What is the shear force of a Grade 8 bolt?

Shear strength of a grade 8 bolt in good condition is 91,000 psi.

How much force does it take to break a 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.

What is the shear force of a bolt?

The shear strength of a bolt is a measurement of the minimum amount of force needed to break the bolt into two pieces. The shear strength of a metal bolt is approximately 0.6 times its tensile strength. A bolt commonly shears where its head meets the threads.

What is the shear strength of 3/8 grade 8 bolt?

How strong is a 3/8 screw? A 3/8 inch bolt of this type is rated 7,000 pounds in concrete at 6000 psi (actually granite) and 4000 pounds in concrete at 2000 psi (hard sandstone).

What is the strength of Grade 8 bolts?

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.

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How do you calculate the shear strength of a bolt?

The shear strength of all bolts = shear strength of one bolt x number of bolts • The bearing strength of the connecting / connected plates can be calculated using equations given by AISC specifications. The tension strength of the connecting / connected plates can be calculated as discussed earlier in Chapter 2.

What is the shear strength of a #8 screw?

Is there a difference in strength?

* 16d common nail .162” 138 lb.
* 16d sinker .148” 115 lb.
* 16d box (nail gun) .131” 95 lb.
* #6 screw .138 71 lb.

What is an example of a shear force?


A pair of scissors is a classic example to demonstrate shear force. When an object, for example, a piece of paper is placed between the two metal blades of a pair of scissors, it gets divided into two parts only because of the shear force.

How do you calculate bolt force?

Axial Force Ff, by using Equation(1) Ff=0.7× y×As 0.7×112×20.1 1576[kgf] A bolt is tightened by torque, torque inclination, rotating angle, stretch measurement and other methods.

What is the shear strength of 1/4 20 bolt?

Material Strength – 60,000 psi J82 60M or Grade 1 or Class 4.8

Size Dia. Proof Load Str. Lbs
10-32 0.1900 660
1/4-20 0.2500 1,049
1/4-28 0.2500 1,200
5/16-18 0.3125 1,729

What grade is a shear bolt?

Registered. Normally shear bolts are Grade 2 and there is no soft grade #5 as it is either a grade #5 or not.

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.

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

How much torque can a Grade 8 bolt take?

US Recommended Bolt Torque

Size Recommended Torque
Grade 2 18-8 S/S
#6* 9.6
#8* 19.8
#10* 22.8