Abstract: To hold the edges of a sheet metal blank during stamping or forming, such as stretch forming, a flange of the blank is clamped between faces of one of the dies and a binder which form a lockbead in the flange that restrains movement of the flange during the subsequent forming operation. A double V lockbead having three alternately angled sharp bends of near 90 degrees and one or two connecting bends totaling near 90 degrees provides improved locking performance, especially where the clamping surfaces of the die are sloped from horizontal. The legs or sides of the beads may have unequal lengths. The bend angles may be varied, in appropriate cases, within a reasonable range of from 75 to 120 degrees more or less as desired. Also, an additional angle or two, forming a third V could be used. The lockbead forming shapes are machined into the mating die and binder to form and retain the lockbead during the metal forming process.