Colored Zinc-Plated Flange Connection Bolt

• Customization: Available
• Material: Carbon Steel
• Type: Round Head
• Model NO.: GB/T 16674.1-2016
• Connection: Common Bolt
• Head Style: Round
• Standard: DIN, GB
• Grade: 8.8
• Application: Machinery, Chemical Industry, Environmental, Building
• Finish: Color-Zinc Plated
• Transportation Mode: by Sea
• Transport Package: Bag
• Specification: M6-M64
• Trademark: LING KE
• Origin: Yong Nian
• HS Code: 731815
• Production Capacity: 200000/Year
• Package Size: 60.00cm * 30.00cm * 30.00cm
• Package Gross Weight: 50.000kg

Product Description

Colored zinc-plated flange connection bolts feature a specialized coating process that combines zinc plating with chromate passivation, resulting in a vibrant iridescent finish (typically blue, yellow, or rainbow hues). 

Multi-Layer Colored Zinc Coating for Enhanced Corrosion Resistance

Versatile Sizing and Thread Configurations

Wide-Ranging Applications Across Industries

Colored zinc-plated flange connection bolts feature a specialized coating process that combines zinc plating with chromate passivation, resulting in a vibrant iridescent finish (typically blue, yellow, or rainbow hues). This multi-layer protection system—consisting of a zinc base layer (5-15μm thick) and a chromate conversion layer—significantly boosts corrosion resistance compared to plain zinc plating. The zinc acts as a sacrificial anode, corroding preferentially to protect the underlying steel, while the chromate passivation seals the zinc layer, preventing white rust formation. Conforming to standards like ISO 4042 or ASTM B633, these bolts excel in moderately corrosive environments such as indoor industrial facilities, HVAC systems, or light outdoor applications (e.g., building facades), maintaining structural integrity for 500+ hours in salt spray tests.

These bolts offer extensive size flexibility to match diverse flange connection needs. Metric thread sizes range from M6 to M64, with lengths spanning 30mm to 300mm, while imperial options include 1/4"-2" diameters with UNC/UNF threads. Common configurations include full-threaded designs for thin flanges (e.g., M12×80 for DN100 PN16 pipe flanges) and partial-threaded variants with unthreaded shanks for high-strength applications (e.g., M20×120 for heavy machinery flanges). The flange head dimensions are precision-engineered—with hexagon across flats ranging from 10mm (M6) to 80mm (M48)—to ensure compatibility with standard wrenches, while the integrated flange face eliminates the need for separate washers, enhancing sealing and load distribution.

Colored zinc-plated flange bolts are valued for their blend of corrosion resistance, aesthetics, and functionality across sectors. In the plumbing and HVAC industry, they secure pipe flanges in residential and commercial buildings, withstanding moisture from water or air ducts without rusting. In electrical engineering, they fasten equipment enclosures and panel flanges, where the colorful finish aids in visual inspection and compliance with safety standards. Automotive and machinery manufacturing utilize them for non-critical flange joints (e.g., accessory brackets or cover plates), balancing cost-effectiveness with protection against workshop oils and humidity. Their attractive finish also makes them suitable for visible applications like furniture hardware or architectural fixtures, where both performance and appearance matter.

Item	Details
Structural Composition	Colored zinc-plated flange connection bolts
standard	GB/T 16674.1-2016
Surface Treatment	Colored zinc-plated

Packing & Delivery

 Corrugated cartons

Packing Quantity:
Retail/small orders: Typically 10 pieces, 50 pieces, or 100 pieces per box, depending on the size. For example, M6-M10, 3-piece shield anchors are commonly packed 100 pieces per carton.
Wholesale/large orders: Larger quantities like 500 pieces, 1000 pieces, or 2000 pieces per carton are available, which is more cost-effective for bulk purchases.
Packaging Dimensions:
The size of the carton depends on the anchor specifications and packing quantity. For instance:
A carton containing 100 pieces of M8×60mm 3-piece shield anchors may have dimensions of approximately 300×200×150mm.
A larger carton with 1000 pieces of M12×90mm anchors could measure around 500×350×300mm.
Labeling:
Each package is clearly labeled with key information, including product name ("3-piece Shield Anchor"), specification (e.g., "M6×50mm"), material, surface treatment (e.g., "Hot-dip Galvanized"), quantity, net weight, gross weight, manufacturer's name, and logo. Handling marks such as "Keep Dry", "Handle with Care", and "Stack Height Limit" are also printed on outer cartons to guide proper storage and transportation.

Company Profile

Company Name

 Hebei LING KE Metal Products Manufacturing Co.has firmly established itself as a leading force in the fastener industry, with a rich history and a commitment to excellence that spans over 10 years. Since its inception, the company has been dedicated to providing high-quality fasteners and comprehensive fastening solutions to a diverse range of industries worldwide.In recent decades, Hebei LING KE Metal Products Manufacturing Co. has expanded its footprint globally, establishing strategic partnerships and distribution centers in key regions around the world. This has allowed the company to better serve its international customer base and meet the growing demand for its products in emerging markets.