Is a 10.9 bolt the same as Grade 8?

Class 10.9 This is a metric grading similar to the SAE grade 8 classification, which is used in automotive, and structural industries, as well as in high temp applications. Its strength is near the high end of the grade scale, although there are higher grades and strengths for more specialized fasteners.

Are 10.9 bolts stronger than Grade 8?

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

What does 10.9 mean on a bolt?

Grade 10.9 bolts: As these bolts are most often used in the automotive industry, they are also referred to as 'car bolts'. They are made of boron or carbon steel and have high tensile strength (1040 MPa).

Is Grade 8 or 10 bolt stronger?

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.

What is a Grade 8 bolt equivalent to?

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. The A325 bolt strength, or SAE grade 5 bolt strength, is usually used for structural bolting projects.

Bolt grade explained

What is a 10.9 grade equivalent to?

Class 10.9

This is a metric grading similar to the SAE grade 8 classification, which is used in automotive, and structural industries, as well as in high temp applications. Its strength is near the high end of the grade scale, although there are higher grades and strengths for more specialized fasteners.

What is equivalent to Grade 8?

Grade G is roughly equivalent to Grade 8. Grade G nuts are used with Grade 8 bolts.

How strong is a 10.9 bolt?

The High Tensile Grade 10.9 Screw is a special type that does not need nuts to fix it onto other components. This grade of bolts have tensile strength upto 1040 minimum and yield strength up to 940MPa minimum. The Grade 10.9 Stainless Steel Bolt Material Properties make them applicable in engine parts and components.

Are 10.9 bolts brittle?

For most applications, property class 10.9 fasteners gives the best compromise between strength and brittle fracture risk.

Is a 10.9 bolt hardened?

Hardened Class 10.9 Metric Hex Bolts are a high strength, high tensile fastening solution available in coarse, fine and extra fine thread. One of the most commonly used fasteners, our Class 10.9 hexagonal bolts include DIN 933/961 Full and DIN 931/960 Partial thread options.

Why are 10.9 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.

Will Grade 10.9 bolts rust?

These Carbon Steel 10.9 Bolts are also resistant to corrosion and therefore are used in a wide range of industrial applications such as for construction. These fasteners also have excellent finishing and are easy to install, and are also robust.

Is 10.9 steel good?

Grade 10.9 steel: Fasteners made from a grade 10.9 consist of a higher strength alloy steel and which has a tensile strength of 1000 MPa. The highest, most common strength carbon steel available. This grade of steel is required for high strength and reliability projects.

Is Grade 8.8 better than Grade 8?

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.

Are Grade 8 bolts brittle?

Brittleness: Grade 8 fasteners are made of high-strength alloy steel and are heat-treated to increase their strength. However, this heat-treatment process can also make them more brittle, which can increase the risk of fastener failure if they are subjected to too much stress or strain.

What nut to use with 10.9 bolt?

High tensile bolts are usually graded 10.9 and 12.9 (these are popular varieties) and you can match a grade 10 nut and grade 12 nut with these units respectively. You can, however, replace lower grade nuts with higher grade ones without fear of breakage and thread stripping.

How much torque can a 10.9 bolt hold?

Did you know an M12 grade 10.9 bolt, a common automotive fastener, has an ultimate tensile strength of nearly 20,000 pounds? According to the chart above, the recommended tightening torque for an M12 bolt with a 10.9 bolt grade would be 114.0 Nm.

Can you weld 10.9 bolts?

If you take a heat treated bolt, such as an SAE Grade 5 or 8, or metric 8.8 or 10.9, and weld on it, you've changed the heat treatment, so you have no idea of the new strength. In addition, there may be residual stresses that could contribute to the stress in the bolt.

What is the strongest grade bolt you can buy?

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.

How much weight can a Grade 10.9 bolt hold?

From the table at right, for a strength class of 10.9 and a maximum allowable load of 200 kgf, the suitable bolt is a 318［kgf］M8.

What bolts won't rust?

There are many advantages to choosing a fastener made of stainless steel. The benefits include: Resistance to rusting and corrosion: If you want screws that won't rust, stainless steel is your ideal material. The steel mixed with the metal compounds prevents the steel from rust or corrosion.

Are all Grade 8 bolts the same?

Grade 8 bolts are manufactured in different materials, thread types, lengths, coatings, and classes of fit, so it is critical that all those factors are taken into account when choosing the type of Grade 8 bolt is best.

Is a 10.9 bolt metric or standard?

Metric Bolt Head Markings

Common metric classes are 5.8, 8.8, 10.9, and 12.9.