A female threaded standoff helps to position components in subassemblies where the separate components both have male threads. The hex profile allows the use of a wrench to tighten all components together.
Servo Magazine - March 2011, PDF, Electrical Connector
This 64 mm long standoff allows you to place two components 64 mm apart, or the width of four S3 Tubes, using 6-32 screws. Use it to space out two S3
5/16 in. Hex Female to Female 64 mm Long Standoff
10-32 Female Threaded 2 in. Hex Standoff - AndyMark, Inc
10-32 Threaded 2 in. Long 0.5 in. Dia. Hex Standoff - AndyMark, Inc
Hex Molded Spacers - AndyMark, Inc
AndyMark Studica Canada - Robotics, Automation Technology for
10-32 Female Nylon Rod End - AndyMark, Inc
AndyMark Studica Canada - Robotics, Automation Technology for
Blue Sport Gearbox 1/2 in. Hex Female Output Adapter Shaft
10-32 Female Nylon Rod End - AndyMark, Inc