", "src": "https://grandbrass.zendesk.com/hc/en-us/article_attachments/203719564/ne457.jpg", "formatted_filename": "ne", "rendered_width": 198, "rendered_height": 198}, {"document_url": "https://grandbrass.zendesk.com/hc/en-us/articles/207350170-Lamp-Socket-Thread-Sizes", "unformatted_src": "/hc/en-us/article_attachments/203719584/14Nipple.jpg", "src": "https://grandbrass.zendesk.com/hc/en-us/article_attachments/203719584/14Nipple.jpg", "formatted_filename": "Nipple", "rendered_width": 193, "rendered_height": 196}, null]