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DURA-CON Corrosion Resistant Fasteners have superior corrosion resistance to stand up to tough outdoor conditions. Nuts and washers are compatible with DURA-CON or stainless steel or zinc plated bolts. DURA-CON Galvanic Barrier Topcoat prevents corrosion caused by contact of dissimilar metals. No need to worry about your assembly weakening over time. Non-stainless steel means no thread galling (seizing), which can stop production. DURA-CON(R) Corrosion Resistant Fasteners cost less than stainless steel and are superior in many ways. The coating used on DURA-CON Fasteners cures to a surface with microscopic peaks and valleys. There interference created by those variations makes the nuts hard to turn by hand. Using tools, the nut travels smoothly and provides predictable torque-tension relationships due to lower co-efficient of friction than zinc plated, galvanized or stainless steel fasteners.