A range of jackscrews for the M Series pin and socket connectors. These M Series jackscrews are available in turnable and fixed styles. The turnable jackscrews have a die cast zinc chromate conversion coating with a stainless steel tip. The Fixed jackscrews have a steel lockwasher and zinc plated steel hex nut. Jackscrews help to mate and unmate connectors and hold mated connectors together and can also be used for polarization. The turnable jackscrews rotate freely in the connector housing and are used opposite mating fixed jackscrews.