U.S. Pat. 3,356,821

You can spot or projection weld in half the time by doubling the number of welds per machine stroke. Use Teeter-Tip dual tip adapters, which come with watercoolant fittings to beat high heat build-up. These, adapters transmit total pressures of 1000 lbs., and deliver equal current and pressure to each tip. They compensate for normal electrode wear, imperfect tip dressing, and work variations up to .060”.

LIGHT-DUTY adapters have no. 4 or 5 RW shanks, tip spacing to 4 inches, tip sockets for 1/2” or 5/8” diameter male Tuffcap caps, or 4 RW tips (5/8” cap sockets are standard).

HEAVY-DUTY adapters have shanks from 5 to 7 RW size, tip spacing to 6 inches, tip sockets for 1/2” or 5/8”’ diameter male Tuffcap caps, or 4 or 5 RW tips (4 RW sockets are standard). These adapters have a deeper, stronger body.