8. 8 is a common designation for a type of bolt referred to as a Class 8. 8 bolt. This particular class of bolt is made of medium carbon steel and is heat treated. It is considered to be a medium-strength bolt and is commonly used in applications that require a balanced combination of strength and toughness.
The 8. 8 classification actually refers to the tensile strength of a specific bolt, which is roughly equal to 880 MPa or 128000 psi. In comparison, grade 2 bolts typically have a tensile strength of only around 74 MPa or 1o8,000 psi while grade 5 bolts can have a tensile strength of up to 1220 MPa or 176,000 psi.
The 8. 8 designation is also sometimes written as ‘GR 8. 8’. This notation typically precedes the size, length and head design of the bolt.
Table of Contents
Is Grade 8 or 8.8 stronger?
Grade 8 or 8. 8 is a steel fastening grade that has different properties and strength when compared to each other. Grade 8 or 8. 8 is an alloy steel that has been heat treated and quenched. It is typically used in industrial applications and is very hard and strong.
Grade 8 has a tensile strength of 150,000 psi (how much force is required to pull it apart) and a minimum yield strength of 120,000 psi (the amount of pressure it takes to make it bend. It is also considered a low or medium carbon steel and has a Rockwell hardness of 33-39.
Grade 8. 8 is a higher grade of steel and has a tensile strength of 150,000-180,000 psi, a yield strength of 135,000-180,000 psi, and a Rockwell hardness of 40-51. It is used in more demanding applications, such as in the construction of machinery, buildings, bridges, and heavy-duty equipment.
Grade 8. 8 is also considered a medium carbon steel with a higher strength than grade 8.
Overall, grade 8. 8 is stronger than grade 8, due to its higher tensile and yield strength, as well as its higher hardness. Grade 8. 8 is the better choice for applications that require higher wear and tear resistance.
However, grade 8 is still a viable option for applications with lower strength requirements such as non-load bearing applications.
Is Grade 8.8 the same as Grade 8?
No, Grade 8. 8 is not the same as Grade 8. Grade 8 refers to a grade of steel that consists of a variety of alloy components and has a minimum tensile strength of 80,000 psi. It is also known as AISI (American Iron and Steel Institute) Grade 8.
Grade 8. 8, on the other hand, is a higher grade steel which is also termed as high tensile steel and has a higher minimum tensile strength of at least 800 N/mm2, or 830-930 MPa. Additionally, Grade 8.
8 is manufactured in accordance with the British Standard (BS) and also is known as a metric grade bolt.
What grade is an 8.8 bolt?
An 8. 8 grade bolt is a medium carbon steel bolt with a diameter of 8 millimeters and is manufactured to a property class of 8. 8. It is made from medium carbon steel, quenched and tempered, with the mechanical properties conforming to the requirements of ISO 898-1:2009.
This grade 8. 8 bolt has a minimum tensile strength of 800MPa and, depending on the diameter of the bolt, a minimum yield strength of 640MPa. It is predominantly used in high tensile applications such as suspension components and other static, heavy duty applications.
The ISO 898-1:2009 grade 8. 8 bolt is generally considered to be “high grade” and is often used in applications that require strength, durability and stability.
What is grade 8.8 equivalent to?
Grade 8. 8 is a fastener grade and it is metric grade for bolts, screws and studs. Grade 8. 8 fasteners are made from medium carbon steel and have a strength of 800 – 900 MPa. This grade is particularly popular for mechanical and structural applications and is known for providing strong tensile strength and high resistance to shock and impact.
Grade 8. 8 fasteners have a minimum proof load of 80 kN/m2 and a minimum tensile strength of 800 MPa, making them suitable for many general purpose applications. In terms of US grades, grade 8. 8 is equivalent to an AISI grade 5 bolt.
Grade 8. 8 fasteners should be used with compatible nuts and washers of the same material grade and should be tightened to the recommended torque settings. Grade 8. 8 fasteners offer superior strength, making them suitable for a variety of construction, engineering and industrial applications.
Are Grade 8 bolts the strongest?
No, Grade 8 bolts are not the strongest bolts available. Grade 8 bolts have a tensile strength of 150,000 psi which is considered to be strong, however, there are higher grades available that boast a higher strength rating.
Grade 9 bolts have a tensile strength of 180,000 psi and Grade 10. 9 bolts have a tensile strength of up to 400,000 psi. Additionally, some specialty graded bolts can have even higher strength ratings.
These specialty grade bolts are not necessarily made from a different material, but are the result of a different manufacturing process or added heat treatment. It is also important to consider the material of the bolt when considering how strong it is.
For example, stainless steel bolts can have higher tensile strength ratings than comparable carbon steel bolts of the same grade.
How strong is a 8.8 bolt?
A grade 8. 8 bolt is made of medium carbon steel with a tensile strength of 800-1000MPa. This bolt is known for its good strength and has a higher tensile strength than the weaker grades such as 4. 6 and 5.
8. It is typically used for flanged joints, splices, and other applications that require strong but non-critical fastening. The yield strength of a grade 8. 8 bolt is about 638MPa, which is a measure of how much force is needed to cause permanent deformation.
The maximum stress is reached at a preload of about 574MPa, so this bolt can easily handle large forces. Grade 8. 8 bolts are not ideal for critical or safety-related applications because they have lower fatigue strengths and ductility than higher grades.
However, they are well suited for automotive, construction, and general engineering applications.
Is there a Grade 9 bolt?
Yes, there is a Grade 9 bolt. Grade 9 bolts are made from medium carbon alloy steel and are heat-treated to produce high strength. Grade 9 bolts are usually marked with a 9 or 577 on the head. These bolts are commonly used in high-strength structural and mechanical applications and are designed for applications that require a strong clamp load, such as suspension and engine components.
Grade 9 bolts are typically used in areas that require a more secure hold and are more resistant to vibration and can even be used for rigging applications. Since Grade 9 bolts are very strong, they are often more expensive than lower strength grades.
However, their strength and durability make them a great choice for many applications.
How hard is it to break a Grade 8 bolt?
It depends on a variety of different factors, such as the type of bolts, the strength of the bolt material, and the environment or application in which the bolt is being used. Grade 8 bolts have a higher tensile strength and are made from alloy steel, so the bolts could be harder to break than other weaker grades of bolts.
Additionally, depending on the application, the environment the bolt is being used in can also increase or decrease the difficulty in breaking the bolt. For example, if the bolt is exposed to heat, corrosion, vibration, or shock, it may be easier to break than a bolt that is used in an environment where these forces do not exist.
What’s the strongest grade of bolt?
The strongest grade of bolts are typically graded by their strength and are designated by three different systems: U. S. customary sizes, metric sizes and ASTM International standards. The strongest grade of bolts are typically made from alloy steel and are heat-treated to obtain the desired strength.
The grade can be identified by the first two (#) of the three-digit number that designate the specific alloy and its mechanical properties.
The strongest grade of bolts available is typically grade 8. Bolts of this grade are made of alloy steel with a minimum tensile strength of 150,000 psi. The term “grade 8” is not to be confused with the “8” that is stamped into the head of an SAE Grade 5 or 8 bolt, which indicates its strength rating on a 1-8 scale.
The number “8” stamped onto the head of a bolt indicates a minimum tensile strength of 120,000 psi.
In metric applications, the strongest grade bolt available is typically a 10.9 grade. A 10.9 grade bolt is made from alloy steel with a minimum tensile strength of 830 MPa.
Finally, ASTM International standards designate the highest grade of bolts to be a A325. Bolts of this grade are made with a minimum tensile strength of 120,000 psi, and are often used in projects with high-tension requirements.
How much weight can a 8.8 bolt hold?
The amount of weight that a 8. 8 bolt can hold depends on a variety of factors, including the type of material it is made of, the type of surface it is mounted on, and the space that it has to expand into.
In general, however, a 8. 8 grade bolt is successful in holding around 200,000 psi or 130,000 Newton of tensile strength. This can translate to a holding capacity of around 800 to 900 pounds, which is more than enough for holding most items in place.
To further ensure the bolt does not fail, however, it is important to install the nut with threadlocker or with a helical tensioning device.
What are grade 8.8 bolts used for?
Grade 8. 8 bolts are one of the most common types of bolts used in a variety of applications. They are made of medium carbon steel and are heat treated to increase their hardness and tensile strength.
As such, they are an ideal choice for installing and fastening components and structures at all levels of strength.
Grade 8. 8 bolts offer a high degree of strength and can be used in a wide range of applications, from furniture and light fixtures, to bridges and other structures. They are also used in aircraft, automotive and marine engineering applications, where they are ideal for bolting and fastening components with long-term efficacy.
Grade 8. 8 bolts also offer superior corrosion resistance and are perfect for outdoor applications.
Grade 8. 8 bolts are also often used in pipe and flange applications, particularly in the oil and gas industry. They are commonly used to attach fittings and pipes, as well as for connecting supports, flanges, and anchors.
Additionally, they are a great choice for general construction applications where the highest levels of strength are desired.
All in all, Grade 8. 8 bolts are an excellent choice for a variety of applications. Not only do they offer high levels of strength, but they also boast superior corrosion resistance and are suitable for a broad range of uses.
What is the difference between 10.9 and 8.8 bolts?
The difference between 10. 9 and 8. 8 bolts is their metric classification, which is officially known as the property class. 10. 9 bolts are classified as property class 10. 9, whereas 8. 8 bolts are classified as property class 8.
8. The higher the number, the stronger the bolt. This means that 10. 9 bolts have higher tensile strength, yield strength, and proof load than 8. 8 bolts. The higher hardness of 10. 9 bolts also means they are more resistant to wear and tear, while 8.
8 bolts are suitable for applications that don’t require such high demands. Additionally, 8. 8 bolts may also be galvanized, while 10. 9 bolts are typically plain steel. This can be important for use in outdoor and marine applications, where corrosion resistance is essential.
In summary, 10.9 bolts are stronger, harder, and more resistant to wear and tear than 8.8 bolts, making them ideal for heavy duty applications.
What is Class 8.8 and 10.9 bolts?
Class 8. 8 and 10. 9 bolts are two different classes of bolts that are used for different applications in engineering. The first number in the classification (8. 8 and 10. 9) refers to the tensile strength of the bolt and is measured in megapascals (MPa).
The 8. 8 class bolt has a minimum tensile strength of 800MPa, while the 10. 9 class bolt has a minimum tensile strength of 1000MPa. This higher tensile strength of the 10. 9 class bolt makes it more suitable to withstand greater tensile stress, vibrations and shock loads.
The 8. 8 class bolt is suitable for general fastening in structural connections subject to relatively low stresses, such as plugging of tension parts or fixtures.
In addition to the bolting class, the bolt material is also specified. Generally, 8. 8 and 10. 9 class bolts are made from low- or medium-carbon steel with the addition of other alloying elements to add strength such as vanadium, chromium, and molybdenum.
There are also specialized 8. 8 and 10. 9 grade bolts available made from stainless steel, titanium, and other metals for applications with particular strength or corrosion resistance requirements.
Is 10.9 equivalent to Grade 8?
No, 10. 9 does not equate to Grade 8. Grade 8 is an educational qualification, while 10. 9 is an academic grade. Grade 8 is a secondary school qualification gaining a certain level of GCSEs. The 10. 9 is a numerical score out of 10 that might receive when sitting an examination or completing a piece of coursework.
The score is given to the student to signify their performance and is lower than a grade 8.
