Metal Bolts and Studs

Shoulder Bolts

Shoulder bolts integrate a precision-ground, unthreaded cylindrical shaft between the head and the threaded section to act as a linear guide or rotational pivot. The shoulder is machined to tight dimensional tolerances, allowing it to function as a highly accurate bearing surface for pulleys, gears, and linkages. Because the wider shoulder bears the primary lateral loads, these fasteners significantly reduce stress concentrations on the threaded segment. They are essential components in die-stamping assemblies, automotive suspension linkages, and complex sliding mechanisms.