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 there a harder bolt than Grade 8?

Grade 9 bolts are ideal for heavy-duty applications and are also often used in heavy machinery such as bulldozers. Not only are these bolts considerably stronger than they're grade 8 counterparts, but they are also considerably more resistant to corrosive elements as they are made with yellow zinc chromate.

Are there Grade 10 bolts?

Bolt Grade Numbers

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, the higher number means the stronger the bolt.

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.

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.

Strongest Bolt? Grades Explained & Dyno Tested For Science

Do Grade 8 bolts break easily?

Grade 8 has a higher tensile strength and higher yield strength than grade 5 and lower bolts, but that doesn't mean it is good enough for all locations.

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.

What is the strongest grade 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.

Are socket head cap screws stronger than Grade 8?

Standard inch series socket head screws are 20 percent stronger than a Grade 8 hex head screw and 50 percent stronger than a Grade 5 hex screw. The tensile strength is a minimum of 180,000 psi for sizes 1/2′ diameter and smaller and 170,000 psi for 5/8′ diameter and above.

Why use Grade 8 bolts?

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.

What grade is black bolts?

Grade 8 Black Oxide Steel Flange Bolts PT 3/8"-16 x 1.75" Length 25 Pcs.

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.

What nut for Grade 8 bolt?

Grade 8 hex nuts are commonly used on Grade 8 bolts.

How much force does it take to break a Grade 8 bolt?

21+ years working for fasteners, with ISO 9001…

The tensile strength of a grade 8 bolt is 150,000 pounds per square inch. It is the maximum strength that a part can carry without breaking.

What is the Rockwell hardness of a Grade 8 bolt?

Grade 8 typically has a core Rockwell hardness of C33-C39, while Grade 5 have a core Rockwell hardness of C25-C34.

Will Grade 8 bolts rust?

Black oxide is in fact a controlled chemical oxidation process that equates to black rust. If you ever buy grade 8 bolts or screws that are black oxided, you will notice that they are often oil coated. This is to prevent them from rusting! So yes, they will rust.

Are Grade 8 bolts hard to drill?

Grade 8 bolts are softer than Rc 40 and normally present no problem in drilling. Drill thru with a 1/8" drill first to lessen the required thrust on the larger drill. I'd use 135* split points for all drilling. Cobalt wouldn't hurt if you have them handy, but HSS should work fine.

What does the top of a Grade 8 bolt look like?

English bolts have radial lines on their head to identify the grade, or strength class. The number of lines on the bolt head is 2 less than the actual grade. So, for example, a grade 5 bolt will only have 3 radial lines on its head. A grade 8 bolt will have 6 radial lines on its head.

Are all socket head bolts Grade 8?

Socket head cap screws are not grade designated as are hex head cap screws. A standard inch series socket head cap screw is 20% stronger than a Grade 8 hex head cap screw and 50% stronger than a Grade 5 hex cap screw.

What is the hardest bolt to break?

Steel fasteners are commonly available in four grades that are broken into the following categories: 2, 5, 8 and 18-8 stainless (commonly referred to simply as alloy steel). Grade 8 is the hardest, Grade 5 is medium, and Grade 2 is the softest.

How much weight can a Grade 8 bolt hold?

No problem ,Think about the pin in a clevis hook on a 5/16 chain . Not sure exactly how the bolt will be loaded in your situation but a single 5/16" grade 8 bolt will basically live forever with a maximum load in tension of 4300# or if it is loaded in shear it would only be good for about 870#.

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.

Will welding Grade 8 bolt weaken it?

If you weld a Grade 8 bolt, you could soften it to the strength that Grade 5 possesses. No matter how little heat you use, heating the bolt in uncontrolled conditions will weaken it.

Which is stronger Grade 8 or stainless steel?

Moreover, the minimum strength of grade 8 bolts is around 130,000 psi, whereas stainless steel strength doesn't exceed 90,000 psi. Depending on the particular use, industry as well as the amount of stress and heavy loads it needs to bear, the super strong fastener is available in a wide variety of lengths.