 # Bolt torque estimation based on angle and material • 973
• John Lloyd

## How is bolt torque calculated?

The widely recognized engineering formula, T= K x D x P (to be explained later in this article), was used to provide the chart's values, but it must be understood that every bolted joint is unique and the optimum tightening torque should be determined for each application by careful experimentation.

## How is torque calculated for metric bolts?

Metric Bolts

These estimated torque values are derived from the standard torque formula Torque = KDF utilizing a standard "free-spinning" nut (non-locknut) with a proof strength equal to or greater than the tensile strength of the bolt.

## What is the torque value of a bolt?

US Recommended Bolt Torque

SizeRecommended Torque
1/2"3745
9/16"5363
5/8"73104

## How do you calculate torque from axial force?

1. Torque is calculated only for rotating body, Torque for axial force be zero.
2. Torque = Force * Perpendicular distance.
3. Torque = Force * 0 (The perpendicular distance between the force and axis is zero)
4. Torque = 0.

## At what torque will a bolt break?

If you add 33% to the torque figure listed, that should tell you the torque required to snap it. For example, if it takes 75 ft/lbs to torque to 75% yield, add 33% (25 ft/lbs) to get to the 100% yield (breakage) figure.

## Is Bolt a torque code?

10 Snug Tight - The level of tightness attained by a few impacts of an impact wrench or by the full efforts of a man using a Standard/ podger spanner or a spud wrench. Bolts, nuts and washers shall conform to IS 3757 : 1985, IS 6623 : 1985 and IS 6649 : 1985 respectively.

## Why do we need to torque bolts?

Torque is used to create tension. Bolts are used to affix two components so that they can resist tensile (pulling apart) and shearing (sliding apart) forces. After the nut has been turned onto the bolt, additional torque causes the nut to turn and stretch the bolt.

## What is torque value?

The measure of torque equals force multiplied by distance. A lug nut, for example, may have a torque value of 75 foot-pounds. Imagine having a wrench 1 foot in length with a 75-pound weight at the end, this resulting force is equal to a torque of 75 ft-lbs.

## What is K factor in bolt torque?

where T = torque, K = nut factor, sometimes called the friction factor, D = bolt diameter, and F = bolt tension generated during tightening. This expression is often called the short-form equation.

## What happens if you over torque a bolt?

If the bolt is over-torqued, the tension can: Crush the installation material. Shorten the life of the bolt by putting too much force on it. Damage the threads by exceeding their load capacity.

## What is the torque for a 3/4 bolt?

ASTM A325

Bolt SizeTPITightening Torque Range (ft lbs) (Min - Max)
Galv+Waxed
121350 - 58
581199 - 120
3410175 - 213

## Is torque a standard?

This International Standard specifies the conditions for carrying out torque/clamp force tests on threaded fasteners and related parts. ... It is also applicable to the combination of other externally and internally threaded fasteners with a triangular ISO thread according to ISO 68-1.

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