ASTM A193 B7 Threaded Rod

High-strength Screw connections offer several advantages, including simple construction, excellent stress performance, detachable replacement, fatigue resistance, and resistance to loosening under dynamic loads, making them a highly promising connection method. ASTM A193 B7 Threaded Rods exemplify this high-strength screw variant.

These rods are tightened using specialized wrenches to generate significant and controllable pre-tension forces. Similarly, the connector, through nuts and washers, also produces the same level of preload. This preload induces substantial friction along the connector's surfaces. Consequently, as long as the axial force remains below this frictional force, the components will remain stable without sliding or sustaining damage. This embodies the fundamental principle behind high-strength screw connections.

The effectiveness of high-strength screw connections relies on the friction between the contact surfaces to prevent slippage. To ensure sufficient friction on these surfaces, it's crucial to enhance the clamping force between components and increase the friction coefficient of the contact surfaces. Achieving adequate clamping force is accomplished by applying pre-tension to the rods, necessitating the use of high-strength steel for the rods themselves, hence the term "high-strength screw connections."

In these connections, the friction coefficient significantly impacts the bearing capacity. Experiments have shown that the friction coefficient is primarily influenced by the contact surface's form and the component material. To boost the friction coefficient of the contact surface, techniques like sandblasting and wire brushing are commonly employed during the construction process.