Cooper S42 Universal Angle Plug 

Welding machine and single phase 220V equipment plug

• Commercial grade power plug with blades for 30 or 50 amp applications.
• 3-Pole, 3-Wire Dual current model rated up to 250V
• Terminals have pressure plates to protect wires.
• Made from abuse resistant thermoplastic.
• NEMA 6-50/6-30

 Cooper 1252 Power Outlet 250V 50A NEMA 6-50R