What does 12.9 mean?

The number 12.9 indicates the tensile strength of the steel in units of hundreds of megapascals (MPa). In this case, the "12" represents a tensile strength of approximately 1200 MPa. The "9" represents the ratio of the yield strength to the tensile strength.

What does 12.9 grade mean?

In metric classes, bolts that have been graded as 12.9 have the highest strength. In comparison to grade 8.8, the strength of Grade 12.9 Bolts is very high, where their minimum ultimate tensile strength is valued as high as 1242 Mpa. These fasteners are renowned for having a high tensile strength.

What is the strength of a 12.9 bolt?

Grade 12.9 Bolts

It has a minimum tensile strength of 1220 MPa.

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 12.9 bolt mark?

Property Class 12.9 bolts and screws have a minimum tensile strength of 1220 MPa for all sizes. 1220 MPa are roughly equivalent to 175 ksi. These parts are very high in strength. In fact, they're the strongest of all the fasteners we've covered in our inch-series and metric bolt head marking blogs.

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Is 12.9 The Strongest bolt?

Grade 12.9 bolts: Known for their strength, these bolts are most often used in the manufacturing and construction industries to join medium or heavy industrial parts such as an automotive engine. Grade 14.9 bolts: It's simple: these are the most durable bolts you can use in your application.

What is the steel grade 12.9 equivalent to?

Similarly, grade 12.9, where as common in metric circles, has as its only ASTM mechanical equivalent, A574. A574, however, is a socket head cap screw standard, so studs and hex bolts are left out and do not have a direct equivalent.

Are 12.9 bolts brittle?

12.9 bolts have a high ultimate tensile strength but a low ductility (they're more brittle). If they're plated they're also much more prone to hydrogen embrittlement.

What is the strongest bolt grade?

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 12.9 high tensile?

Grade 12.9 Hex Bolts are high strength bolts with 1100MPa minimum yield strength and 1220MPa minimum tensile strength. Suraj Metal Corporation is a leading manufacturer and supplier of the different types such as the Grade 12.9 Hex Head Bolts and others.

Why are 12.9 bolts black?

Hydrogen embrittlement is likely to occur after electro-galvanizing after tightening, so bolts above 10.9 are usually not galvanized, and the surface treatment is usually blackened or hot-dip galvanized.

Does 12.9 steel rust?

These Carbon Steel 12.9 Bolts prove all of their properties even in harsh environments. These are also resistant to corrosion and are easy to install. These Carbon Steel 12.9 Bolts are durable and also serve for a long time.

What is the strength of 12.9 steel?

12.9 grade steel means that a component manufactured form this grade of steel has 12X100 N/mm^2 tensile strength and 9 is a multiplier means 90% of 1200 = 1080 N/mm^2 is the yield strength of the grade. Similarly we also have grade 8.8 , 10.9 , 6.8 also.

What is the difference between a 10.9 and 12.9 bolt?

Tensile strength of a bolt is the amount of force a bolt can withstand when it is being stretched without being deformed. Yield strength is the maximum load without permanent deformation. A 12.9 has a rating of about 175000 to 180000 psi tensile strength and is about 20-25% stronger than 10.9.

What material are 12.9 bolts made from?

Grade 12.9 bolts are made from alloy steel that has been quenched and tempered, resulting in a high-strength bolt that can withstand high stress and strain.

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.

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.

What is the difference between Grade 8.8 and 12.9 bolts?

Next comes grade 8.8, known as structural grade, and finally, the highest grade is 12.9, known as high tensile bolts. The first number represents the ultimate tensile strength of the bolt, 400 MPa, 800 MPa or 1200 MPa respectively. The second number represents the point at which the bolt will permanently stretch.

What temperature is a 12.9 bolt?

Your standard off-the-shelf 12.9 can be used, but it is important to remember that the 12.9 is limited to a specific range between -10 Degrees C and 250 Degrees C. Low carbon steel or low ally steel can be used up to a ceiling of about 350 Degrees C (660 Degrees F).

What is the most popular steel grade?

Carbon steels are the most common of the four steel grades, accounting for 90% of total steel production! Carbon steel is classified into three subgroups based on the amount of carbon in the metal: Low carbon steels/mild steels (up to 0.3% carbon)

Which grade of steel is the strongest?

High carbon steel is also known as “carbon tool steel,” the strongest carbon steel out there you can buy is also, as expected, the most inflexible. High carbon steel has more carbon than the other two types (between 0.60% and 1.4%), yet it too can accept alloys in order to change its properties.

What is the hardest grade steel 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.

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.

Why are bolts black?

Black oxide is most commonly added to stainless steel nuts and bolts for aesthetic reasons, meaning a customer wants the benefits of stainless steel fasteners for their corrosion resistance, but desires a black product. Black oxide is a conversion coating process between the oxidizing salts used and the material.

Why use black bolts?

Chemical blackening is often used on fasteners made from stainless steel, copper, copper based alloys and zinc. Benefits of the process include the addition of mild corrosion resistance, improves aesthetic appearance and the minimising of light reflection.