Electrical: Looking for best possible 20 amp latching style twist lock adapter set?

Anyone know about the name of and/or where I can find a kind of twist lock adapter set that holds together better than standard sets, for hanging from SJO cord like in a machine shop? So far all I can find are insulgrip special plugs with this plastic sleeve that latches. I thought there was a type out there that uses a metal latch mechanism to hold the adapters together... I hope someone here can help me out. These things keep taking abuse making them not work right anymore... I really need to find something that can hold up so I can stop paying to replace them (or duct taping them together- inspector doesn't like that)