Coated Fasteners – Advanced Surface Protection for Critical Environments
Category: Coated Fasteners
Types: Bolts, Nuts, Washers, Screws, Threaded Rods, Custom Parts
Standards: DIN, ISO, ASTM, BS, JIS (based on fastener type)
Coating Technologies: Zinc Plated, Hot-Dip Galvanized (HDG), Dacromet, Geomet, Xylan, PTFE, Black Oxide, Nickel-Chrome, Ceramic Coating
Materials: Carbon Steel, Alloy Steel, Stainless Steel (A2/A4), Brass
Product Introduction
SM Fastners specializes in supplying corrosion-resistant, coated fasteners designed for marine, industrial, automotive, energy, and infrastructure projects. These fasteners undergo various surface treatment processes that provide long-term resistance against moisture, chemicals, salt spray, and atmospheric oxidation.
From zinc-coated structural bolts used in bridges, to Xylan-coated B7 studs for refineries, and HDG anchor rods for solar plants, we deliver high-performance fasteners with uniform, certified coatings and high adhesion.
Each batch is quality tested for coating thickness, adhesion, and corrosion hours to meet international specifications like ASTM B117, ISO 9227, and DIN 50979.
Types of Coating Available
We offer a range of surface finishes based on application, exposure, and aesthetic needs:
🔹 Zinc Electroplated (White / Blue / Yellow)
- Economical corrosion protection
- Used in indoor or mild outdoor environments
- Coating Thickness: 5–12 µm
- Passivated (trivalent or hex-free)
🔹 Hot-Dip Galvanized (HDG)
- Heavy-duty outdoor protection
- Ideal for steel structures, solar plants, bridges
- Coating Thickness: 45–85 µm
- Conforms to ASTM A153 / ISO 1461
🔹 Dacromet / Geomet
- Water-based, non-electrolytic zinc-aluminum coating
- Superior salt spray resistance (>1000 hrs)
- Used in automotive and wind turbines
- Friction-stable and non-hydrogen embrittling
🔹 Xylan / PTFE / Fluoropolymer Coated
- Chemically inert and low-friction coatings
- Ideal for oil & gas, chemical reactors, high-temp conditions
- Withstands -250°C to 200°C
- Excellent anti-seize and UV resistance
🔹 Black Oxide
- Aesthetic matte finish
- Mild corrosion resistance
- Used in tools, jigs, and indoor fittings
🔹 Nickel / Chrome / Ceramic Coatings
- Premium decorative or wear-resistant coating
- Used in high-heat or abrasion-prone applications
Applications
Coated fasteners are used where corrosion, temperature, or aesthetic needs demand specialized finishing. Our coated parts are engineered to extend service life, improve torque-tension consistency, and reduce maintenance cycles.
- Solar & Renewable Energy – HDG bolts and nuts for panel mounting, wind turbine base frames, and field structures.
- Oil & Gas / Petrochemical – Xylan/Dacromet coated studs and washers used in heat exchangers, pipelines, and refinery flanges.
- Marine & Offshore – Zinc-coated or ceramic-coated fasteners used in docks, ships, and seawater equipment.
- Automotive & Heavy Vehicles – Dacromet-treated bolts and clips used in chassis, engine compartments, and braking systems.
- Construction & Infrastructure – Hot-Dip Galvanized anchor rods and structural bolts for bridges, towers, and substation equipment.
- Chemical & Pharmaceutical Plants – PTFE and Geomet fasteners for tanks, reactors, pumps, and high-temperature environments.
Technical Overview
Why Choose SM Fastners?
🧪 Coating done by certified ISO/ASTM-approved vendors
🧰 In-house dimensional & coating thickness inspection
🌐 Global export capability with full batch traceability
📦 Torque-tension & coating test reports provided
🛡️ Salt spray test results available for every coating type
🔁 Compatible with nuts, washers, and accessories
Packaging & Delivery
We take extra care with coated fasteners to prevent damage or delamination:
- Polybag + moisture barrier wrap
- Coated parts packed in oil-paper or VCI paper
- Box-in-box or plastic drums for small parts
- Fumigated wooden crates or pallets for export
- Marking and color tagging per coating type
Industries We Serve
☀️ Solar & Renewable Energy
🛢️ Oil & Gas Refineries
⚙️ Heavy Industrial Equipment
🛳️ Marine & Shipbuilding
🏗️ Structural Engineering & Bridges
🚘 Automotive Assembly
🔬 Pharma & Chemical Industries
🔧 Tooling & Maintenance Kits
Documentation Supplied
- Material Test Certificate (EN 10204 3.1)
- Coating Thickness Certificate
- Salt Spray Test Report (Optional)
- Compliance: RoHS / REACH / DFARS / ISO
- Packing List, Export Invoice, and HS Code Declaration
- Coating Manufacturer’s Certification (on request)
Request a Quotation
We supply coated fasteners in bulk, kits, and project-specific lots. Need corrosion hours, coating specs, or torque performance?
📧 Email: susheel@smfastners.com
📞 Phone: +91 8968469570
💬 WhatsApp Chat: Click to Chat
Tell us your coating requirement and get a quote with price, coating process, packing method, and lead time.