Hex Half Lock Nuts M33x1.5 10.9 MF PLN Spec

Hex half lock nuts (or jam/thin nuts) are low-profile, six-sided fasteners, typically half the height of a standard nut, designed to prevent loosening by jamming against a primary nut or in tight spaces. They conform to DIN 439 or ISO 4035 standards and are used in machinery, construction, and automotive applications.