Frequent question: What is the breaking strength of 1/2 Grade 8 bolt?

For example, a 1/2-inch grade 8 bolt with 13 threads per inch has an effective stress-carrying cross section of 0.1419 square inches, so its breaking load would be 0.1419 (area subject to stress) x 150,000 (tensile strength) = 21,285 pounds.

What is the breaking strength of a Grade 8 bolt?

Grade 8 bolts are designated as a 150 ksi. This means its tensile strength or the resistance it has before it is subject to breaking under tension is equal to 150,000 lbs. per square inch.

Are Grade 8 bolts the strongest?

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.

Can you break Grade 8 bolts?

Grade-8 bolts are difficult to cut, but can be done with the use of a high-speed cutoff wheel. … Put your safety glasses on and install the diamond cut-off wheel to the Dremel tool. Mark the bolt where you want to cut it and run a nut onto the threads of the bolt, past where you will cut.

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What is the hardest bolt to break?

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 the breaking strength of 1/2 Grade 8 bolt?

Determining the Load a Grade 8 Bolt Can Carry

For example, a 1/2-inch grade 8 bolt with 13 threads per inch has an effective stress-carrying cross section of 0.1419 square inches, so its breaking load would be 0.1419 (area subject to stress) x 150,000 (tensile strength) = 21,285 pounds.

Is Grade 8 or 12.9 stronger?

Special markings on screw heads and nuts identify the fastener’s grade. Replace a graded fastener with same or higher grade (don’t replace a Grade 8 fastener with a Grade 5 or 2).

Table 1.

Grade/Class Strength
Metric Class 12.9 The highest metric class for strength, it exceeds Grade 8.

Are Grade 8 bolts brittle?

Registered. The grade 8 will have a higher tensile strength but it’s more brittle and will snap before it bends.

How strong is a Grade 2 bolt?

Grade 2 hex head bolts are made from low to medium strength carbon steel and offer a tensile strength of 60,000 to 74,000 psi, depending on the diameter.

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. A low carbon steel for general use.

How much torque can a Grade 8 bolt take?

US Recommended Bolt Torque

Size Recommended Torque
Grade 2 Grade 8
7/8″ 129 454
1″† 188 682
* Sizes from #4 to #10 are in lb-in. Sizes from 1/4″ up are in lb-ft. † Fine thread figures are for 1″-14. Grade 2, 5, and 8 values are for slightly lubricated bolts.
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What is tensile strength for bolts?

Tensile strength is the amount of pull the bolt can withstand before breaking. The method used for tightening the bolt is also dependent upon the grade of the bolt. The grades are indicated on top of the bolts as raised numbers or dashes. There are three main systems of bolt classification: SAE, Metric and ASTM.

How strong is a Grade 8 bolt?

The nominal size of the grade 8 bolts can be from 1/4″ to 1 1/2″. The minimum yield strength of this grade bolt is 130,000 psi. A maximum of 120,000 psi of tensile force (proof load) can be applied to grade 8 bolts.

How hard is a Grade 8 bolt?

A grade 8 bolt is the highest grade SAE bolt. Grade 8 bolts have a minimum tensile strength of 150,000 PSI.

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.