Lock Nuts

Half Lock Nuts

Half lock nuts, also known as jam nuts or thin nuts, are low-profile threaded fasteners characterized by a reduced height of approximately half that of standard hex nuts. They are engineered to operate in tandem with a full-height nut; when tightened against each other, the opposing thread forces create a mechanical jam that prevents rotational loosening under continuous vibration. Manufactured to standards like DIN 439 or ASME B18.2.2, these fasteners are crucial for space-constrained mechanical assemblies, automotive wheel components, and dynamic heavy machinery where standard lock washers are insufficient.