Black Oxide finish on our Rigid Coupling is formulated as part of the total performance of the coupling. The black oxide affects the anti-stick-slip characteristics and helps keep the torque rating of the screw within its design parameters. The black oxide has corrosion resistant properties for indoor environmental applications. However, black oxide is not intended as an outside weather protective finish. Other advantages to a black oxide finish include dimensional uniformity with negligible thickness and no flaking or chipping.
Rigid Coupling Manufacturers offers other special finishes to meet required needs. Special finishes include anodizing on aluminum couplings and special zinc-plating with greater corrosion resistance.
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