Double-End Stud

A double-end stud is a headless fastener with threaded sections at both ends and an unthreaded shank between them. One end is installed in a tapped component and the other accepts a nut for machinery, flange, engine or fixture assembly. Buyers should specify thread at each end, engagement length, overall length, shank diameter, material grade, property class and finish. Safety and load values must come from the selected product standard, approval, drawing or test report; they cannot be inferred from appearance or nominal size. The RFQ should also state quantity, packaging, inspection and traceability requirements. This product is a component used in fabricated metal product manufacturing. It is typically made from carbon steel, alloy steel, or stainless steel, but the exact material grade must be confirmed against the product standard or drawing. The applicable standard listed is DIN 939 (catalog designation), which serves as a procurement reference; it does not certify compliance. The nominal size and range must be specified according to the drawing or selected standard, including both thread lengths and overall length. Strength and performance depend on the property class and engagement, which must match the joint design. Surface finish options include plain, zinc-plated, black oxide, or a specified coating. Always verify all values with the legal manufacturer or supplier before use.

The installed end anchors in the tapped body while nut tightening on the opposite end produces axial clamp load. The unthreaded shank provides a precise grip length and helps align the components. The clamp load holds the joint together, and the stud can be removed by unscrewing the nut and then the stud itself. Proper torque must be applied to achieve the required preload without exceeding the material's yield strength. The engagement length at the installed end must be sufficient to prevent thread stripping. The shank diameter is typically equal to the nominal thread diameter or slightly smaller, but this must be confirmed. The working principle relies on the friction between threads and the tension in the stud to maintain joint integrity.