42CrMo4 Alloy Steel Dacro Coated Shoulder Bolt

Shoulder bolts are manufactured from carbon steel or alloy steel, providing high tensile strength and wear resistance. The alloy steel variants, such as SCM435 or 42CrMo4, offer enhanced durability for heavy-duty industrial applications. Dimensions are fully customizable, including shoulder diameter, shoulder length, thread size, and overall length, allowing a precise fit for specific pivot or sliding mechanisms.

Several international standards govern shoulder bolt specifications. The primary standard for metric hexagon socket head shoulder screws is ISO 7379, which covers nominal shoulder diameters from 6.5 mm to 25 mm with f9 tolerance class. For inch-series shoulder bolts, ASME B18.3 (Socket Cap, Shoulder, and Set Screws) applies. Additional standards include DIN 927 for slotted shoulder screws with thread sizes M1 to M6 and DIN 9841 for metric shoulder bolts
Available surface treatments include black oxide, zinc plating, galvanization, phosphate coating, and Dacro finish, all of which enhance corrosion resistance and extend service life.