Is Grade 8 the strongest?

A grade 8 bolt is the highest grade SAE bolt. Grade 8 bolts have a minimum tensile strength of 150,000 PSI. As a comparison, the ASTM A325 bolt is roughly equivalent to the SAE grade 5. A grade 8 bolt would be one that meets ASTM A490 standards.

What is higher than Grade 8?

Grade 12.9 bolts are generally considered stronger than Grade 8 bolts, as they have a higher tensile strength and yield strength. Grade 12.9 bolts are made from alloy steel and have a minimum tensile strength of 1220 MPa (177,000 psi) and a minimum yield strength of 1080 MPa (156,000 psi).

Is Grade 10 stronger than Grade 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, the higher number means the stronger the bolt. For most home and automotive applications, you won't need anything more than a grade 8 bolt strength or metric class 10.9.

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.

Which is stronger Grade 5 or 8?

Grade 8 bolts have been hardened more than grade 5 bolts. Thus they are stronger and are used in demanding applications such as automotive suspensions.

Strongest Bolt? Grades Explained & Dyno Tested For Science

Will a Grade 8 bolt break?

Grade 8 bolts are designated as a 150 ksi. This means its tensile strength or the resistance it has before it is subject to breaking under tension is equal to 150,000 lbs. per square inch. In comparison, a Grade 5 bolt is weaker as its tensile is 120 ksi, placing it at 120,000 lbs.

Is 10.9 stronger than Grade 8?

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

Is Grade 8 the hardest 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.

Is Grade 8 the strongest bolt?

A grade 8 bolt is the highest grade SAE bolt. Grade 8 bolts have a minimum tensile strength of 150,000 PSI. As a comparison, the ASTM A325 bolt is roughly equivalent to the SAE grade 5. A grade 8 bolt would be one that meets ASTM A490 standards.

Can Grade 8 bolts be hardened?

ASTM A325, ASTM A490 SAE grade 5 and SAE grade 8 fasteners are made of higher carbon plain or alloy steels, which can be hardened through a quenching and tempering process.

Is Grade 5 strong?

Grade 5. Manufactured from medium carbon steel and hardened for greater strength and durability, a grade 5 bolt is distinguished by 3 radial lines and promises tensile strengths between 105,000 and 120,000 psi.

Is Grade 8 or 8.8 stronger?

Synopsis: The similarity in names is purely coincidental and the Metric Class 8.8 is not as strong as the Inch Grade 8. As you can see from the table below, a metric Class 8.8 is the equivalent of a Grade 5, not a Grade 8.

What does 8.8 mean on a bolt head?

So a Property Class 8.8 bolt or screw is a medium-strength fastener that's roughly the same strength as an SAE J429 Grade 5 fastener.

Is Grade 8 A+?

Is Grade 8 an A or A *? It is an A* grade as Grade 9 is considered higher than 8 and is similar to getting a Distinction.

Is Grade 8 stronger than Grade 9?

Grade 9 bolts are stronger than Grade 8 bolts, which have a minimum tensile strength of 150,000 psi, and are typically used in high-stress and high-temperature applications. They are also resistant to corrosion and can withstand extreme environmental conditions.

What does Grade 8 mean in the UK?

| Grade 8 is equivalent to a high Grade A. | Grade 9 is equivalent to higher than a Grade A*. These are the top grades. Grade 9 is the highest grade possible, and is awarded to students for exceptional exam performance — if you get one, well done you!

How strong is Grade 8?

High strength: With a minimum tensile strength of 150,000 psi, Grade 8 fasteners are much stronger than most other fasteners on the market. This makes them suitable for use in applications where high loads or forces are present.

Does Grade 8 rust?

Alloy steel is made from high-strength steel alloy, heat-treated, so that would be the grade eight. These are all alloys. Grade 8 is heat treated. These, over-time, just so you know, have a zinc finish on them and they do not have any long-lasting rust resistance at all.

Which is stronger 8.8 or Grade 5?

However, as you can see in the following table, both tension and shear are higher in Grade 8 bolts over Grade 5 bolts; in fact over 21% higher in shear and 25% in tension. The same is true in metric when comparing 8.8 vs 10.9.

What is the toughest grade bolt?

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. This grade of bolt is made from low or medium carbon steel.

Are Grade 8 bolts structural?

ASTM A325 bolts are heavy hex structural bolts and used in structural steel connections, while SAE grade 8 bolts are finished hex bolts and typically used in automotive and equipment applications. By nature, an SAE bolt is also a more precision fastener with tighter tolerances than an ASTM bolt.

What grade is the weakest bolt?

SAE J429 Grade 2 – For bolts made of low- to medium-strength carbon steel, this is the SAE J429 grade that requires the least amount of strength, between 60,000-74,000 psi. Therefore, these bolts are used for non-critical joints and applications.

Are higher grade bolts more brittle?

2) The material must be susceptible - generally the higher the tensile strength/hardness of the fastener, the greater is the risk from this type of brittle fracture.

Are 8.8 bolts strong?

Typically Grade 8.8 to Grade 12.9 Steel

Screws and bolts made from high tensile steel can withstand high levels of strain without losing their strength or structure.