Benefits of Using ASTM A320 L7 Bolts and A2-70 Bolts

Material selection for bolting systems is sometimes a compromise weighing factors such as mechanical strength, environmental resistance and meeting international standards. ASTM A320 L7 Bolts are regarded as a good choice in conditions of high stress and low temperature as they have excellent toughness, thanks to the heat treated alloy steel. The tensile strength of these bolts is near 125 ksi and they retain their ductility even in very cold conditions. This makes them very good candidates for LNG plants pressure vessels and offshore platforms. Besides, nuts of ASTM A194 grade 7 are compatible with them, and they also have an impact test requirement which is compulsory to improve their reliability under dynamic loading conditions. The availability of these bolts in large diameters and different thread configurations further increases their suitability for heavy engineering assemblies where structural integrity is very important.

A2-70 Bolts are made of 304 stainless steel and have been cold worked to a minimum tensile strength of 700 MPa. This makes them quite corrosion resistant and preferable for use in environments where there is exposure to water or mild chemicals but at the same time they are not very expensive in a combination with mechanical properties. That's why these fasteners are used in a lot of industries. They are resistant to oxidation, moisture, and mild chemicals without the need for any additional coating. Their ability to deliver steady performance in marine hardware, food processing equipment and architectural installations has been made possible thanks to EN ISO 3506 standards. Their handy metric sizing along with the fact that they are non-magnetic and easy to install have a significant impact on reducing the maintenance and increasing the service life. They should not be used for extremely hot or high pressure conditions but for general environmentally friendly fastening they do a good job.