M5 M6 Mild steel U type metal bolt with nut washer Galvanized grade 4.8 class 4.8 Blue U bolts

U-shape bolts are generally used in cargo vehicles to stabilize the chassis and frame of the vehicle. For example, the steel plate spring is connected using U-bolts.

U bolts are widely used in construction and installation, mechanical parts connection, vehicles and ships, bridges, tunnels and railways.

• Main shapes: Semi-circular, square right angle, triangle, oblique triangle
• Material properties: Density, bending strength, impact toughness, compression strength, modulus of elasticity, tensile strength, temperature resistance
• Common materials: Carbon steel Q235A Q345B, alloy steel, stainless steel (201, 304, 321, 304L, 316, 316L)
• National standard: JB/ZQ4321-2006

U-bolt heat tightening is suitable for applications where the internal temperature requirements of the pipeline bolts exceed 200°C. In these cases, after initial construction fastening, additional tightening is required when reaching constant or different temperatures during operation.

Hebei Wanxin Fastener Manufacturing Co., Ltd specializes in producing various fasteners including U bolts, steel bolts, ground bolts, flanges, double-headed bolts, and other construction fasteners.

With growing environmental awareness, the U-bolt industry is focusing on using eco-friendly materials and processes to reduce energy consumption and emissions, contributing to sustainable development.

The performance grade of bolts for steel structure connection is divided into 3.6, 4.6, 4.8, 5.6, 6.8, 8.8, 9.8, 10.9, 12.9 and so on, more than 10 grades, of which the material of bolts of grade 8.8 and above is low-carbon alloy steel or medium-carbon steel and heat-treated (quenched and tempered), commonly known as high-strength bolts, and the rest are commonly known as ordinary bolts. Bolt performance level marking has two parts of the digital composition, respectively, that the nominal tensile strength of the bolt material value and the value of the flexural strength ratio. For example:

Performance level 4.6 grade bolts, the meaning of which is:

The nominal tensile strength of the bolt material is 400MPa;
The value of the yield-strength ratio of the bolt material is 0.6;
The nominal yield strength of the bolt material is 400×0.6=240MPa.
Performance grade 10.9 high-strength bolts, the material of which is heat-treated to achieve:
The nominal tensile strength of the bolt material reaches 1000MPa grade;
The yield strength ratio of the bolt material is 0.9;
The nominal yield strength of the bolt material reaches 1000×0.9=900MPa grade.