Grade 8.8 Class 12.9 Gavalnized Carbon Steel U shape metal bolt with nut washer M18 M20
| Attribute | Value |
|---|---|
| Usage | Fastening |
| Size | Various sizes available |
| Style | Steel U shape bolt with washer nut |
| Head Style | U shape bolt/U type bolt |
| Strength | High |
| Finish | Polished |
| Manufacturer | JIA SHAN Hardware Company |
| Length | Customizable |
| Package | Small Packing + Carton Packing + Pallet |
| Standard | DIN |
| Package Quantity | 100 pieces |
| Shape | U Bolt |
| Measurement System | INCH, Metric |
| Port | Shenzhen |
| Quality | Inspection before shipment |
| Color | Customizable |
| Material | Steel: 304/316/301/310/201 |
U-shape bolts are commonly used in cargo vehicles to stabilize chassis and frame components, such as connecting steel plate springs. These versatile fasteners find applications in:
- Construction and installation projects
- Mechanical parts connection
- Vehicle, ship, bridge, tunnel, and railway applications
Available in various shapes including semi-circular, square right angle, triangle, and oblique triangle configurations.
Material Properties: Density, bending strength, impact toughness, compression strength, modulus of elasticity, tensile strength, temperature resistance, and color can be customized based on environmental requirements.
Screw strength 8.8 and 12.9 difference: First, the grade is different, screws according to the strength of different grades, 12.9 and 8.8 is the grade index; Second, the degree of toughness is different, 12.9 level of screws tougher than the 8.8 index; Third, the direction of use is different, 12.9 screws are used in textile and hydraulic and other large-scale machines, 8.8 screws to small electronic products.
Screws 12.9 and 8.8 in terms of grade is their biggest difference, different screws will use different models to do the distinction. In addition to 8.8 and 12.9 grade screws on the market, there are 3.6, 4.6, 4.8, 5.5, 6.8, etc., these screws in the grade of only 8.8 screws can be called high-strength screws, 8.8 can only be counted as ordinary screws. Because of the different grades, the performance is also different, so we have to buy according to their own needs to buy the appropriate level of screws.
| No. | C% | Cr% | Ni% | Mo% |
|---|---|---|---|---|
| 304 | 0.07 | 17.5-19.5 | 8.0-10.5 | / |
| 316 | 0.08 | 16.0-18.0 | 10.0-14.0 | 2.00-3.00 |
| 301 | 0.15 | 16.0-18.1 | 6-8 | / |
| 310 | 0.08 | 24-26 | 19-22 | / |
| 304L | 0.03 | 18-20 | 8-12 | / |
| 316L | 0.03 | 16-18 | 10-14 | 2-3 |
| 321 | 0.08 | 17-19 | 9-12 | / |
U-bolt heat tightening is essential for applications with internal temperature requirements exceeding 200°C, particularly in equipment and pipelines where thermal expansion affects bolt performance.
With growing environmental awareness, the U-bolt industry focuses on sustainable practices, including:
- Using eco-friendly materials and production processes
- Reducing energy consumption and emissions
- Developing innovative materials for improved performance
These fasteners serve critical roles in both traditional sectors (construction, machinery, automotive) and emerging fields (aerospace, renewable energy).
Zinc plating provides excellent corrosion resistance through:
- Anodic protection for steel substrates
- Enhanced durability in various environments
- Improved aesthetics after passivation treatment
Electro-zinc plating deposits a uniform, protective coating ideal for fasteners and automotive components.
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