Product Details
These robust bolts are defined by their industry-standard design, high-strength materials, and protective coating.
- External Hexagonal Head: The classic six-sided head is designed for use with standard wrenches, spanners, and sockets, allowing for easy, high-torque installation and removal.
- High-Strength Carbon Steel: Manufactured from quality carbon steel, these bolts are available in a range of property classes to suit different load requirements:
- Grade 4.8: A standard-strength steel for general-purpose, low-load applications.
- Grade 8.8: A high-tensile steel, ideal for most automotive, structural, and industrial applications requiring significant strength.
- Grades 10.9 & 12.9: Very high-strength steels for critical, high-stress applications where maximum tensile and shear strength are required.
- Yellow Zinc Plating (YZP): These bolts are electroplated with a layer of zinc, followed by a yellow chromate conversion coating. This process provides a thicker, more durable finish than standard clear (blue/white) zinc, offering significantly enhanced corrosion resistance. The yellow/gold finish makes them ideal for use in damp or moderately corrosive environments and allows for easy identification.
- Two Threading Standards:
- DIN 931 (Partial Thread): These bolts feature an unthreaded shank between the head and the threaded portion. The solid shank provides superior resistance to shear forces, making DIN 931 bolts the ideal choice for aligning structural components and for joints where the primary load is perpendicular to the bolt’s axis.
- DIN 933 (Full Thread): These bolts have threads running their entire length, from under the head to the tip. The full thread provides maximum engagement and adjustability, making DIN 933 bolts perfect for applications where the bolt is threaded into a tapped hole or when full clamping force along the entire bolt length is needed with a nut.
Product Parameters
The technical specifications for our DIN 931 / DIN 933 Yellow Zinc Plated Hex Head Bolts are detailed below.
| Parameter | Specification |
|---|
| Product Name | DIN 931 / DIN 933 Hex Bolt |
| Standard | DIN 931 (Partial Thread), DIN 933 (Full Thread) |
| Material | Carbon Steel |
| Property Class / Grade | 4.8, 8.8, 10.9, 12.9 |
| Surface Treatment | Yellow Zinc Plated (YZP) |
| Head Style | External Hexagonal |
| Diameter Range | M4 – M24 |
| Measurement System | Metric |
| Brand Name | Duojia |
| Place of Origin | Hebei, China |
| Key Feature | Enhanced corrosion resistance with yellow chromate finish |
| Application | Construction, Automotive, Heavy Industry, General Industry |
Product Features
These high-performance bolts are engineered to deliver strength, durability, and reliability:
- Enhanced Corrosion Resistance: The yellow zinc chromate plating offers superior protection against rust and corrosion compared to standard zinc finishes, extending the service life in outdoor or damp conditions.
- High Strength and Durability: Available in multiple carbon steel grades (including high-tensile 8.8 and 10.9) to securely handle demanding loads and stresses.
- Application Versatility: Offered in both DIN 931 (partial thread for shear resistance) and DIN 933 (full thread for maximum clamping force) to suit a wide variety of joint designs.
- Industry Standard Design: The external hex head is universally recognized and compatible with standard tools, ensuring ease of installation and maintenance.
- Easy Identification: The distinctive yellow/gold finish allows for quick and easy visual identification of the fastener type and coating.
- DIN Compliance: Manufactured to precise DIN standards to guarantee dimensional accuracy, consistent quality, and full interchangeability.
Product Applications
The combination of strength and enhanced corrosion resistance makes these bolts a staple in numerous industries:
- Construction: Ideal for connecting steel structures, timber framing, securing base plates, and general assembly in building projects.
- Automotive: Widely used for chassis assembly, engine and transmission mounts, suspension components, and other under-vehicle applications where strength and corrosion resistance are vital.
- Industrial Machinery: Perfect for assembling heavy equipment, machine frames, conveyor systems, and other manufacturing plant infrastructure.
- Agricultural Equipment: Used extensively in the assembly and repair of tractors, plows, harvesters, and other farm machinery that is frequently exposed to the elements.
- General Industry and DIY: A reliable choice for workshops, maintenance departments, and any project requiring a strong, corrosion-resistant hex bolt.
