Fold size = width of the lock - 2 times the material thickness

Fold size = width of the lock - 3 times the material thickness

Fold size = width of the lock - 4 times the material thickness

Fold size = width of the lock - 5 times the material thickness

Stake joint

Standing seam

Locked groove joint

Pittsburgh lock

Two

Three

Four

Five

2 to 3 times

3 to 4 times

4 to 5 times

5 to 6 times

Wiring

Turning

Hemming

Stiffening