Upon its circumference is a Knurled or milled nut C, which is threaded internally to receive the threaded wings of the bush B. A collar behind C holds it in place upon the hub.
"Modern Machine-Shop Practice, Volumes I and II"
Joshua Rose
Brodeur turned a Knurled disk, and from one of the boxes on the grass a sudden, whining hum arose, like millions of angry hornets.
"The Flying Legion"
George Allan England