What are Grade 8 bolts used for?
Where are Grade 8 Bolts Used? Common uses for grade 8 bolts are for military, aerospace, or marine related mechanical applications where high stress and strong load bearing pressures are a major factor. The off road vehicle market also has a need for grade 8 bolts for the same reasons.
Are there bolts stronger than Grade 8?
Bolts in Grades 8 and 8 have been hardened more than bolts in Grades 5 and 5. As a result, they are more durable and are employed in high-demand applications like car suspensions. On the head of Grade 8 bolts, there are six equally spaced radial lines.
What grade bolt should I use?
Use a grade 5. Grade 8's provide the strongest clamping force available. But they are not as good in shear; especially in single shear. Where a grade 5 would flex, bend and distort, the 8 would fracture. Aha! See, that was what I was curious about.
What type of steel is a Grade 8 bolt?
The strongest commercial-quality bolt is grade 8, marked by six raised dashes; its medium-carbon alloy steel has been quenched and tempered to achieve a tensile strength of 150,000 psi. Additionally, what type of steel is a Grade 8 bolt? Grade 8 bolts are comprised of carbon alloy steel, thus giving them a high psi rating.
Is grade 8 bolt the strongest?
The strongest commercial-quality bolt is grade 8, marked by six raised dashes; its medium-carbon alloy steel has been quenched and tempered to achieve a tensile strength of 150,000 psi.
What is a grade 8 bolt good for?
Grade 8 bolts have the highest ratings with tensile strength of 150,000 psi. Grade 8 bolts are used marine, military, aerospace, off-road vehicle markets and related mechanical applications where stress and strong load bearing pressure is required.
Is Grade 8 or 8.8 Stronger?
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.
How much stronger is a grade 8 bolt?
Its medium-carbon alloy steel has been quenched and tempered, ultimately making it possible to achieve an impressive tensile strength of 150,000 psi, compared to a grade 2 bolt's 64,000 psi. In other words, a grade 8 bolt is more than twice as strong as a grade 2 SAE American Grade bolt.
What grade bolt is the strongest?
grade 8Grade 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 Grade 5 or 8 better?
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. Grade 8 bolts have 6 evenly spaced radial lines on the head. Grade G is roughly equivalent to Grade 8.
Is there a grade 10 bolt?
Class 10. This is a metric nut grading similar to the SAE grade 8 classification, which is used in conjunction with Class 10.9 bolts. This strength of nut is used in automotive, and structural industries, as well as in high temp applications.
Is Grade 8 or 10.9 stronger?
Class 10.9 is stronger than class 8.8. It is commonly found in high strength automotive applications. Class 10.9 is similar to grade 8.
Are stainless bolts stronger than Grade 8?
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.
How can you tell if a bolt is grade 8?
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.
What is the yellow coating on Grade 8 bolts?
zinc yellow-chromate plated finishThe grade 8 steel hex bolt has a zinc yellow-chromate plated finish and an external hex drive, and meets American Society of Mechanical Engineers ASME B18.
What is the best bolt for shear strength?
Grade 8 bolts exhibit greater tensile, yield, and shear strength as well as greater fatigue resistance and, just as important, are capable of greater torque specs and therefore much greater pre-load and clamping strength.
Which is stronger Grade 8 or Grade 10 bolt?
No matter the system used to grade the bolts, 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 a grade 8 bolt 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 grade bolt is best for shear strength?
Grade 8 bolts exhibit greater tensile, yield, and shear strength as well as greater fatigue resistance and, just as important, are capable of greater torque specs and therefore much greater pre-load and clamping strength.
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.
What is a grade 8 bolt?
Grade 8 bolts are specified for high strength applications and are commonly used in heavy manufacturing, such as tractor and truck fabrication for instance. The bolts are typically made of a medium carbon alloy steel that is plated in zinc for extra resilience. The grade 8 bolt can be identified via the flat, hexagonal head marked by six radial ...
How to identify a grade 8 bolt?
In the event that you need to replace a fastener on one of the machines and you suspect it's a grade 8 bolt, then all you need to do is check out the marking on the head of the bolt. As dictated by the industry standards, a grade 8 bolt will have six lines stamped into the head that point towards its center.
Can you read a rusted bolt?
If the bolt you're trying to identify is old and rusted, then there's a chance you can't read the markings. In this case, the ideal approach would be to search for the type of fasteners needed in the equipment's manual. In the event this is not an option, then your best bet is to make an educated guess by accounting for the settings of the old bolt and the typically load it supported.
Is stainless steel a grade 8 bolt?
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 does grade mean on a bolt?
This is a technical term which determines the properties of a bolt. The grade of a bolt determines the maximum amount of stress that the bolt can handle.
What are the different grades of bolts?
Let us have a look at each grade and its properties: Grade 2 – The grade 2 bolts are most commonly manufactured from low or medium carbon steel.
What are bolts used for?
Bolts. What are they? These are the components which are also referred to as fasteners and are used to hold two objects firmly together. There are certain things that are very crucial to consider while selecting the right bolt for an application.
What makes a grade 8 bolt different from a grade 8 bolt?
The factor that makes a grade 8 bolt different from a lower grade bolt is its preload strength. Higher grade materials, such as carbon alloy steel, allow for greater torque strength in the threads of the bolt. The preload, or thread tension in a fastener is higher when the type of steel being used is grade 8 in quality.
What is the strength of a grade 8 bolt?
It is made of alloy steel and has six radial lines on the top of the bolt head. Grade 8 bolts have a tensile strength of 150,000 pounds per square inch.
What grade bolts are needed for off road?
The off road vehicle market also has a need for grade 8 bolts for the same reasons. One thing to keep in mind is that it's almost always a safe bet to go with the highest grade of bolt you can when in doubt. Manufacturers may recommend a grade 5 but it never hurts to go with higher quality materials. The worst that can happen is that you paid ...
Bolt Grades Explained
The performance grades of bolts for steel structure connection are divided into more than 10 grades, such as 3.6, 8.8, and 12.9.
Bolt Grades Chart - Metric Bolt Grades & Strength Chart
Below is a metric bolt grades chart that is used to identify the bolt head markings and their mechanical properties including strength and hardness.
Grade 2
A grade 2 bolt is distinguished through its complete lack of markings and will usually have a tensile strength of between 60,000 and 74,000 psi. Depending on the application they are used for, the Grade 2 bolts can be partially or completely threaded.
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. They are most commonly found in automotive applications or those that require medium strength.
Grade 8
The high-strength, sought-after grade 8 bolt can be distinguished by six raised dashes. Its medium-carbon alloy steel has been quenched and tempered, ultimately making it possible to achieve an impressive tensile strength of 150,000 psi, compared to a grade 2 bolt’s 64,000 psi.
Grade S
The heavy-duty grade S bolts are built for strength and durability. They are engineered to withstand stresses ranging from 45 to 49.9 MT per 6.45 cm3.
How many radial lines are there on a grade 8 bolt?
A grade 8 bolt will have 6 radial lines on its head. Metric bolts are a bit more straight forward, usually having their strength class number stamped right on the bolt head. Some metric nuts also have the strength class number stamped on their face. The below diagram shows examples of English and Metric bolt and nut markings.
How to tell the strength of a bolt?
You can usually figure out the grade, or strength, of a bolt by looking at the markings on its head. English bolts (U.S.S. or S.A.E) are categorized by grade, from grade 2 to grade 8, where the grade represents inch strength. The higher the grade, the stronger the bolt. English bolts have radial lines on their head to identify the grade, ...
Why do English bolts have radial lines?
The higher the grade, the stronger the bolt. 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.
What is yield strength?
Yield Strength is the maximum load at which a material exhibits a specific permanent deformation.
What Do Screw and Bolt Head Markings Mean?
Screw and bolt head markings identify the manufacturer of the fastener and the standard to which the fastener was made. Below, we’ll explore both of those concepts, then connect them together with a few examples.
Examples of Screw and Bolt Head Markings & What They Mean
Now let’s put all this information together. We’ll do so by returning back to SAE J429, a standard established by The Society of Automotive Engineers (SAE). In a nutshell, this standard lays out mechanical and material requirements for inch bolts, screws, studs, sems, and U-bolts in sizes up to 1-½” in diameter.
Learn More About Screw & Bolt Head Markings with Wilson-Garner
Interested in learning a bit more about screw and bolt head markings? We talk about three additional standards that deal with inch-series fasteners in this blog. Or, we also talk about some metric head markings in this blog. Check them out.
What is a grade 8 bolt?from doityourself.com
These bolts are the strongest and most durable bolt fasteners ever made. They are used in high-stress applications, such as valves, pumps, motors, automotive suspension systems, aerospace, military, marine, and heavy construction projects. Grade 8 bolts have a high tensile strength rating due to its medium-carbon alloy steel composition ...
What do you need for a bolt?from doityourself.com
Bolts. What You'll Need. Magnet. Wire brush. Bolts. Bolts are composed of different grades of steel, the greater the tensile strength of the steel, the more torque the bolt can withstand, and the more secure the bolted joint is going to be.
What is proof load?from aftfasteners.com
Proof Load: An axial tensile load which the product must stand without evidence of any permanent set.
Can you read a rusted bolt?from melfast.com
If the bolt you're trying to identify is old and rusted, then there's a chance you can't read the markings. In this case, the ideal approach would be to search for the type of fasteners needed in the equipment's manual. In the event this is not an option, then your best bet is to make an educated guess by accounting for the settings of the old bolt and the typically load it supported.
Is stainless steel a grade 8 bolt?from melfast.com
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.