How to use a torque wrench - instructions with examples

How to use a torque wrench - instructions with examples

1. ➡️ Rules for using a torque wrench: ➡️ Snap type: how to use the wrench and scale
2. ➡️ Torsion bar type with pointer arrow
3. ➡️ Electronic key
4. ➡️ With horn attachments

A torque wrench is a special tool, a device that is used to tighten the bolts and nuts of various components and mechanisms with the required torque.
This force is measured in Newton meters (Nm). To ensure reliable, accurate and trouble-free operation, most modern mechanisms must be assembled with maximum precision. Deviation of the dosed tightening force can negatively affect both the quality of operation of the unit or mechanism and its service life.

How to test a torque wrench at home? — Machine tools, welding, metalworking

In vehicle maintenance instructions, you can often find tables indicating the torque for tightening fasteners.

It is especially important to observe the value on parts such as the intake manifold, cylinder heads, and suspension joints. Service station technicians use special devices: torque wrenches.

What kind of instrument is this?

Such a device is necessary for tightening connections that require a uniform, measured application of force. There is a lot of debate about its necessity. But it is obvious that this tool is indispensable for clear indicators of the pressure force on a bolt or nut. The key can also be used in other areas: assembly of machine guns, industrial equipment, shipbuilding.

That is, if, for example, the instruction manual for your car states that the nuts should be fixed with a force of one hundred and ten newtons, then you can accurately ensure such indicators only with the help of a torque mechanism.

Particularly important will be the ability to set a given parameter. It is the accuracy of tightening the various connections of the mechanism that is the advantage of this device. Manufacturers produce many types of such instruments.

They consist mainly of parts similar to all models:

• handles for attaching the nozzle, which is tightened;
• an attachment clamp having positions in positions one to three;
• removable attachment made in the form of a ratchet;
• a spring mechanism having a measuring scale;
• a handle equipped with a lock that regulates the specified force.

How to use a torque wrench scale. Video:

What it is

A torque wrench is a tool that is used to tighten high-strength bolts while allowing the tension to be controlled. The design documentation indicates the tension force of high-strength bolts. The moment is calculated from this value and the characteristics of the bolts. And at this moment the bolts are tightened using a torque wrench.

This key must be verified. And for each work, a control calibration must be carried out. And the calibration data must be entered into the control calibration log of torque wrenches. This is one of the steps to control the quality of work on installing high-strength bolts. Accordingly, this work must be performed by specially trained and certified specialists.

conclusions

Of course, each car owner must determine for himself which one to choose and whether it is needed at all for the specific conditions of use of the vehicle. In addition, professional use of wrenches requires many additional accessories: sockets, adapters, cardan couplings, adapters. The pleasure of having a complete set of torque tools will cost the car owner a decent amount. However, for a small vehicle repair business it is impossible to do without it.

Because we have never encountered such a tool. Why are such devices needed? In what types of work are they used? Let's try to answer the questions presented.

Design of a torque wrench for a car

Torque wrench device

Tool manufacturers produce various types of torque wrenches, which nevertheless consist of the following parts common to them:

Automotive torque wrenches vary in the size of the lever that creates the maximum applied force and the size of the square for the replacement head. Thus, according to the setting limits for the tightening force, wrenches are produced with limits ranging from 5 to 25 Nm and ending from 140 to 2000 Nm. Based on their design and operating principle, the following types of torque wrenches are found on the Russian tool market.

Video: Torque Wrench. How does he work?

Tips from professionals when making a key

The tool may not work the first time, and the measurement will be incorrect. However, any experienced master can give several detailed tips, following which every beginner will achieve the desired result.

If you do not have a lever or materials for it, you can use a regular wrench with an open-end grip on one side and a box grip on the opposite side. However, the ratio of length and torque should be calculated more carefully here, since the size of the arm will most likely be a fractional number.

For better fixation of the steelyard to the lever, you should be especially careful about the place where it is installed. The best option is a carefully drilled through hole, exactly at the point where the load is applied, and the device will never slip off the handle.

Working with a homemade torque wrench

Depending on the required tension, the master may have several steelyards with different weighing limits, each of which must have its own table depending on the load on the arm and torque.

Since all efforts when determining the degree of tightening are applied only to the scales, it is necessary to ensure a comfortable grip on the handle, since 20-30 kg with a poor grip will not allow you to comfortably work with the device.

How to tighten cylinder head bolts without a torque wrench

In vehicle maintenance instructions, you can often find tables indicating the torque for tightening fasteners.

It is especially important to observe the value on parts such as the intake manifold, cylinder heads, and suspension joints. Service station technicians use special devices: torque wrenches.

This is an expensive item: if it is used occasionally, it is not worth purchasing. Therefore, many car enthusiasts who service cars themselves make a torque wrench with their own hands.

It’s not possible to make a tool completely free of charge: at a minimum, you need a factory key, as well as a device that fixes torque.

Maximum torque for bolt tightening

In order to properly tighten car bolts and nuts without damaging them, the technician must be aware of the maximum forces depending on the length, diameters of the elements, and the quality of the steel from which they are made. These data on the maximum torque are shown in the table.

see also

Comments 61

Second key and checking the fasteners. It has been tested more than once, you are not the first to break/disassemble. The accuracy of clicks is mediocre by the way

We set it up according to the instructions, you need weights and a little time, about 1-2 hours. Nothing complicated.

let the little one set it up and then let people use it, and they’ll buy you another one, I think you’ll get by with a simple key, not home tuning

The center will calibrate it on a stand.

sawed the head with a grinder DO NOT DAMAGE THE TOOL - GGGYYY

Nope, this is from a set of 21, the boiling nut on the wheel was torn off. There is no other way, I had to buy 3 more of these. The hole on the disks is very narrow, others cannot get through. And these are very brittle, the meat grinder crushed them like seeds.

but it's a candle burner

Yes, but there was no other

Remember the strength of strength, the length of the lever and the force are measured by a steelyard-dynamometer. Here's an example: bikepost.ru/blog/60615/Pr…omashnikh-uslovijakh.html

Thank you for finding something like this

Just check it on such a tester - I have one.

Just check it on such a tester - I have one.

where to buy one? and what is it called

I am not in Russia. American tester. PROTO J6476 Price is about 2000 dollars

Just check it on such a tester - I have one.

I would like to check mine if possible...

You can calibrate it. I checked mine. According to GUG. Somewhere I found how. There you need to have mathematics and canter. The length of the handle is taken into account.

correctly assemble, compare and configure using a different key. I think this accuracy is enough for the garage.

give it to these Kulibins, and they will give you money to buy a new key

I was looking for a diagram, but damn, such keys act by bending the spring, which snaps at a moment. It’s not so easy to twist everything back

I understand that the key is adjusted by an intermediate washer, it’s the 3rd from the left in the photo, or it’s wrong), I just don’t remember whether it was fixed or not, it is screwed into the handle and ends with a nut. Here’s the only question: if the spring is now pulled to its minimum, then why doesn’t the ratchet click even with a small load. The tongue seems to have sunk...

I was looking for a diagram, but damn, such keys act by bending the spring, which snaps at a moment. It’s not so easy to twist everything back

There are no spare parts for half of them. Need more arguments? Why does it need to be returned?

Give it back and have them replace it or fix it.

Give this key to your friends and let them buy a new one!

I read the comments. I repeat. Give the key to a friend and let him buy a new one. Moreover, the key does not cost 3 kopecks. How is this possible? Take a working tool, but return a mountain of bolts? Who is this person after? Right. Pi dor. And you're a weirdo. Once I took the broken key back. Sorry, nothing personal, just emotions. I am outraged by this attitude towards the instrument.

I just don’t understand half of the comments, it seems like I wrote everything in an accessible way, “how to set up or calibrate?” indicated the reason for the breakdown, “it was disassembled” (they didn’t drop it, didn’t deform it, but simply unscrewed the handle all the way...), everything else remains behind the scenes, I don’t cry and don’t say, “people, we need to get together and pile on”, or squeeze out money for the key.

Sorry for the offtopic. Now I have to read all this spam, since I described this asshole situation, people want to sympathize and discuss all the details. ;-)))

When I was little, I ruined so many of my dad’s tools... for which I got a lot of money,

So that's my dad's. Dad didn’t return it to his friend broken.

Well, for me he was Batin, but in reality I don’t know whose he was...

for home verification - fix the key by the square in a vice and hang the weight on the measured area. 100nm - 10 kg of force applied to a 1 meter lever

The first rule for using a torque wrench. Don't give ANYONE the key

Plus, regarding the return of the tool in exchange for a new one, this is not how things are done.

It's hard to give tools to use that are more difficult than an open-end wrench))).

And it will be broken or bent

It happened, he gave me a sledgehammer... they brought two halves (it broke on the handle) and they were like, “Why did you give me the broken one?” In the fall I gave my nephew a charger for the evening, and to this day I can’t get the pussy out...

Gave my bro a set of licota combination wrenches, took a 13 Jonesway, a 14force and two ratchet ones as compensation