The material selection of sprocket bolts mainly depends on three core factors: application scenario, load strength, and corrosion level of the working environment. Common materials and their applicable scenarios are as follows:

This is the most basic and cost-effective option. After quenching and tempering treatment, 45# carbon steel has sufficient strength and hardness to meet the requirements of light-load, non-corrosive working conditions, such as small conveyors and light-duty sprocket transmission equipment. The disadvantage is its poor corrosion resistance; it tends to rust when used in humid or outdoor environments for a long time. Therefore, surface treatments like galvanizing or blackening are usually required to enhance its rust-proof performance.