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Coating : Coated bolts
Electrolytic Zinc Plating
7EBB Industries operates an exclusive Hot-Dip Galvanizing facility that functions 100% under the continuous supervision of our Quality Control (QC) Department. This ensures consistent coating quality, superior corrosion resistance, and full compliance with industry standards.
In addition, 7 Eleven Baseline Bolts Industries features a state-of-the-art in-house Electrolytic Zinc Plating facility, designed to support fast turnaround times and quicker deliveries. This facility also operates under the strict monitoring of our in-house QC team.
The electrolytic zinc plating process uses electrolysis in an aqueous solution to deposit a uniform zinc coating onto the product surface. This produces a smooth, bright, and corrosion-resistant finish. The coating thickness typically ranges from 5 to 40 microns, depending on the immersion time and the current density in the zinc bath.
Coating time varies based on product size, geometry, and the required zinc thickness, ensuring optimal protection for each application.
Cadmium plated
Hot Dip Galvanized
The in-house Hot-Dip Galvanizing facility at 7EBB operates entirely under the strict supervision of our Quality Control (QC) Department. All products are galvanized in accordance with the globally recognized ISO 1461 standard, which is fully comparable to the ASTM A153 standard.
Hot-dip galvanizing of fasteners is carried out using a centrifuge process supported by elevated zinc bath temperatures. During this process, products are fully immersed in a molten zinc bath, where solid zinc is heated to approximately 400°C. As the fasteners are withdrawn from the bath, they are coated with a uniform layer of liquid zinc, which solidifies instantly, forming a durable, corrosion-resistant protective coating.
PTFE / Xylan Coated Bolted
Whitford, UK is the primary supplier of fluoropolymer topcoats for 7 Eleven Baseline Bolts Inc. Xylan® is a high-performance fluoropolymer coating manufactured by Whitford Corporation and is widely recognized for its excellent lubricity and corrosion resistance.
The Xylan 1014 and 1070 series offer exceptionally low friction coefficients (as low as 0.02) and provide corrosion resistance of up to 1,000 hours in ASTM B117 salt spray testing when applied over phosphate. When applied over electroplated coatings, corrosion resistance can reach approximately 2,000 hours.
The Xylan 1400 series further enhances performance, delivering nearly 1,500 hours of corrosion resistance when applied over a suitable basecoat such as zinc electroplating.
Bichromated zinc yellow
Bichromated zinc yellow is an electrolytic (galvanic) coating process in which a zinc layer is deposited on the surface of the product using electrolysis. The process utilizes an aqueous zinc solution, resulting in a smooth, bright, and corrosion-resistant finish.
The coating thickness typically ranges from 5 to 40 microns, and is precisely controlled by the current density and the immersion time in the plating bath. This finish provides both enhanced corrosion protection and improved appearance, making it suitable for a wide range of fastener applications.
Dacromet
Sherard zinc plating
Also referred to as sherardizing, this process is widely used to apply a uniform zinc coating to fasteners in order to provide superior corrosion protection. In this method, the components to be coated are placed inside a rotating steel barrel along with a measured quantity of zinc dust.
The sealed barrel is then heated in a furnace at approximately 420°C. During this thermal process, the zinc diffuses into the steel surface, forming a zinc–iron alloy layer with a typical thickness of 15–25 microns. This metallurgically bonded coating delivers excellent corrosion resistance, uniform coverage, and high durability, even on threaded components.
Electroless Nickel Plated
Electroless Nickel Plating (ENP) is an autocatalytic chemical deposition process used to apply a hard, uniform, and corrosion-resistant nickel–phosphorus alloy coating onto a metallic surface. Unlike electroplating, ENP does not require electricity, allowing for excellent uniform thickness, even on complex geometries and internal threads.
Nickel is a naturally yellowish metal that is widely used to provide both a decorative finish and superior corrosion protection. To ensure maximum performance, the deposited nickel layer is sealed after plating, further enhancing its resistance to corrosion. The coating is required to be pore-free for optimal protection.
The typical ENP coating thickness ranges from 20 microns to 40–50 microns, which is sufficient to guarantee the desired level of corrosion resistance. In certain applications where peroxidation or controlled deposition is involved, a thinner layer may be specified.
ENP finishes can be supplied in matte, semi-bright, or bright appearance based on customer requirements. After ENP, the components may also undergo chrome plating, if specified, to further enhance appearance and surface durability.
Mechanical zinc plating
Mechanical zinc plating is a cold coating tumbling-barrel process used to apply a zinc coating with a thickness ranging from 3 to 80 microns onto a pre-treated steel surface. In this method, components are rotated inside a barrel together with a mixture of tiny glass beads, zinc powder, and chemical binders. The zinc is mechanically bonded to the steel surface through controlled impact and peening action.
After coating, the zinc surface is typically passivated or lubricated to enhance corrosion resistance, improve appearance, and provide better torque–tension control during fastening.
Unlike electrolytic zinc plating, mechanical zinc plating does not involve hydrogen generation during the process. Therefore, it eliminates the risk of hydrogen embrittlement, ensuring that high-strength fasteners retain their full mechanical integrity without weakening.
Chromium Plating
Chromium is a bluish-white metal widely used to provide both decorative finishes and corrosion protection. In decorative chromium plating, a nickel undercoat is always applied first. The chromium layer deposited over the nickel is extremely thin and primarily imparts the distinctive bright, mirror-like appearance to the product.
For effective corrosion resistance, the nickel layer must be completely sealed from the environment and free of pores. In simple terms, the nickel coating should typically be maintained at a minimum thickness of 20 microns and up to 40–50 microns to ensure reliable protection. In some cases, a thinner nickel layer may occur due to surface oxidation during processing.
In chromium plating, the final shine and visual quality of the product are largely determined by the deposited nickel layer, while the chromium top layer serves as the protective and aesthetic finish.