HomePage
Electronic-components
Embedded
Industry automation
Security
Test & measurement
Tools
Electromobility
Solar energy
Lighting
Jobs
Training , Trade fairs, Evens
Interesting video
Various
AR236.B & AR232.B
 
APAR AR236.B & AR232.B radio loggers
JZ-500 and JZ-500-C black
 
JZ-500 and JZ-500-C black cables manufac
HF41F
 
HF41F subminiature power relays from HON
GT-900B
 
GOLDTOOL toolsets in cases
Intel® Neural Compute Stick 2
 
RS Components announces availability of
MC4
 
MC4 solar connector sets
WIHA-SB24670
 
Multifunctional WIHA LED Torch
G2RV-SR
 
G2RV-SR interface relays from OMRON
LUP-20-LED
 
LUP-20-LED-SMD desktop magnifier
LinkSwitch™-XT2
 
Power Integrations Unveils High-Efficien

Torque wrenches

Torque wrenches

Torque wrenches are basic tools which provide safe and accurate assembly of bolted joints. Let us take a look at how they work and learn about the wide selection of these tools on the market.

In this article you will find out: What is a torque wrench

A torque wrench is a tool used for tightening or, less frequently, loosening bolted joints (screws and nuts) with a precisely defined force, or, more precisely – with a torque. Tightening the connections with a certain torque is crucial when installing and servicing various appliances. When adjusting the torque to the bolt connection, you should always follow the engineering guidelines.

The torque is the vectoral product of the force applied to the lever arm and the length of the lever. The torque is expressed in Newton metres (Nm). It means that if the bolt is tightened using a 50-centimetre long wrench with the force of 100 Newtons, then the torque which will tighten the screw thread is 50 Newton metres. In the UK and the US, torque is referred to using a different unit, namely a foot pound-force (ft lbf) – 1 Nm is approximately 0.738 ft lbf.

The tightening torque of the bolted joint affects the force that the screwed elements apply on the whole structure. In order to understand the importance the tightening torque, you need to comprehend the mechanics of the screw thread and its tightening process. Generally, a bolt can be compared to a spring. The more tightened it is, the more it extends and the stronger it tightens the bolted elements. Tightening the bolt extends its length proportionally to the applied torque, but this length is limited – just as it is the case with a regular spring. Once the yield strength of metal is exceeded, the spring will not return to its original shape. The same applies to a bolt.

An over-tightened bolt which is a subject to constant tension, will not apply enough force and most likely cause damage to the device – either through loosening (e.g. caused by vibration) or breakage of a deformed bolt. The bolt won’t be able to return to its original shape, so loosening and re-tightening it won’t be a safe solution.

In order to tighten the screw properly, the appropriate torque must be applied to it. To measure this torque, you need a torque wrench. Selecting the optimum tightening torque guarantees the following:

  • The bolted connection will hold with a force greater than the greatest force from all the forces that try to separate it.
  • The bolt will be tightened with an optimum force, and it will remain so – it will not get loosened or tightened over time.
  • The bolt can be loosened and tightened without reducing the quality of the bolted joint.

It is necessary to know the value of the torque with which the connection must be tightened. It depends e.g. on the material of the components, the size and the thread pitch, as well as the specific application.

When a threaded joint is not tightened enough, it can loosen further, e.g. due to vibration or the movement of the joined components. If, on the other hand, a bolted joint is overtightened, the thread material stretches and can be weakened, resulting in damage. It may have a permanent impact on the threaded components and, as a result, render them unusable. Overtightened bolts should be replaced with new ones.

Both under- and overtightening of a bolt may cause a malfunction. It is important to tighten each bolt or nut according to the values declared by the manufacturer. A tool used to apply a specific torque is a torque wrench. If properly calibrated, it improves safety and reliability of each critical threaded joint.

What are the types of torque wrenches?

Most of the time, a torque wrench works like every other wrench. Only when the required torque is reached, the wrench mechanism is triggered. It prevents the wrench from exceeding the desired torque.

There are many torque wrenches with different internal mechanisms available on the market. One of the most popular torque wrenches is the so-called click-type torque wrench, with a special locking pawl (clutch) which prevents the wrench from operation once the desired torque is reached. It’s mechanism is similar to the ratchet wrench which drives only in one direction. The torque wrench clicks once the desired torque is exceeded.

Other torque wrenches available on the market are, e.g. break-back torque wrenches. The mechanism of these wrenches makes the upper part of the tool “breaks” by about 20 degrees after obtaining a given torque.

A separate group of torque wrenches are those equipped with a dynamometer, but without a torque limiter. Such a tool shows the value of the torque with which we are currently tightening a bolt or nut. In this category you will find simple beam and scale wrenches, but also complex electronic tools, often with a computer interface and memory which allows you to log in the number and torque of connections tightened during the day.

What is the purpose of a torque wrench

Torque wrenches are used in many areas of industry – wherever it is necessary to tighten components with a precisely defined torque. The basic application of a torque wrench is mechanic engineering – it is used in car workshops and other similar places where it is necessary to precisely tighten mechanical elements. However, these are not the only applications of torque wrenches. These tools are also frequently used in different fields of electronics and energy.

Torque wrenches are commonly used for tightening precision coaxial connectors in high-frequency systems. N, SC, SMA, SMC, SSMA SSMC, SSMA or TNC type connectors need to be tightened with the right torque to achieve their designed impedance and reduce losses. In addition, tightening such connectors with the right torque guarantees that the connector will not be damaged and it will be possible to repeatedly connect and disconnect it without deterioration of its electrical parameters. Another application of torque wrenches is tightening power busbars. Their use ensures optimal contact and low resistance of the connection.

However, such wrenches are used not only in mechanics or electronics. There are torque wrenches for such unusual applications as... dentistry – it is necessary to tighten dental implants with a specific torque in order to make them fit the human body perfectly.

The accuracy of torque wrenches, regardless of the application, is regulated by strict industry standards. The most important that are recognised in our country are:

How to choose the best torque wrench for your workshop?

Many types of torque wrenches are available on the market. The most commonly used ones include:

  • Beam torque wrenches – with a long pointer running from the head of the wrench along its handle. When you start to apply force to the wrench, its handle starts to bend slightly under the influence of the torque. At the same time, the pointer remains in place and starts to move along the attached scale, indicating the torque that is currently applied to the bolt. These wrenches require precision and skill as they do not automatically block any further movement. The user must observe the scale of the dynamometer to stop tightening as soon as the indicator shows the correct torque.

  • Wrenches with a round scale – they are a simplified version of beam wrenches. They have a circular scale on the handle, with a pointer which shows the current torque. They are simpler to use than beam wrenches because they have no external moving parts – all mechanisms of such wrenches are hidden inside the body.

  • Click-type torque wrenches – the most popular type of torque wrenches available on the market. In contrast to the two other types mentioned above, they allow for the maximum torque to be applied to the connection. To do this, simply turn the lower part of the key handle to set the required torque on the scale above the handle. The handle is then counteracted by a screw, so that it does not move during operation.

Beam wrenches are the most difficult of these three types to operate, but at the same time they offer the highest precision, which is surpassed only by very expensive electronic wrenches. Click-type wrenches are slightly less accurate, but they are sufficient for most applications, especially considering how easy it is to calibrate them. For most applications it is therefore best to choose this type of a tool.

The basic parameter of a torque wrench is the torque or the range of torques with which the screws can be tightened. The available ranges are vary from 2,5 Nm - 25 Nm up to 80 Nm - 400 Nm. WERA offers wrenches covering the entire range, so you can easily select the wrench for each application.

Useful torque wrench accessories

Torque grips are equipped with standard 1/2", 2/8" and 1/4" socket heads (depending on the size and torque range). These wrenches are complemented by standard socket accessories, such as joints or extensions.

2019072003 / 26.07.2019 / Tools / Transfer Multisort Elektronik Sp. z o.o. /

New series of High Power DC motors from POLOLU
New series of High Power DC motors from POLOLU
TME’s offer now includes the 25D series of HP motors from American manufacturer POLOLU. Due to their high power, the motors are adapted to work with maximum voltage of 12V (450mA with free revolutions and 5.6A with shaft stopped). Depending on the type of gearbox, they offer torque of 0.16Nm to 2.12Nm.
.....
SO9 series of semiconductor relays
TME’s offer has been enriched by SO9 series of semiconductor relays from CELDUC. The SO9 relays are designed for resistive loads. Key features of the SO9 series include input surge protection and limiting input current to 13mA, as well as the operational indicator (LED diode).
.....
SO9 series of semiconductor relays
SUNON PMD2412PMB1A axial fan
SUNON PMD2412PMB1A axial fan
As one of the largest electronic component distributors in Europe, TME offers a wide range of products from SUNON.
.....
Reinforced FLRYW-B cables by BQ Cable
FLRYW-B cables are an improved version of FLRY-B cables manufactured by BQ CABLE. Thanks to the use of reinforced insulation, these cables are able to operate at higher temperatures of up to 125°C, while maintaining all the properties of FLRY-B cables.
.....
Reinforced FLRYW-B cables by BQ Cable
Programmable RGB LEDs by LITEON
Programmable RGB LEDs by LITEON
Programmable RGB LEDs offered by LITEON are a combination of an integrated LED driver and RGB light emitting structures in a single, miniature housing. With this design, the philosophy of controlling such an RGB LED is completely different.
.....
LPB series compact flush-mounted power supplies by ESPE
LPB series power supplies by ESPE are compact, 12W devices for powering LED lighting systems. They are made of high quality electronic components that allow long-lasting work in virtually all environmental conditions. LPB power supplies are characterized by high reliability, as they are fitted with a full range of necessary protections against overload, overheating, overvoltage, and short-circuit.
.....
LPB series compact flush-mounted power supplies by ESPE
JBC-NASE-2C soldering station from JBC TOOLS
JBC-NASE-2C soldering station from JBC TOOLS
The JBC-NASE-2C soldering station from JBC TOOLS is an excellent solution for soldering SMD components and other very small elements and chips requiring high precision. This station utilises the JBC TOOLS’ Most Efficient Soldering System that heats up the soldering tip to 350°C in just 2 seconds and the intelligent hibernation mode (Intelligent Heat Management) that automatically cuts off the soldering iron’s power supply when it’s put back on the stand.
.....
Single-track silicone connectors from Jiffy Splice
Jiffy Splice connectors from TE Connectivity are a unique, easy-to-use alternative to permanent splices. They are made from the same high-quality silicone elastomer as DEUTSCH connector seals and grommets. The body of a Jiffy Splice connector secures a pair of contacts in a compact, environmentally sealed unit that is resistant to fuels, oils, and other liquids. Since they are available in two sizes (for size 16 and size 12 contacts), you can connect wires with cross-sections from 0.5 to 2.5 mm2 (from 20 to 12AWG). Contacts must be purchased separately according to requirements.
.....
Single-track silicone connectors from Jiffy Splice
SPB228-D-2 IoT module from H&D Wireless
SPB228-D-2 IoT module from H&D Wireless
SPB228-D-2 is a wireless communication module for Wi-Fi and Bluetooth networks, dedicated for industrial applications. Its important feature is simultaneous or completely independent operation in Wi-Fi and Bluetooth standards with the ability to transmit in two bands: 2.4GHz and 5GHz (the module has two MHF-4 antenna connectors). A characteristic feature of the SPB228-D-2 is its large number of serial communication interfaces that facilitate its integration in intended application.
.....
A new ZD line of modular DIN rail enclosures by KRADEX
The ZD product line uses modern replaceable terminal covers which can be easily adjusted to various requirements related to the inside of electronic components. KRADEX enclosures are protected against accidental detachment, without any additional metal elements. The enclosure is mounted on the rail by means of snaps locks, thanks to which it can be easily slid in and out.
.....
A new ZD line of modular DIN rail enclosures by KRADEX
Omron G2R electromagnetic relays
Omron G2R electromagnetic relays
The OMRON relays from the popular G2R general-purpose series can switch 10A current in 1-pole and 5A current in 2-pole configuration. Reliable construction provides 5000V dielectric strength between coil and contacts and 10000V surge resistance.
.....
How to pick the best soldering iron?
Soldering iron is a handheld tool for soldering, i.e. for joining two metal objects permanently, using a different metal (solder), which has a lower melting point than the components that are being joined. Soldering is the basic method of assembling electronic components on printed circuit boards.
.....
How to pick the best soldering iron?
TME now cooperates with RADER
TME now cooperates with RADER
TME has established a cooperation with RADER - specialist for high-quality wheels and castors for handling equipment.
.....
Iron Warriors' great performance at the Educ Eco Valenciennes 2019
On 16-18 May 2019 the Iron Warriors team took part in the Educ Eco competition in France. The tournament was held on the Toyota track.
.....
Iron Warriors' great performance at the Educ Eco Valenciennes 2019
Torque wrenches
Torque wrenches
Torque wrenches are basic tools which provide safe and accurate assembly of bolted joints. Let us take a look at how they work and learn about the wide selection of these tools on the market.
.....
Silent laboratory power supplies by Manson
Multi-channel switched-mode power supplies by MANSON ensure a high comfort of use. They are fitted with a bright, easy-to-read display. Thanks to the convection cooling, they do not require a fan, which makes them remarkably silent.
.....
Silent laboratory power supplies by Manson
A team of students from Wrocław University of Science and Technology at Spaceport America Cup 2019
A team of students from Wrocław University of Science and Technology at Spaceport America Cup 2019
On 18-22 June a team of students from Wrocław University of Science and Technology in Space took part in the 14th edition of the Spaceport America Cup 2019 competition organized by Experimental Sounding Rocket Association (ESRA) in New Mexico.
.....
Car lighter socket housings from SCI
TME has enriched its offer with car lighter socket housings from SCI.
.....
Car lighter socket housings from SCI
Company of the week

Keysight Technologies
Address Book


Keysight Technologies


XP Power Limited


Yamaichi Electronics USA Inc.


Fischer Connectors SA


Nicomatic


TE Connectivity


akYtec GmbH


SOS electronic s.r.o.


MARVELL


Taiwan Semiconductor


ROHM Semiconductor


ČEZ a.s.


Pickering Interfaces Ltd


ANRITSU


Mouser Electronics


Foremost Electronics


RS Components GmbH


SECTRON


FAULHABER


Willow Technologies


ABB


Visual Communications Company, LLC


ACS Motion Control


LASER COMPONENTS


Transfer Multisort Elektronik Sp. z o.o.


Hradil Spezialkabel GmbH


Sonderhoff Holding GmbH


Radio Frequency Systems


Apacer Technology Inc.


Pico Technology
Calendary
NEPCON Japan, Tokio, 15.1.-17.1.2020
Intersec 2020, Dubai, UAE, 19.1.-21.1.2020
DistribuTECH, 28.1.-30.1.2020, San Antonio, TX
BATTERY JAPAN, Tokyo, 26.2.-28.2.2020
Light + Building 2020, Frankfurt am Main, 8.3.-13.3.2020
AMPER 200, Brno, CZ, 17.3.-20.3.2020
SECUTECH 2020, Taipei, 22.4.-24.4.2020
PCIM Europe, Nuremberg, 5.5.-7.5.2020
SMTconnect 2020, Nuremberg, 5.5.-7.5.2020
LED Expo Mumbai 2020, 7.5.-9.5.2020
SPS Italia, Fiere di Parma, 26.5.-28.5.2020
Wire & Cable Guangzhou, China, 27.5.-29.5.2020
Automechanika Dubai, 7.6.-9.7.2020
hardware+tools, Dubai, UAE, 7.6.-9.6.2020
PCIM Asia, Shanghai, 1.7.-3.7.2020
SPS Automation Middle East, Dubai, 20.8.-21.8.2020
Intersec Buenos Aires, 26.8.-28.8.2020
Automechanika Frankfurt, DE, 8.9.-12.9.2020
BATTERY JAPAN, Osaka, 9.9.-11.9.2020
IMTS2020, 14.9.-19.9.2020, Chicago, IL
Interlight Russia, Moscow, 14.9.-17.9.2020
Prolight + Sound NAMM, Moscow, 17.9.-19.9.2020
Prolight + Sound Shanghai, 28.10.-30.10.2020
SPS 2020, Nuremberg, 24.11.-26.11.2020
ISE 2021, Barcelona, Spain, 2.2.-5.2.2021
DistribuTECH, 9.2.-11.2.2021, San Diego, CA
BATTERY JAPAN, Tokyo, 3.3.-5.3.2021
BATTERY JAPAN, Osaka, 29.9.-1.10.2021
DistribuTECH, 25.1.-27.1.2022, Dallas, TX
DistribuTECH, 7.2.-9.2.2023, San Diego, CA
Interesting video
The ISS Design Challenge ...
Interesting video
Mouser Electronics Warehouse Tour with Grant Imahara
naše portály dle jazyka:

česko/slovenská jazyková verze:
WWW.ELEKTRONIKA.CZ
WWW.ELEKTRONIK-INFO.CZ

anglická jazyková verze:
WWW.ELECTRONICA.ONLINE
WWW.ELECTRONIC-INFO.EU
WWW.COMPONENTS.ONLINE

polská jazyková verze:
WWW.ELEKTRONIKA.ONLINE/pl
WWW.ELEKTRONIK-INFO.PL

ruská jazyková verze:
WWW.ELEKTRONIKA.ONLINE/ru
WWW.ELEKTRONIK-INFO.RU
naše portály dle zaměření:

ELEKTRONIKA.ONLINE :
WWW.ELECTRONICA.ONLINE
WWW.ELEKTRONIKA.CZ
WWW.ELEKTRONIKA.ONLINE/pl
WWW.ELEKTRONIKA.ONLINE/ru

ELEKTRONIK-INFO:
WWW.ELECTRONIC-INFO.EU
WWW.ELEKTRONIK-INFO.CZ
WWW.ELEKTRONIK-INFO.PL
WWW.ELEKTRONIK-INFO.RU

COMPONENTS:
WWW.COMPONENTS.ONLINE
  kontakt:

MALUTKI media s.r.o.
Těrlická 475/22
735 35 Horní Suchá
tel. 00420-603531605
e-mail: info@malutki-media.com



All trademarks are the property of their respective owners.
ISSN 1801-3813