Black oxide finish on our steel couplings 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.

Zinc plating provides corrosion resistance in indoor environmental applications and has a “shiny silver” appearance for product appeal. Special zinc-plating, often associated with different colorings, such as yellow zinc or black zinc plating, can be applied to greatly increase corrosion resistance.

Climax offers other special finishes to meet required needs. Special finishes include anodizing on aluminum couplings and special zinc-plating with greater corrosion resistance. Contact customer service at 800-542-6552 for complete information on Climax’s special finishes.

Categories: Frequently Asked Questions, Rigid Couplings

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