Spieth MSR40-1 (MSR40 series) is a precision locknut engineered for industrial shaft locking and positioning applications. Designed with a 40mm internal diameter, it features a self-centering, backlash-free design that ensures high concentricity and repeatable positioning accuracy (≤0.01mm runout).Constructed from high-strength alloy steel with corrosion-resistant surface treatment, the locknut incorporates a dual locking mechanism (radial clamping + axial compression) to prevent loosening under vibration and dynamic loads. It supports quick, tool-free installation via set screws and is compatible with standard metric shafts, requiring no special machining.