Great connectors for phone lines - may not work well at all for motors, too much current.

Seriously, any connector has a rated current and voltage. From a number of tests we conducted when we we're HEAVY into electric R/C car racing, for low current appllications, almost any connector will suffice.

However, when you start to pull decent current (say more than an amp or so) or you have a connector that will encounter NUMEROUS make/break insertions, connector integrity starts to become a CRITICAL factor.

Basically, you can (and some people will) kluge up ANYTHING to make it work. However, if you want something to NOT have problems and NOT have durability issues, spring for the best connectors that you can hardly afford. If you want fool proof connectors, use the die cast MIL Spec pieces.

When these are used, the machine simply runs and goofy a$$ connector issues are GONE for good. Pricey? Yes. Lacking the dollars for these? Consider the used of WeatherPak connectors made by Packard Electric/Delco.

These automotive grade connectors come in various size and current ratings that do a good job of making and maintaining vibration and environmentally resistant electrical connections in extreme operating environments. THe environment of an underhood application is EASILY more severe than many/most CNC applications.

PS: don't buy the pigtails and then start splicing. Buy the proper wire and the proper terminals and crimping tool and do the job right, from terminal to terminal. By doing so, you will NOT become disappointed.

As far as shielded connectors go, the MIL spec stuff is still the way to go as this system maintails R/F shielding to/through the connector which the WeatherPak stuff doesn't.