Is B7 stronger than Grade 8?

B7 studs are made of chromium-molybdenum alloy steel that has been treated to reach specific hardness requirements. Grade 8 is rated at 150,000 psi while B7 is rated between 105,000 and 125,000 psi. Grade 8 is suitable for applications requiring higher tensile strength than B7 can provide.

What grade is B7 equivalent to?

ASTM A193 B7 is a chrome-moly steel with strength similar to Grade 5 properties and is commonly used in high temperature and pressure applications.

Is Grade 5 stronger than B7?

Grade B7 provides higher strength than Grade 5 bolts with greater ductility than Grade 8. Grade B7 is an excellent choice when a fastener that is stronger than Grade 5 is needed with better fatigue and toughness than a Grade 8.

What is the strength of a B7 bolt?

Grade B7 is a heat-treated chromium-molybdenum low-alloy steel with minimum tensile strength requirement of 125 ksi (860 Mpa), yield 105 ksi (720 Mpa), and maximum hardness of 35HRC.

Is Grade 8 or 12.9 stronger?

Used in high stress environments, grade 12.9 fasteners are the highest class of metric cap screws. Where Grade 8 fasteners have a 150,000 psi tensile strength, 12.9 fasteners have a 180,000 psi tensile strength, making them more durable than the grade 5.

Bolt grade explained

Is 12.9 stronger than 8.8 bolt?

Bolt Grade Numbers

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, the higher number means the stronger the bolt.

What is the difference between B7 and 8.8 bolts?

B7 studs are made of chromium-molybdenum alloy steel that has been treated to reach specific hardness requirements. Grade 8 is rated at 150,000 psi while B7 is rated between 105,000 and 125,000 psi. Grade 8 is suitable for applications requiring higher tensile strength than B7 can provide.

How strong is Grade B7?

Grade B7 is a heat-treated chromium-molybdenum (Cr-Mo) alloy steel with minimum tensile strength requirement of 125 ksi, yield 105 ksi, and maximum hardness of 35 HRC.

Is B7 equivalent to Grade 5?

Sometimes products may seem interchangeable, but certain applications may produce the circumstances that highlight the differences. While B7 and SAE Grade 5 fasteners have similar strengths, the B7 fasteners are intended for higher temperature applications.

Is 4140 the same as B7?

AISI-SAE 4140 Alloy Steel is starting raw material used for manufacturing ASTM A193 Grade B7 Bolts and other threaded fasteners. AISI-SAE 4140 is subsequently hardened / quenched using liquid medium followed by tempering to achieve mechanical properties as required in ASTM A193 Grade B7 specification.

Is a 10.9 bolt stronger than Grade 8?

Grade 8 is an SAE designation. 10.9 is a metric designation. But the two systems yield the same holding strength.

What is stronger than Grade 8?

Grade 9 structural bolts, also known as grade 9 hex cap screws, are one the strongest structural bolts that can be used today. While the typical grade 8 bolt has a tensile strength of 150,000 PSI, a grade 9 bolt has a tensile strength of 180,000PSI.

Is a Class 8.8 bolt the same as Grade 8?

DIN stands for “Deutsches Institut für Normung” which translates to the “German Institute for Standardization.” ISO stands for “International Organization for Standardization.” Synopsis: The similarity in names is purely coincidental and the Metric Class 8.8 is not as strong as the Inch Grade 8.

Is B7 stronger than grade 55?

Even though ASTM A193 Grade B7 has a higher tensile strength, they cannot be substituted. A193 Grade B7 has a minimum tensile strength of 125 ksi, while F1554 Grade 55 has a maximum tensile strength of only 95 ksi. Also, Grade B7 is not weldable.

What grade bolt is the strongest?

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 difference between Grade B7 and Grade 55?

Grade 55 is more elastic and available at a lower cost, rendering it more applicable for general construction needs, while B7 is heat treated and contains alloys that make it more suitable for corrosive environments.

What is the strongest threaded rod?

Due to its high tensile strength, B7 is one of the strongest materials in the industry. It is a grade of the spec A193 (Chromium Molybdenum). B7 achieves its strength through a heat-treating process where it is quenched and tempered at 1150 degrees F.

Is Grade 8 or stainless stronger?

Despite the popular belief, a stainless steel bolt is actually weaker than a grade 8 bolt. In fact, according to the Society of American Engineers (SAE), grade 8 bolts are the strongest and hardest hex bolt you would want to use in constructions or the automotive industry.

What is the difference between B7 and B8 studs?

B8 class 1 stainless steel bolts/studs have a minimum yield strength of 30,000 psi compared to a B7 alloy steel bolt with a yield strength of 105,000 psi. I have been involved in many RCA of gasket failures where the B8 bolts were simply unable to develop the necessary preload to seat the gasket.

What is Grade 8 equivalent in threaded rod?

ASTM A354 Grade BD all thread rod is equivalent in strength to SAE J429 Grade 8. It is manufactured from alloy steel, quenched and tempered.

What size is a B7 stud?

Grade B7 for Studs ASTM A-194. Grade 2H for Nuts. SIZE: 0.5" TO 2.75" Diameter & LENGTH: 2.5" TO 25"

What is a B7 stud used for?

B7 stud bolts are also known for their resistance to high pressures. These bolts are constructed to withstand high pressures without leaking or breaking. This makes them ideal for use in high-pressure applications, such as in the oil & gas industry, where they are commonly used in producing & transporting oil & gas.

Is B7 the same as A325?

In short, no, the thread length of A193 B7 bolts is not the same as the thread length of A325 bolts. The F3125 Grade A325 specification covers heavy hex structural bolts which have standard fixed thread lengths shown in the table below.

What is grade 8.8 equivalent to?

Class 8.8 is approximately equivalent to SAE J429 Grade 5, ASTM A449 & IFI 100/107 Gr. B (locknuts only) Class 10.9 is approximately equivalent to SAE J429 Grade 8 and ASTM A354 Grade BD & IFI 100/107 Gr.