# When 4 6 grade bolt is used then value of ultimate stress of bolt is taken as?

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## When 4.6 grade bolt is used then value of ultimate stress of bolt is taken as?

In 4.6, The first number 4 indicates 1/100 of nominal tensile strength . Hence the tensile strength = 400 Mpa. The second number indicates 10 times the ratio between lower stress(proof stress) and nominal tensile strength(yield stress ratio) means, 10 times the yield stress = 10 x 240/400 = 2400/400 = 6.

## What is the yield strength of bolt of Class 4 6?

The ultimate material strength of Grade 4.6 Threaded Rod is 40 Mpa while its yield strength or the proof stress is 60% that of the ultimate strength. The size range of these Class 4.6 Bolts falls in to the range between M5 – M36.

## What is ultimate strength of bolt?

The tensile strength or ultimate tensile strength can be defined as the maximum amount of tensile stress that a component can withstand before it fractures. … In the case of a 8.8 grade bolt the first figure signifies that the Tensile Strength is at least 800MPa.

## How do you calculate bolt stress?

For this reason, the tensile stress area is calculated through an empirical formula involving the nominal diameter of the fastener and the thread pitch. P = 120,000 psi x 0.3340 sq. in P = 40,080 lbs. As the fastener approaches the maximum strength of the threaded portion, it will permanently deform.

## What’s the difference between 4.6 and 8.8 bolts?

Category 4.6/S refers to commercial bolts of Property Class 4.6 conforming to AS 1111.1 tightened using a standard wrench to a ‘snug-tight’ condition. Category 8.8/S refers to any bolt of Property Class 8.8, tightened using a standard wrench to a ‘snug- tight’ condition in the same way as for category 4.6/S.

## Can you weld grade 4.6 bolts?

In general, fasteners, whether grade 4.6 or Grade 8.8, are not supplied as weldable items in their respective product standards and should not be welded.

## What grade is a black bolt?

The colour black, referred to the fact the steel used to make the bolts was not finished with any corrosion protection, although zinc plating is a common finish for durability. The grade 4.6, relates to the strength of the bolts.

## Is a 4.8 bolt strong?

Y is the yield strength ratio) as specified in the label. For grade 4.8, the tensile strength of the bolt is 400 MPa and the yield strength is 400*8/10=320 MPa.

## Why do bolts have 8.8 on them?

This standard covers bolts, screws, and studs made from carbon steel and alloy steel, and it lays out the requirements for ten property classes. … So, in English, a PC 8.8 bolt is a bolt with a nominal tensile strength of 800 MPa and a nominal yield strength that is 80% of the bolt’s nominal tensile strength, or 640 MPa.

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The grade of a bolt determines the maximum amount of stress (tensile strength) that the bolt can handle. 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.

## How do you find the ultimate tensile strength of a bolt?

Ultimate Tensile Strength

Take the minimum tensile strength in psi of the ASTM grade, multiplied by the stress area of the diameter. This formula will give you the ultimate tensile strength of that size and grade of bolt.

## What is the stress formula?

As expected by the units, stress is given by dividing the force by the area of its generation, and since this area (“A”) is either sectional or axial, the basic stress formula is “σ = F/A”.