3/8 1/2 ASTM A193 A194 U type metal bolt with nut washer B7 B16 A325 A307 Zinc plating

U-shape is generally used in cargo vehicles, it is used to stabilise the chassis and frame of the vehicle. For example, the steel plate spring is U-bolt to connect.

U bolts are widely used, the main uses include:

• Construction and installation
• Mechanical parts connection
• Vehicles and ships
• Bridges, tunnels and railways

Main shapes: semi-circular, square right angle, triangle, oblique triangle, etc.

U-bolt heat tightening is suitable for what occasions:

Thermal tightening is the internal control of the medium temperature requirements of the pipeline bolts, in addition to the construction of the fastening, the need to reach a constant temperature or different temperatures in a process of work and then the fastening. And in normal use, the temperature rises, the bolt is subjected to thermal expansion, the gap increases, the need to complete the sealing from zero by hot tightening operation.

In general, the requirements of the internal temperature > 200 ℃ in the equipment, pipelines, etc., need to bolt fastening heat tightening.

Hebei Wanxin Fastener Manufacturing Co., Ltd, the main production of products are: U bolts, steel bolts, ground bolts, flange, double-headed bolts, highways, railways, underground supporting fasteners, a variety of pre-embedded parts, high-strength bolts, high-strength hexagon, scaffolding, through the wire water-stop screws, high-strength nuts, through the wall wire reinforcing stirrups,, step by step, the top bracket, butyl threads, water-stopping steel plate and so on.

With the growing awareness of environmental protection, the environmental performance of U-shaped bolts has also become a focus of attention. In the production process, the use of environmentally friendly materials and processes to reduce energy consumption and pollutant emissions has become an important development direction of the U-shaped bolt industry.

Zinc is soluble in acids as well as in bases, so it is called an amphoteric metal. Zinc undergoes little change in dry air. In humid air, a dense film of zinc alkali carbonate is formed on the surface of zinc.

The standard electrode potential of zinc is -0.76V, for the steel substrate, zinc plating belongs to the anodic plating, which is mainly used to prevent corrosion of steel, the advantages and disadvantages of its protective properties and the thickness of the plating is very large. Zinc coating can significantly improve its protective and decorative properties after passivation treatment, dyeing or coating with gloss protection agent.

What are the advantages of galvanising?

• Corrosion Protection: Galvanising provides superior protection to the surface of iron, steel or other metals.
• Low Cost: Galvanising is a relatively inexpensive method of corrosion protection.
• Enhanced Properties: The galvanising process provides a small increase in the strength, toughness, abrasion resistance.
• Longevity: A zinc coating has a life expectancy of almost 20 to 25 years.
• Easy to repair: It is relatively easy to repair affected areas with zinc-rich paints.
• Aesthetically appealing: Galvanising gives metal surfaces an attractive, shiny silver appearance.

Bolts of grade A-193B7M have the same chemical composition as grade B7 and are hardened and tempered to achieve a lower hardness. They also have lower tensile strength than B7 grade bolts. They are typically used in stress corrosion cracking environments/floating head heat exchangers.A-194 Grade 2HM nuts are similar to Grade 2H nuts and are recommended for stress corrosion cracking environments.
Grade A-193B16 bolts are primarily used in high temperature applications from 400°C to 595°C. They are made of chromium-molybdenum-vanadium alloy steel. grade B16 bolts have mechanical strength similar to grade B7, but the fasteners retain their strength at high temperatures and relax less at high temperatures. grade B16 bolts can be matched with two main grades of nuts: grades 4 and 7, which are heat-treated chromium-molybdenum steel nuts for use in sub-zero conditions down to -48°C. It should be mentioned that As a rule, B16 grade bolts should be used with Grade 7 (or Grade 4) nuts, as they have similar characteristics.