Stemlock®

The Stemlock is an advanced structural fastening solution that has among the highest shear and tensile values available because the mandrel is locked in the shear plane. The internal locking mechanism insures positive mandrel retention and will break flush with the head. The Stemlock is designed to form a bearing surface flange at the rear side of the substrate. This rear flange is perfect for thin sheets or imperfect holes offering impressive clamp up forces without deforming the substrate.