The punch draws the metals into the die and squeezes the bottom of the drawn section. The moving die blades allow an outward flow of metal, expanding the diameter to form a strong circular lock. This mechanical process is highly consistent in production.

The moving die blades greatly reduce the force required to produce the joint as compared with fixed die styles. There is also no concern for joining oily metals, as oil can easily drain away without harming the die. The joined parts can easily be lifted from the die without requiring a die side stripper. A stripper is only required on the punch side.

Tog-L-Loc® Sheet Metal Joining System

• Joins plain, coated, and dissimilar metals. • No rivets, screws or other fasteners.

• Eliminates spot welding operations. • Long tool life; 250,000 joints common.

• Joins in a single press stroke. • Non destructive checking with a simple gage.

• Strong and highly fatigue resistant. • Leakproof joints. • No sparks, fumes or soot..