Price Ranges for Bolts and Nuts, Black Steel, Countersunk Head with Round Shaft and Hexagonal Nut

The prices of bolts and nuts can vary based on factors such as material, size, quantity, and manufacturer. As of my last available information, for black steel countersunk head bolts with a hexagonal nut, the price can range from around $0.10 to $1 per piece for standard sizes. However, prices may fluctuate due to market conditions, so it's advisable to contact suppliers or check online marketplaces for current pricing information.