Black Plated Flange Bolts

• Customization: Available
• Material: High Strength Steel
• Type: Hexagon Head
• Model NO.: GB/T 16674.1-2016
• Connection: Common Bolt
• Head Style: Hexagonal
• Standard: DIN, GB
• Grade: 8.8
• Application: Machinery, Chemical Industry, Environmental, Building
• Finish: Black
• Transport Package: Bag
• Specification: M3-M24
• Trademark: LING KE
• Origin: Yong Nian
• HS Code: 731815
• Production Capacity: 100000/Year
• Package Size: 50.00cm * 20.00cm * 20.00cm
• Package Gross Weight: 50.000kg

Product Description

Black oxide flange bolts are a type of specialized fastener designed for secure and reliable connections in various industrial applications. Here's a detailed introduction to their key features, production process, performance characteristics, and typical uses:

Basic Structure

Black Oxide Coating Process

 Typical Applications

Similar to standard flange bolts, they consist of three main parts:

A hexagonal head for easy tightening with wrenches.
An integrated flange (a widened, flat disc) beneath the head, which eliminates the need for a separate washer. The flange distributes clamping force evenly across the connected surface, reducing pressure on materials and enhancing stability.
A threaded shank for screwing into nuts or tapped holes.

The defining feature is their black oxide finish, created through a chemical conversion process:

Bolts are immersed in a heated solution (typically containing sodium hydroxide and oxidizing agents) that reacts with the surface of the metal (usually carbon steel or alloy steel).
This reaction forms a thin, dense layer of iron oxide (magnetite, FeO) on the surface, giving the bolts their characteristic black appearance.
The process is often followed by a post-treatment (e.g., oiling or waxing) to seal the oxide layer, improving corrosion resistance and lubricity.

General Machinery: Used in gearboxes, pumps, and industrial equipment where even force distribution and basic corrosion protection are needed.
Automotive Industry: Applied in non-exposed components (e.g., engine brackets, chassis parts) where a black finish aligns with under-hood aesthetics.
Construction and Furniture: Suitable for indoor structural connections or furniture assembly, where moisture exposure is minimal.
Electrical Equipment: Used to secure panels or enclosures, as the non-reflective black surface reduces glare.

Packing & Delivery

Bag Packaging

Carton Packaging

Fasteners can be packaged in durable plastic bags, which are available in various sizes to accommodate different quantities (e.g., small batches of screws, nuts, or bolts). The bags are typically sealed by heat or with a zipper to prevent moisture, dust, and loss of contents. This method is lightweight, cost-effective, and suitable for retail sales, small shipments, or situations where easy access to the fasteners is needed. Additionally, clear plastic bags allow for quick visual identification of the products inside.

For larger quantities or bulk transportation, cartons are commonly used. These are sturdy cardboard boxes, often reinforced with corrugated layers to provide protection against impact during handling and shipping. Fasteners in cartons are usually pre-packed in bags or separated by dividers to avoid friction and damage. Cartons can be labeled with product details (e.g., type, size, quantity) and are stackable, optimizing storage and logistics efficiency. This method is ideal for industrial orders, wholesale distribution, or long-distance transportation where durability is a priority.

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.