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Only manufacturer with precision honed bores on straight bore rigid couplings for superior fit and torque transmission and alignment. Ruland rigid couplings do not introduce misalignment, vibration, or bearing noise into the system making them suitable for high precision servo applications and shaft to shaft connections. Highest grade forged screws test beyond industry standards for maximum torque ability. In-house proprietary black oxide process produces a fine glossy finish while increasing holding power and resisting corrosion. All rigid couplings are manufactured from bar stock in our Marlborough, MA factory under strict controls using proprietary processes.