A set screw is a type of screw generally used to secure an object within or against another object, normally not using a nut.The most common examples are securing a pulley or gear to a shaft.
#10-24 Zinc Plated Steel Coarse Thread Square Nuts 40PK. Square nuts are typically mated with square-headed bolts.Compared to standard hex nuts, square nuts have a greater surface in contact with the part being fastened, and therefore provide greater resistance to loosening (though also greater resistance to tightening).
Compared to standard hex nuts, square nuts have a greater surface in contact with the part being fastened, and therefore provide greater resistance to loosening (though also greater resistance to tightening). #10-24 Zinc Plated Steel Coarse Thread Square Nuts 40PK. Square nuts are typically mated with square-headed bolts.