Question: What Is A 12.9 Grade Bolts?

How hard is a 10.9 bolt?

Used in automotive applications and for bolting large and forged parts, metric 10.9 bolts exhibit high tensile strength and good wear resistance.

Our metric grade 10.9 bolts meet ASTM A324 grade BD and SAE J429, grade 8 standards.

The yield strength of the bolts is 940 and the tensile strength is 1040 MPa..

How strong is a grade 12.9 bolt?

The minimum ultimate tensile strength of the Grade 12.9 Metric Hex Head Bolts is about 1242 Mpa or 180,000 PSI, making them the highest grade of bolts produced.In fact, the Grade 12.9 Nuts is known for their high tensile strength.

Are higher grade bolts more brittle?

One common misconception about bolts is that a higher rated bolt is stronger, yet more brittle, and therefore lower grades should be used in places like in suspension systems so they can deform rather then break. This is wrong! There are two types of forces a bolt experiences, tension and shear.

What are the different grades of bolts?

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 to grade the bolts, the higher the number means the stronger the bolt.

What is the difference between a 10.9 and 12.9 Bolt?

12.9 grade steel has 120% of the tensile strength of 10.9 grade steel. The “12” prefix indicates a tensile strength of X100 N/mm^2 and the “9” suffix indicates a multiplier. Both 12.9 and 10.9 have the same multiplier, so the comparison is straightforward: 12 to 10.

Is a 10.9 Bolt stronger than Grade 8?

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. A low carbon steel for general use.

What is the hardest bolt you can buy?

BUMAX® Ultra has proven itself as the world’s strongest bolt – in various highly-demanding critical fastener applications around the world where standard fasteners are simply inadequate.

Is a Grade 5 or Grade 8 bolt stronger?

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.

Are stainless steel bolts stronger than Grade 8?

Stainless steel bolts are rated for corrosion resistance. Bolt strength is rated in PSI (pounds per square inch). 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.

How strong is a Grade 5 bolt?

Bolt Grade Markings and Strength ChartHead MarkingGrade and MaterialMechanical PropertiesMin. Tensile Strength (psi)3 Radial LinesGrade 5 Medium carbon steel, quenched and tempered120,000105,0006 Radial LinesGrade 8 Medium carbon alloy steel, quenched and tempered150,00018 more rows

What is the difference between 8.8 and 12.9 grade bolts?

The mechanical difference between the 12.9 and 8.8 is yield strength (roughly 90% of 1200 MPa vs 80% of 800 MPa). That means the 12.9 can be stretched further (i.e. torqued to some higher value) before it yields, which of course increases the clamp force.

How strong is a grade 8.8 bolt?

Mechanical propertiesGrade, material & conditionNominal thread diameter size range [mm]Tensile strength (min) [MPa]Class 5.8 Low or medium carbon steel; cold worked5–24520Class 8.8 Medium carbon steel; quench and temperedUnder 16 (inc.)80017–72830Class 8.8 low carbon Low carbon boron steel; quench and tempered9 more rows

What are 12.9 bolts made of?

The standard was withdrawn in 2012. The 12.9 is the Class head marking under ASTM F568M standard for Bolts of a high grade (1220 MPa), being Alloy steel, quenched and tempered. ASTM F568M is an ASTM International standard for metric bolts, screws and studs that are used in general engineering applications.

What is the strongest bolt grade?

grade 8The 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.