What are the grades of bolts?
What are the grades of bolts?
There are several grades of bolts but the three common grades for SAE are 2, 5 and 8. The common class (grades) for metric are 5.8, 8.8, 10.9 and 12.9. Each grade has a specific bolt strength. No matter the system used to grade the bolts, the higher number means the stronger the bolt.
What material is used for bolts?
steel
The most common material for mechanical fasteners, such as bolts and screws, is steel. Different grades of steel are available, depending on the strength required. If rust or corrosion is a concern, stainless steel, brass, or titanium may be used.
What metal is best for bolts?
carbon steel
Materials of Construction Nearly all fasteners use carbon steel. It has the widest range of workability and range of strength properties. There are even low carbon steels such as ASTM 307 Grade B, which are used for heavy hex bolts and studs intended for flanged joints in piping systems with cast iron flanges.
What is the strongest material for a bolt?
Commercial-grade 8 bolts are the strongest option available. They’re made from medium carbon alloy steel and have markings that include six raised dashes. The psi of the bolt is 150,000, meaning that it can withstand great deals of pressure because of the way it was quenched and tempered.
What is the hardest grade bolt?
Grade 8
Grade 8 is the hardest, Grade 5 is medium, and Grade 2 is the softest. This is the most common grade of steel fastener and is the least expensive. Grade 2 bolts have no head marking, although sometimes a manufacturer’s mark is present.
What grade of steel is used in bolts?
Carbon Steel Bolt Grades Carbon steel is the most common type of steel used in fastener production. Grades 2, 5, and 8 are typically the standard for carbon-steel based screws and bolts, with alloyed carbon steel being a higher-end variation on these metals.
Is Grade 5 stronger than stainless steel?
A stainless steel bolt has the same PSI rating as a grade 5 bolt (125,000 PSI). A grade 8 bolt has a stronger rating with a PSI of 150,000.
What are bolt specifications?
Mechanical Specifications. The mechanical specifications such as tensile strength and yield strength differ slightly depending on the size of the bolt. However, the minimum tensile strength for A4-70 bolts is 800 MPa, while the minimum yield stress of the bolt is 600 MPa.
What is a bolt specification?
The American Society for Testing and Materials is an international standards organization that develops and publishes voluntary consensus technical standards for a wide range of materials, products, systems, and services. Bolt Specifications ASTM A193 Alloy steel and stainless steel bolting materials for high temperature or high pressure service.
How do you identify bolts?
How to Identify a Metric Bolt. You identify grade by looking at the head of the bolt. Hex bolts will have 10.9 (equivalent to SAE grade 8), 8.8 (equivalent to SAE grade 5), or no markings (equivalent to SAE grade 2). Diameter and length are identified in millimeters. For instance, 10 x 110, 10.9 would be a hex head capscrew 20-mm in diameter,…
What do the grades of bolts mean?
A. The grade of a bolt indicates the tensile strength of the steel. The higher the number the harder it is. The most common grades are 2, 5 and 8.