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Last updated: January 2026
This directory lists 52 black oxide coating companies across the United States, from high-volume industrial finishers supporting continuous production lines to specialized precision coaters focusing on aerospace and medical-grade components.
Buyers in this space are typically solving problems related to achieving specific aesthetic requirements, enhancing lubricity, providing mild corrosion resistance, or preparing surfaces for subsequent coatings without significant dimensional change. Key technical considerations include ensuring the black oxide finish meets specific MIL-DTL-13924 classifications, guaranteeing consistent penetrant retention for non-destructive testing, and mitigating the risk of hydrogen embrittlement in high-strength steel alloys.
Suppliers in this category vary significantly, encompassing large integrated finishing houses offering a spectrum of services, dedicated black oxide job shops, and even smaller, highly specialized operations focusing on particular substrates like stainless steel or specific component types. Distinctions often lie in their processing capabilities (e.g., automated vs. manual lines, bath size, ability to handle unique part geometries), their in-house quality control and testing facilities, and their certifications, such as AS9100 for aerospace or ISO 13485 for medical devices.
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52 companies nationwide
Based in Cleveland, OH, Abel Metal Processing Inc. specializes in black oxide and industrial finishing services. They provide protective finishes for steel, stainless steel, aluminum, copper, and bronze, enhancing durability and corrosion resistance. Their capabilities include passivation, pickling, and oiling for various industrial components.
Based in Waltham, MA, Acton Metal Processing Corp. is a specialty metal finishing job shop providing black coatings on metal. They offer barrel, basket, and rack processing for ferrous metals, copper, brass, bronze, and stainless steel. The company is ISO 9001:2015 certified and utilizes advanced wastewater treatment systems.
Based in Seabrook, NH, AeroDynamics Metal Finishing is a NADCAP-approved, full-service electroplating company. They provide black oxide and various metal finishing services from their 40,000 sq ft facility. Since 1989, the company has specialized in the aerospace, military, defense, commercial, industrial, and medical industries, offering high-quality products.
Based in Mansfield, TX, Automated Finishing Technology is an ISO 9001:2015 certified provider of metal finishing and electroplating services. Since 1984, they offer black oxide, Xylan, silver, zinc nickel, and phosphate coatings. They serve manufacturers, notably the oil field industry, throughout Texas, Oklahoma, and Arkansas.
AOTCO Metal Finishing specializes in black oxide finishes, providing solutions for corrosion resistance and aesthetic appeal. The company ensures quality results, meeting MIL C 13924 specifications. Based in Billerica, MA, AOTCO offers expert metal finishing services for industrial applications.
Based in Milwaukee, WI, Barrel Plating Service, Inc. provides metal finishing services, specializing in Black Oxide, Zinc Phosphate, and Rubber to Metal Adhesive Coatings. Serving the lawn and garden, agriculture, medical, and automotive industries since 1955, they operate a 50,000 sq ft facility with automated and manual lines.
Based in Eden Prairie, MN, Birchwood Technologies provides specialized metal finishing solutions. Their in-house services include mid-temperature Tru Temp Black Oxide and room-temperature Presto Black finishes for all steels, stainless steel, and cast iron. They also offer zinc phosphate, antiquing, and rust preventives.
Based in Anaheim, CA, Black Oxide Industries specializes in chemical conversion coatings, specifically black oxide, and metal finishing services. Established in 1974, it operates one of the largest facilities in the United States. The Nadcap-accredited company serves the US military, defense, aerospace industries, and commercial customers.
Based in Brooklyn, OH, Cleveland Black Oxide specializes in providing black oxide coating services. This chemical conversion coating process is applied to various substrates, offering durable finishing solutions for industrial components and parts.
Based in Houston, TX, Diamond Metal Finishing provides a wide range of metal finishing services, including black oxide coating. The company offers various plating, anodizing, and chemical film solutions for industries such as oil & gas, aerospace, medical, and automotive.
Based in Fridley, MN, Ecofinishing provides diverse metal finishing services, including black oxide coating, anodizing, chromate conversion, and various plating options like copper, electrolytic, and electroless nickel. They also offer passivation, phosphate coatings, and zinc plating, supporting custom industrial finishing needs.
Finishing Technology, based in Evendale, OH, specializes in black oxide coating services. The company utilizes a hot black solution, with tanks operational at approximately 285ºF, heated by a 1.2 million BTU system. They provide cost-effective solutions for diverse mass finishing needs.
Hale Performance Coatings, Inc. based in Toledo, OH, specializes in industrial finishing services. They provide black oxide coatings for steel, stainless steel, and copper alloys, alongside phosphating, rust preventative, and custom coating solutions. The company handles high-volume orders for diverse industrial and commercial parts.
Har-Conn Aerospace, headquartered in South Windsor, CT, specializes in providing black oxide coating services for the aerospace and defense industries. They offer a comprehensive range of surface finishing processes, including anodizing, chemical films, and various plating solutions, from multiple US facilities.
Based in Dayton, OH, Hohman Plating, LLC provides specialized metal finishing and plating services. The company offers a range of surface treatment processes, including black oxide coating, for industrial and commercial applications across various manufacturing sectors.
Based in South Houston, TX, Houston Plating & Coatings LLC specializes in high-quality black oxide coatings for various metal substrates. The company provides enhanced corrosion resistance, reduced light reflection, and improved wear properties, meeting demanding specifications like MIL-DTL-13924 and AMS 2481.
Based in Houston, TX, Industrial Metal Finishing provides black oxide along with comprehensive metal finishing services like anodizing, phosphating, and chromate conversion. They also offer electroplating and specialized spray coatings. Serving diverse industries such as petrochemical, aerospace, military, and fastener manufacturers.
InterCorpUSA specializes in providing conversion coatings, including black oxide, designed to enhance mild corrosion resistance and improve the aesthetic appearance of components. This process is utilized across various industrial sectors seeking durable surface treatments. The company operates its own facilities to deliver these specialized coating services.
Momentum Metal Finishing, based in Sunnyvale, CA, offers comprehensive metal finishing services. They specialize in surface treatments for industrial components, providing solutions like black oxide coating to enhance durability and appearance for their commercial clientele.
Based in Los Angeles, CA, Pentrate Metal Processing, Inc. specializes in comprehensive metal finishing services. They directly provide black oxide coating for machined parts, tool components, and firearm components. Additional plating and coating services cover stamped parts, fasteners, die cast zinc, musical instruments, and aluminum, catering to diverse industrial applications.
Phoenix Metal Finishing Inc. based in Santa Fe Springs, CA, provides comprehensive metal finishing services. They specialize in black oxide coatings for ferrous, stainless steel, and copper alloys, offering hot and room temperature processes. Serving diverse industrial sectors, their coatings enhance aesthetics and corrosion resistance.
Quick Turn Anodizing, LLC specializes in metal finishing services, including Black Oxide Coating of Steel, Type II and Type III Anodizing, Chromate Conversion Coatings (CHEM FILM), and Stainless Steel Passivation. The ITAR Registered company is an approved supplier to RAYTHEON, providing services with a 3-day average turnaround.
R.C. Industries Inc. is a Chicago, IL-based metal finishing specialist providing barrel and rack plating services. They offer black oxide coatings for stainless steel, brass, and copper alloys. Other services include zinc phosphate, nickel, tin and alloy, and gold plating for diverse metallic substrates.
Rie Coatings provides engineered coatings, platings, and surface treatments, offering comprehensive part finishing solutions tailored for lasting performance. They apply certified solutions from brands like Magni®, Doerken®, and Sandstrom®, serving diverse industrial sectors including aerospace, agriculture, automotive, heavy equipment, and military.
Based in Dayton, OH, Rite-Way Black & Deburr is a family-owned and operated metal finishing company. They specialize in black oxide coatings, providing Class II alkaline oxidizing processes for corrosion-resistant steel alloys. With over 40 years of experience, the company also offers deburring services.
Based in Orange, CA, Sav-On Plating provides comprehensive industrial metal finishing services. They specialize in black oxide coating for stainless steel and mild steel, offering chemical immersion coatings designed to enhance corrosion resistance when used with oil or wax.
Based in Santa Clara, CA, Scientific Metal Finishing Inc. provides specialized metal finishing solutions. As a dedicated provider, the company likely offers various industrial surface treatments, including processes such as black oxide coatings, for commercial and industrial components, enhancing durability and appearance for clients.
SMFI specializes in providing expert black oxide coating services for both steel and stainless steel components. Their processes are designed to enhance corrosion resistance and improve the aesthetic finish, particularly for precision parts. Based in Altamonte Springs, Florida, SMFI serves industrial and commercial clients requiring specialized surface treatments.
Based in Fort Worth, TX, Southwest Metal Treating Corp provides metal treatment services with over 40 years of experience. They cater to industrial clients across cutlery, hand tool, industrial machinery, and turbine and turbine generator manufacturing, offering solutions to improve component performance.
Based in Cleveland, OH, Standby Black Oxide Products provides fully automated black oxide coating services. Established in 2023, this family-owned company leverages technically advanced equipment. They deliver consistent, high-quality results for customer parts from their US facilities, adhering to industry standards.
Surface Coatings LLC provides commercial metal plating and finishing services, including electroless nickel, tin, zinc, chrome, and black oxide coatings. They handle precision machined parts and larger components up to 10 feet, emphasizing high-quality finishes, quick turnaround, and responsive customer service.
Based in New Berlin, WI, UNICO of New Berlin specializes in black oxide finishing services. The company caters to a diverse range of industrial clients, including midwestern manufacturing facilities, tool & die shops, and businesses in the automotive and stamping sectors, providing reliable coating solutions.
Based in Gastonia, NC, Universal Black Oxide provides black oxide coating and passivation services. With 40 years of experience, the company specializes in high-quality finishes, processing over 20 million parts annually for various industries.
Based in Pontiac, MI, Detroit Steel Treating provides hot black oxiding and reliable heat treating services. With nearly a century of expertise, they process critical parts to required specifications, ensuring dependable quality. The company is registered to ISO 9001:2015.
Based in Cleveland, TN, Fowler Industrial Plating Inc. is a metal finishing company specializing in black oxide coating. They apply black oxide to iron, steel, and stainless steel components, enhancing their performance. Other services include electroless nickel, hard gold plating, passivation, and Teflon coatings for various industrial applications.
Based in Gardena, CA, Custom Metal Finishing Inc. specializes in comprehensive metal finishing services. They provide a wide range of processes including vibratory finishing, deburring, parts cleaning, and wet blasting. Crucially for this directory, the company directly offers black oxide coating services, catering to diverse industrial applications.
Based in Syracuse, NY, Anoplate Corporation is an industrial metal finishing company specializing in conversion coatings. They provide black oxide services, which offer metals a matte black finish and improve dimensional stability. Anoplate has been serving various industries with their coating expertise since 1960.
Based in Garrettsville, OH, Black Boar Armory & Coatings specializes in surface finishing. The company directly provides hot bluing, a form of black oxide coating, alongside Cerakote, Duracoat, and HydroGraphic services. They apply durable finishes to firearms and various metal components, also offering gunsmithing and custom slide milling.
By Design Black Oxide and Tool, LLC provides black oxide conversion coating services for commercial and individual needs. With over 25 years of experience, the company operates an 11,000 sq ft facility, specializing in custom racks for intricate parts. They serve diverse industries including sporting arms, automotive, robotics, and electronics.
Based in Oceanside, CA, Elite Metal Finishing provides a comprehensive array of precision metal finishing services. Their capabilities include anodizing (Type II & III), chromate conversion, passivation, electropolishing, and dry film lubricants. The company specializes in offering direct black oxide coating solutions for diverse industrial and commercial applications.
Gleco Plating Inc. is a full-service metal finishing and coating company based in Rowlett, TX. Specializing in industrial applications, they provide high-quality black oxide coating, zinc plating, electroless nickel plating, passivation, and other metal finishing solutions. They serve various industries with custom solutions.
Based in Orange, CA, Magma Finishing Corp. - Gunsmithing Division specializes in firearm metal surface transformation. They provide services including bluing (black oxide), Cerakote, electroplating, and Parkerizing. Working with steel, aluminum, and brass, this licensed gunsmith enterprise offers professional finishing expertise with in-house capabilities.
Based in Sanford, ME, Legu Tool and Mold, LLC specializes in small batch black oxide plating services. They enhance durability, corrosion resistance, and aesthetic appeal for precision-machined components. The company also provides comprehensive precision machining capabilities, including Wire EDM, turning, milling, grinding, and CNC machining.
Based in Lancaster, OH, Ohio Oxide Corporation specializes in high-quality black oxide coating services for ferrous metals. As an experienced job shop established in 1999, they offer rapid turnaround times and adhere to military specifications, serving industrial clients with precision and efficiency.
Parker Trutec provides industrial metal finishing and heat treatment services, specializing in Black Oxide coatings for ferrous materials, stainless steel, and copper alloys. The company also offers ISONITE® Salt Bath Nitriding, gas carburizing, and various vibratory and shot blasting finishes across multiple US facilities.
Based in Santa Clara, CA, Santa Clara Plating Co. Inc. specializes in metal finishing services. They offer black oxide coatings for steel, stainless steel, copper, and copper alloys, alongside anodizing, electroless nickel, and passivation. Certified ISO 9001:2015, they serve industrial clients across Silicon Valley.
S&P Heat Treating, Inc. offers metal treatment services, specializing in black oxide coating for a uniform black surface. They expertly handle single piece, small batch, and bulk orders. With 30 years of experience and ISO 9001:2015 certification, they serve demanding industrial clients including Navy, Ford, GM, and Nuclear.
Based in Garland, TX, Texas Precision Plating, Inc. is a family-owned company operating since 1966. They offer a wide range of plating services including Black Oxide coating, zinc, anodize, and chem-film. The company serves commercial, automotive, electronics, aerospace, military, and government specifications.
Based in Huntsville, AL, United Plating, Inc. provides comprehensive metal finishing services, including industrial painting, plating, anodizing, and chem film. The company holds NADCAP, AC7004, and ITAR certifications, serving demanding sectors like automotive, aerospace, military, medical, and industrial.
Based in Seattle, WA, BLACKENED metal finishing is a specialty metal finishing shop offering services for custom shops, contractors, and designers nationwide. They specialize in finishes for mild steel, including what is specified as ‘blackened steel,’ alongside blackened stainless steel, copper, brass, and bronze, and other specialty metals.
Metal Finishing Technology is a US-based provider of black oxide conversion coatings. With over 20 years of experience, the company offers specialized black oxide services for industrial clients, capable of coating parts up to 8 feet in length and 3 feet in width.
Based in Houston, TX, Specialty Metal Finishing, Inc. is a direct provider of diverse metal finishing services. The company specializes in black oxide coating for ferrous materials, offering mild corrosion resistance and a decorative finish. They also provide plating, anodizing, electropolishing, passivation, powder coating, and painting solutions for various industrial applications.
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Hot black oxide, a conversion coating, offers superior abrasion resistance and excellent adhesion for subsequent rust preventative oils, providing greater corrosion protection and durability, particularly for critical applications on ferrous metals requiring MIL-DTL-13924. Cold black oxide, an acidic finish, is typically a surface darkening agent that provides minimal corrosion resistance on its own and is less durable; it's generally chosen for aesthetic purposes or when dimensional stability is paramount, as it's applied at room temperature and doesn't involve the same caustic process as hot black oxide. Choose hot black oxide for functional corrosion resistance, high wear, or military specifications; opt for cold black oxide when temperature sensitivity, ultra-tight tolerances, or cost for non-critical parts are primary concerns.
Preventing hydrogen embrittlement in high-strength steels (typically those with a tensile strength of 160,000 psi or greater) requires a post-coating bake-out. Ensure your black oxide coater follows specifications like MIL-DTL-13924 or ASTM F1940, which mandate baking within a specified timeframe (e.g., 1-4 hours) after the coating process for a specific duration (e.g., 3-24 hours) at a precise temperature (e.g., 375-400°F). It's crucial to confirm the coater has calibrated ovens, precise temperature controls, and provides certification for this baking process, as omitting or improperly executing it can lead to catastrophic part failure under stress.
Black oxide itself offers minimal corrosion resistance; its protective qualities are primarily derived from the post-treatment. Common options include water-displacing oils (offering good corrosion protection and some lubricity), dry-to-touch oils (less messy, good protection), waxes (excellent for humid environments, moderate lubricity), and lacquers or sealers (providing a more durable finish, good protection, but can affect appearance and lubricity). The choice depends on your application's environment, handling requirements, and whether you need added lubricity, requiring careful discussion with your supplier about their specific product offerings and performance data.
While black oxide is generally considered to add negligible thickness, it can still impact extremely tight tolerances. Hot black oxide typically forms a coating of 0.000020 to 0.000030 inches (0.5 to 0.8 microns). Cold black oxide coatings are even thinner. For parts with critical dimensions, it’s essential to provide your coater with your part's tolerance stack-up and critical dimensions. A reputable supplier will understand these concerns and may offer methods to measure and verify minimal dimensional impact, or advise on part design adjustments for extremely sensitive features.
Ensuring consistent color and finish across batches requires stringent process control. Key factors include maintaining precise bath chemistry (pH, concentration of oxidizers), consistent bath temperature, uniform immersion times, and thorough pre-treatment (cleaning, descaling) for every part. Suppliers achieve this through regular chemical analysis of their baths, automated temperature controls, standardized racking procedures to prevent shadowing, and visual inspection by trained personnel. Ask about their Statistical Process Control (SPC) data for bath parameters and their quality inspection protocols for visual consistency.
Beyond visual inspection for uniform black finish, expect your coater to perform tests relevant to your application. For corrosion resistance, common tests include salt spray (ASTM B117) or humidity chamber testing on sample parts. Adhesion can be checked with tape tests (ASTM D3359) or rub tests. For high-strength steels, hydrogen embrittlement verification (e.g., sustained load testing if required by spec) is critical. Some suppliers may also perform film thickness measurements if required, though black oxide is typically too thin for conventional methods. Always discuss your specific functional requirements to ensure appropriate testing is performed and documented.