Grade 12.9 Hex Head Machine Bolt with Spring & Flat Washers Zinc Plated

1.Products Details:

This assembly is a pre-configured fastening solution combining three components:
1. Cross Recessed Hexagon Head Bolt: Features a hexagonal shank for wrench tightening and a cross-shaped recess (Phillips drive) for screwdriver compatibility, offering dual-tool accessibility.
2. Spring Washer: A helical washer that provides tension and vibration resistance, preventing loosening under dynamic loads.
3. Flat Washer: A thin circular washer placed between the bolt head and the surface, distributing pressure evenly and protecting the material from damage.

2.Key Features:

- Saves time by eliminating separate component handling during installation.
- Spring washer reduces loosening in high-vibration environments (e.g., automotive, industrial machinery).
- Flat washer prevents bolt head indentation on soft materials (e.g., wood, aluminum).
- Hex head + cross recess allow flexibility in installation tools.

3.Technical Parameters of Hex Bolt with lock and plain washer

4.Certificate Display

5.Production Process

6.Packaging and shipping Details

Ningbo Yongbiao Fastener Manufacturing Co., Ltd. is located in Ningbo, the second largest port city in China. The factory is 50 kilometers away from Ningbo Port and can reach the sea freight warehouse in one hour, with very fast logistics. The company was founded in 2012 and after years of hard work and development, it has become a factory covering an area of over 2000 square meters with a registered capital of 6.8 million yuan. So far, the company has two holding subsidiaries and has gradually developed into a medium-sized fastener manufacturing enterprise integrating research and development, production, and sales. Currently, the factory has more than 50 employees and complete production and testing equipment, including more than 50 production equipment and more than 10 testing equipment. The factory has an annual production capacity of 4000-5000 tons of fasteners and an annual output value of 40-50 million RMB. Our products have a normal delivery time of 20-30 days and a stock time of 1-5 days. Our independent brand "YB" accepts OEM, ODM. Our main products include various fasteners, standard parts, bolts, screws, wood screws, self tapping screws, turning screws, combination screws, nuts, accessories, flat washers, lifting rings, etc. In addition, we also have multiple CNC lathes and milling machines to provide customized fastener services for customers. The company's products are mainly used in the fields of automobiles, machinery, electronic equipment, sheet metal, security, new energy, etc., and have been widely praised by domestic and foreign customers. Welcome new and old customers to inquire.