# Where To Find Aviation Torque Values?

## How do you identify aircraft bolts?

AN-type aircraft bolts can be identified by the code markings on the bolt heads. The markings generally denote the bolt manufacturer, the material of which the bolt is made, and whether the bolt is a standard AN-type or a special purpose bolt.

## Why does aircraft hardware have torque values?

Why does aircraft hardware have torque values? Aircraft hardware has torque values to measure the amount of turns or twists in force applied to the nut, and due to this, prevents damage to the threads.

## 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 grade are an Bolts?

The most common grading system used for bolts in the U.S. is the SAE system, but you can find metric grading systems as well. 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.

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## What is a friction drag torque?

Free running, prevailing, or friction drag torque is the amount of torque it takes to turn the nut on the threads. This value will be very small for a plain nut and somewhat higher for a self-locking nut. Regardless of the number, this torque value must be added to the desired torque to achieve final torque.

## How is bolt torque required?

DETERMINING TORQUE The general equation for bolt load based on applied torque is T = KFiDb where K = torque coefficient. K is a function of the coefficients of friction and collar friction in the joint, and these are based on variables such as surface finish, coatings, and so on.

## How many threads should show on a tightened bolt?

Threaded fasteners, when installed and tightened, should protrude a distance of at least one thread beyond the top of the nut or plastic insert. Excessive protrusion should be avoided, particularly when necessary clearances, accessibility, and safety are important.

## How do I check my torque specs?

Three Proven Methods of Verifying Torque Specifications

1. First Movement Test – Once the fastener has been tightened, employ the use of torque measuring tool.
2. Loosening Test – This is a similar process to the first movement test described above, except instead of the tightening the fastener, the torque is applied in the direction that loosens the fastener.

## What is a Newton Metre of torque?

The newton – metre (also newton metre or newton meter; symbol N⋅m or N m) is a unit of torque (also called moment) in the SI system. One newton – metre is equal to the torque resulting from a force of one newton applied perpendicularly to the end of a moment arm that is one metre long.

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## Is 400nm of torque good?

Large engines, both petrol and diesel, are inherently high torque. It’s worth noting that engines producing much more than 400 Nm (295 lb/ft) of torque, whether petrol or diesel, are usually at their best teamed with an automatic gearbox.

## How is tightening torque of a bolt calculated?

The basic formula T = K x D x P stated earlier takes these factors into account and provides users with a starting point for establishing an initial target tightening torque.

## What is the torque tightening value required for M16 bolts?

Torque Tightening Values for Structural Steel Bolts

Maximum Recommended Tightening Torques