Available Platings
Black Oxide
This is a "conversion coating", which means it is formed by a chemical reaction with the metal to form an integral surface, as opposed to an "applied coating" like zinc which bonds to the metal. An oil finish is applied as a rust inhibitor.
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Black Phosphate
This is the standard finish for most drywall screws, particle board screws and retaining rings. It can have either a dull or bright appearance. No additional oil treatment is required.
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Black Phosphate & Oil
The oil serves as a rust inhibitor and a lubricant. Floorboard screws, frame bolts. Grade-GT locknuts and spring nuts are usually supplied with a black phosphate and oil finish.
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Blue Ruspert
Ruspert metal finish is a high-quality corrosion-resistant coating that is comprised by three layers: 1) metallic zinc; 2) a chemical conversion film (to resist corrosion); 3) a ceramic surface coating that is baked.
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Cadmium & Wax
Cadium plating in a smoother surface and greater resistance to white oxidation spots than zinc plating. However, cadmium is a much more toxic metal than zinc, which makes the plating process more difficult and costly. A supplemental wax coating is often added as a lubricant when cadmium is used on prevailing torque lock nuts.
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Chrome
Chrome plating can be done in two ways: 1) A "hard chrome" finish deposits a thick layer of chrome on the part. This gives the fastener a very hard finish and superior wear resistance but does offer protection to corrosion; 2) A "nickel-chrome" finish is achieved by applying a flash of chrome on top of the nickel plating. This offers resistance to tarnishing and corrosion.
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Dacro
Dacro is a pollution-free ceramic coating for fasteners used with treated lumber. The coating offers corrosion protection comparable to hot-dip galvanizing without discoloring the wood. Screws with a proper dacro coating can typically withstand a 500-hour salt spray test. A dacro finish minimizes greatly the risk of hydrogen embrittlement so baking the part is not required after the finish is applied.
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DURA-CON®
DURA-CON® Corrosion Resistant Fasteners are the only fasteners specifically tested for use in solar racking materials. DURA-CON® Fasteners show resistance to Environmental Corrosion equal to that of stainless steel fasteners when tested in aluminum solar panel racking.
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Electro-Zinc & Black
Commercial zinc black plating offers comparable to slightly better corrosion resistance compared to zinc-clear. It offers significantly better corrosion-resistance compared to black oxide. It is also a smoother and more scratch-resistant finish than black oxide.
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Electro-Zinc & Clear
The most popular commercial platings, Zinc is both economical and corrosion resistant, commonly used in environments where excessive moisture will not be present. On top of the Zinc, a clear chromate finish is applied to create an additional layer of protection against white oxidation spots that can form in the presence of moisture. The most common way of applying Zinc coatings to fasteners is through electroplating.
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Electro-Zinc & Clear for Sockets
Socket cap screws can receive a zinc plating of 0.0002 inches thickness. A clear chromate finish is applied on top of the zinc to provide additional protection against white corrosion.
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Electro-Zinc & Green
Commercial zinc green is the finish applied to machine screws and thread-cutting screws that will be used as a grounding screw in electrical operations.
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Electro-Zinc & Wax
With this coating, wax lubricant is added to the zinc mix, increasing the ease of assembly in certain fasteners. This coating is standard for two-way reversible center-lock nuts and thread rolling screws (TRS).
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Electro-Zinc & Yellow
Similar to Clear Zinc plating, however a yellow chromate finish is used in lieu of a clear chromate finish. The yellow chromated finish offers a greater degree of protection from white corrosion than does clear chromate.
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Green Ceramic
Ceramic finish is also a barrier coating used to offer corrosion resistance. It is used, though not exclusively, on certain types of construction fasteners and typically provides over 500 salt spray hours of protection.
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Hot-Dip Galvanized
Hot dip galvanizing is generally the most effective way to apply a sufficient thickness of zinc to serve as a corrosion protectant in harsh environments. During the galvanizing process, steel reacts with molten zinc, forming layers of zinc-iron alloy, which are metallurgical bonded to the steel surface. This hard barrier has a low corrosion rate and resists mechanical damage.
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Mechanical Zinc & Clear
When zinc is mechanically applied to fasteners, the risk of hydrogen embrittlement forming within the parts is significantly reduced, thereby minimizing the need to bake the parts soon after plating as a precautionary measure. On top of the zinc, a clear chromate finish is applied for protection against white spots of oxidation, which can form when moisture is present. Lock washers made from spring steel are commonly plated this way to reduce the possibility of brittleness after the baking process.
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Mechanical Zinc & Yellow
Identical to mechanical zinc, but with the addition of a yellow chromate finish. High-alloy split lock washers and tooth lock washers come standard with this finish, especially when used in conjunction with zinc yellow machine screws.
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Nickel
Nickel’s appearance is more silver than zinc, but has a similar level of corrosion resistance. Cap nuts and countersunk finishing washers come standard with a nickel finish.
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Silver
Silver is excellent conductor of electricity. Its benefits are both decorative and protective as it resists thread galling when mated parts are under extreme pressure or exposed to extreme heat.
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Tin
Tin plating is sometimes used in the food handling industry & electronics industry. It resists organic acid, improves the lubricity of steel and offers a high degree of corrosion resistance.
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Xylan "Blue Bolt Coating"
Xylan is a blend of fluoropolymers, engineering plastics and selected corrosion inhibitors which, when combined, create these characteristics in fasteners such as low friction, exceptional adhesion, unusual resistance to wear and abrasion, excellent corrosion resistance, resistance to chipping and resistance to the weather, sunlight and salt water.
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