Realbolt Engineering Industries is a trusted manufacturer and supplier of coated fasteners engineered for enhanced durability and performance in extreme environments. Our coated fasteners offer superior resistance to corrosion, wear, and chemical exposure, making them ideal for demanding applications in industries such as Offshore, Petrochemical, Automotive, Marine, and Infrastructure.
By combining precision manufacturing with advanced surface treatments, our coated fasteners are designed to ensure long-term reliability, reduce maintenance costs, and extend service life even under harsh operating conditions. We offer a wide range of coating options to meet specific performance and environmental requirements.
Our coated fasteners are available in a variety of materials, thread types, and coating combinations, tailored to meet international standards and application-specific needs.
| Specification | Details |
|---|---|
| Standards | ASTM A193, ASTM A320, ISO 898-1, DIN 267-10, ASME B18.2.1 |
| Sizes | M4 to M100 | 1/8" to 4" (Custom sizes available on request) |
| Types | Bolts, Nuts, Washers, Screws, Studs, Anchors, U-Bolts, Threaded Rods |
| Materials | Carbon Steel, Stainless Steel, Alloy Steel, Brass, Copper, Duplex, Inconel, Titanium |
| Coating Options | Hot-Dip Galvanized (HDG), Zinc Flake, Xylan®, PTFE, Dacromet®, Geomet®, Epoxy Coating, Nickel Plated |
| Corrosion Resistance | Standard to Extreme | Up to 1000+ hours salt spray resistance (as per ASTM B117) |
| Certifications | EN 10204 3.1 / 3.2, NACE MR0175/ISO 15156, RoHS Compliance, Third-party Inspection Available |
PTFE (Polytetrafluoroethylene) Coated Fasteners are engineered to provide superior performance in aggressive environments. This non-stick fluoropolymer coating offers exceptional resistance to high temperatures, chemicals, and corrosion, along with a very low coefficient of friction. With excellent release properties and minimal moisture absorption, PTFE coatings are ideal for challenging industrial conditions.
Commonly used in Oil & Gas, Marine, Offshore, and Petrochemical sectors, PTFE coated fasteners offer outstanding resistance to salt spray and extreme environmental stress. The coating, applied in layers including a zinc primer and PTFE topcoat, ensures long-term protection and ease of assembly and disassembly. Available in multiple colors like blue, green, red, black, and white, these fasteners are a reliable solution for critical fastening applications.
Hot Dip Galvanized Fasteners are steel or iron components that undergo a zinc coating process to enhance corrosion resistance and increase longevity in harsh environments. This is achieved by immersing the fastener in a bath of molten zinc, forming a metallurgically bonded coating that protects the underlying metal from rust and chemical attack.
These fasteners are widely used in outdoor, industrial, and marine applications due to their durability and ability to withstand prolonged exposure to moisture, salt, and pollutants. The coating not only provides sacrificial protection but also offers a robust barrier against mechanical damage. Hot Dip Galvanized Fasteners are particularly favored in infrastructure, construction, power transmission, and fencing projects.
Yellow Zinc Plated Fasteners are steel fasteners coated with a layer of zinc, followed by a yellow chromate finish that enhances corrosion resistance and provides a distinctive gold-yellow appearance. This electroplating process offers both functional and aesthetic advantages, making these fasteners suitable for applications where moderate corrosion protection and visual identification are important.
The yellow chromate coating adds an additional layer of corrosion protection over standard zinc plating and is commonly used in indoor and mildly corrosive environments. These fasteners are often found in automotive assemblies, electrical components, furniture hardware, and light industrial equipment where durability, appearance, and cost-effectiveness are key.
Blue Zinc Plated Fasteners are steel fasteners that have been electroplated with a zinc layer and treated with a blue chromate passivation. This coating provides a clean, bright, slightly bluish finish while offering moderate corrosion protection. Blue zinc is often chosen for its balance between aesthetics, cost, and rust resistance, making it a popular choice across general manufacturing and assembly industries.
The blue chromate finish is typically used in non-extreme environments such as indoor or mildly corrosive conditions. It helps prevent oxidation of the underlying metal and extends the service life of the fastener without significantly increasing production costs. Blue zinc plated fasteners are widely used in appliances, construction hardware, furniture fittings, and automotive parts.
Black Zinc Plated Fasteners are electroplated steel fasteners treated with a black chromate conversion coating over zinc. This finish provides a sleek black appearance along with moderate corrosion resistance. The black zinc plating not only enhances aesthetic value but also improves surface durability and performance in mildly corrosive environments.
Ideal for applications where appearance and basic corrosion protection are both important, black zinc plated fasteners are commonly used in automotive components, furniture, consumer electronics, and machinery. The coating is thin and uniform, making it suitable for precision components where dimensional tolerances are critical.
Zinc Cobalt Plated Fasteners are high-performance electroplated fasteners that offer significantly enhanced corrosion resistance compared to standard zinc coatings. The plating consists of zinc alloyed with 0.8% to 1.5% cobalt, providing exceptional durability, improved wear resistance, and superior adhesion for chromate conversion coatings.
This advanced coating is widely used in the automotive and aerospace industries where extended salt spray resistance and high mechanical strength are required. Zinc cobalt plating offers a uniform, bright silver to blue finish and is often preferred in critical applications that demand long-term corrosion protection under harsh conditions.
Aluminum Zinc Flake Coated Fasteners are designed to deliver outstanding corrosion protection without the risk of hydrogen embrittlement. This non-electrolytic coating system consists of overlapping flakes of aluminum and zinc embedded in an inorganic matrix, forming a durable barrier that resists extreme environmental conditions.
This coating is especially popular in the automotive, wind energy, construction, and heavy machinery sectors due to its long-lasting performance in salt spray and cyclic corrosion tests. Aluminum Zinc Flake coatings are typically water-based, solvent-free, and meet global environmental standards such as RoHS and ELV directives.
Black Phosphate Fasteners are coated with a fine crystalline layer of zinc phosphate followed by a black dye and oil sealant. This conversion coating enhances corrosion resistance, improves paint adhesion, and reduces friction during assembly. The black phosphate finish provides a sleek, matte appearance and is commonly used in indoor and low-humidity environments.
These fasteners are especially suited for automotive, electrical, appliance, and general-purpose industrial applications where moderate corrosion resistance and a smooth finish are essential. While not recommended for outdoor or high-moisture environments without additional coating or sealants, they provide a cost-effective solution for many standard fastening needs.
Zinc Plated Fasteners are coated with a layer of zinc to provide corrosion resistance and improve the durability of the fastener. The plating process involves electroplating the fastener with a thin layer of zinc, which helps prevent rust and extends the life of the fastener, especially in moderately corrosive environments. The zinc coating also provides a smooth finish, making assembly easier.
Commonly used in construction, automotive, manufacturing, and home applications, zinc plated fasteners are cost-effective solutions for environments where exposure to moisture is limited. These fasteners are available in a variety of sizes and grades to meet diverse application requirements.
Nickel Plated Fasteners are coated with a layer of nickel to offer enhanced corrosion resistance, durability, and aesthetic appeal. The nickel plating process involves electroplating the fastener with a thin layer of nickel, which provides a smooth, shiny surface that resists oxidation and enhances the fastener’s performance in harsh environments. Nickel plated fasteners are ideal for applications requiring both corrosion protection and an attractive finish.
These fasteners are commonly used in industries such as automotive, aerospace, electronics, and marine, where resistance to corrosion, wear, and tarnish is crucial. Nickel plated fasteners also offer good resistance to high temperatures, making them suitable for demanding applications.
Chrome Plated Fasteners are coated with a layer of chromium to provide superior hardness, corrosion resistance, and a shiny, smooth surface finish. The electroplating process used to apply the chromium layer enhances the fasteners' ability to withstand wear, environmental stress, and corrosion, particularly in challenging conditions. Chrome plated fasteners are known for their aesthetic appeal, strength, and ability to resist tarnishing, making them ideal for a wide range of industrial and decorative applications.
These fasteners are widely used in industries such as automotive, manufacturing, electronics, and architecture, where both functionality and appearance are important. The high durability and excellent resistance to corrosion make them a preferred choice for both internal and external applications.
Cadmium Plated Fasteners are coated with a layer of cadmium to provide enhanced corrosion resistance, especially in harsh environments. This electroplating process gives the fasteners a distinctive dull gray or matte finish while offering superior protection against rust and corrosion. The cadmium coating is particularly effective in environments with high humidity or exposure to corrosive chemicals, making it an excellent choice for industries such as aerospace, military, and marine.
These fasteners are widely used in applications where durability and resistance to corrosion are critical. The cadmium plating process also offers lubricity, reducing the likelihood of galling or seizing during assembly and disassembly. While cadmium plating is highly effective, it is often used in situations where the plating will be subjected to wear or environmental stress.
Copper Plated Fasteners are coated with a thin layer of copper, offering excellent electrical conductivity, corrosion resistance, and a distinctive shiny finish. This type of plating provides superior protection against corrosion, particularly in environments that require excellent resistance to heat and humidity. Copper plating is widely used in industries that demand electrical conductivity and enhanced aesthetic appeal.
Commonly used in electronics, automotive, and industrial applications, copper plated fasteners provide durability and protection while maintaining a low risk of galling and ensuring ease of assembly and disassembly. The copper coating is especially useful in applications where superior conductivity is essential, and it also improves the fastener’s resistance to tarnishing and corrosion.
Silver Plated Fasteners are coated with a thin layer of silver, providing excellent conductivity, corrosion resistance, and a smooth, attractive finish. The silver coating enhances the fastener's performance in applications where superior electrical conductivity, resistance to corrosion, and durability are essential. Silver plating is commonly used in high-performance applications, including electronics, aerospace, and electrical industries.
Silver plating improves the fastener's resistance to oxidation and ensures long-term reliability in harsh conditions. It is particularly beneficial in environments that require high conductivity and resistance to tarnishing. Silver plated fasteners are ideal for use in electrical connections, high-frequency applications, and areas exposed to corrosive environments.
Tin Plated Fasteners are coated with a thin layer of tin, offering improved corrosion resistance and enhanced solderability. The tin plating provides a durable, smooth finish that protects fasteners from oxidation and extends their service life. Tin plating is commonly used in electronics, automotive, and electrical applications where superior corrosion protection, electrical conductivity, and ease of soldering are essential.
The tin coating offers excellent protection against corrosion in humid environments and ensures reliable performance in various industries, particularly where the fasteners are exposed to moisture and harsh conditions. Tin plated fasteners are also known for their non-reactive properties, making them ideal for use in food and beverage processing equipment.
