Mudge Fasteners offers a large variety of available plating & finish options to meet the needs of the various industries we serve. If you require a plating or finish that is not listed below, please contact us. Please note that some plating & finishing can require a lead time. For more information on plating, finishing, or to request a quote, please contact us.
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.
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.
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.
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.
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.
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.
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.
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.
Electro-Zinc & Clear
One of the most popular commercial platings, Zinc is relatively economical and offers good corrosion resistance in environments not subject to excessive moisture. A clear chromate finish is applied on top of the Zinc to provide additional protection against white oxidation spots which can form due to moisture. Electroplating is the most common way of applying Zinc coatings to fasteners.
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.
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.
Electro-Zinc & Wax
A wax lubricant is added to the zinc coatings of certain fasteners to improve the ease of assembly. This is the standard coating for thread rolling screws and two-way reversible center-lock nuts.
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.
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.
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.
Mechanical Zinc & Clear
Mechanically applying zinc to fasteners reduces the risk of hydrogen embrittlement forming within the parts. This minimizes the need for the precautionary practice of baking the parts soon after plating. A clear chromate finish is applied on top of the zinc to provide additional protection against white oxidation spots, which can form due to moisture. It is common for lock washers made from spring steel to be plated this way to avoid brittleness after baking.
Mechanical Zinc & Yellow
This finish is identical to mechanical zinc, but with a yellow chromate finish. This is the standard plating for high-alloy split lock washers and for tooth lock washers used with zinc yellow machine screws.
Nickel has more of a silver color to it than zinc, and has similar corrosion resistant characteristics. It is the standard finish of cap nuts and countersunk finishing washers.
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.
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.