Torque accurate
Bolting

A variety different torque tools

Torque tools are screwing tools with which a defined tightening torque is applied to a connecting element such as a screw or nut.

The goal of a screwing case is either the screwing and reaching a certain target torque with a defined, as low as possible deviation (+/- accuracy) or the specific checking of an already performed tightening for its accuracy (e.g. with a test torque wrench).

Torque screwing tools

With the screwing tools offered, you can cover a newton meter range from 0.3 cNewton meter to over 35,000 netwon meter! The applications range from simple screw connections to highly complex applications, for example in power plant construction.

Subject: Bolting

Torque-accurate screwing

A variety of different torque tools.

Torque tools are screwing tools with which a defined tightening torque is applied to a connecting element such as a screw or nut.

The goal of a screwing case is either the screwing and reaching a certain target torque with a defined, as low as possible deviation (+/- accuracy) or the specific checking of an already performed tightening for its accuracy (e.g. with a test torque wrench).

Torque screwing tools

A basic distinction is made between torque tools for the hand tightening or machine-operated tools. Manual tightening tools are, for example, torque wrenches or torque screwdrivers. Mechanical screwing can be done hydraulically, pneumatically or electrically (also battery).


Torque tools for manual tightening

Torque tools for manual tightening

The maximum tightening torque is limited by the force that the user can apply and the length of the lever. Example: With a lever length of 1,900 mm, the theoretical limit is 2,000 Nm (Newton meters). Torque tools for manual tightening include torque wrenches or Torque screwdrivers. If certain torque values cannot be achieved by hand tightening, a torque multiplier can help. This multiplies the input torque (up to 22:1). If you want to test or calibrate torque tools, torque testers will help.

Examples: Maintenance, repairs and assemblies in many areas of application, mechanical and plant engineering, power plants, the automotive sector, and much more.

Torque wrenches

Technical design

A distinction is made between mechanical (classic) torque wrenches and electronic models. Mechanical models are used in most cases, not least because of their robustness and cost reasons. Here, too, there are different approaches depending on the brand: Stahlwille, for example, uses a torsion bar. The advantage is that it is not necessary to reset to "0" to relieve the spring. Electronic models offer a multitude of options for this, such as the recording of torque cases, data transfer and evaluation on the PC, very high accuracy, digital display, and much more.

Torsion bar

No need to reset to zero. Low-wear release system with flexible rod. In contrast to conventional torque wrenches, it is not necessary to reset to "0" to relieve the spring. This results in a long-term display reliability of the desired torque value.

Torsion bar
Head and drive

Basically, a distinction is made between torque wrenches for inserting the drive tool (insert tools such as ratchets) and those that use the ratchet head permanently installed. With those wrenches that use insert tools, there are again differences depending on the manufacturer. The drive takes place via a square, a rectangular or a round insert. The advantage of torque wrenches is their flexible use: There are inserts like ratchets, open ended spanners, ring, torx, hexagon and much more. The drive (e.g. the square of the wrench) is often determined by the application (e.g. size of the socket) itself. These range from small areas such as 1/4 inch to high up to 1 1/2 inches. A wide range of applications can thus be covered.

Releasing or displaying

Releasing means that you can use the torque wrench to tighten a screw, for example and the wrench is triggered at a certain torque value (usually Nm). I.e. the tightening process is stopped, the screw has reached the desired value. In mechanical models, this is usually a click or cracking noise (can be felt in the hand), electronic models also offer the option of an optical display (e.g. green LED - red LED). The torque values are defined in advance on a scale or a display. Indicating torque wrenches must never be used for tightening. I.e. these wrenches are to be used only to check the torque value!

Special functions

Torque function/ angle of rotation function: Here, for example, the screw is tightened with a certain, defined angle of rotation. This means that an angle is added to the torque value. Example: Tightening = 50 Nm + 90°. That means a suit with 50 Newton meters (joining torque/ threshold value) and 90° angle from the threshold value.

Torque wrench with marking function: As soon as the torque wrench has reached the desired tightening value, it is Brandd with a quick-drying ink. Tightening and marking takes place in one operation!

Normalization

Torque wrenches are subject to the standard EN ISO 6789: 2017-07. This recommends a recalibration interval after a period of use of 12 months or about 5,000 load changes. We are happy to offer you our calibration service for torque wrenches!

Did you know : The world's first self-releasing torque wrench was patented in 1938 and brought onto the Brandt (Saltus-Werk Max Forst, Solingen).

Models

Torque wrench

mechanicalfor insertsclick-type

Brand Range Nm Tool holder mm Graduation Nm Accuracy +/-% Special Picture
Stahlwille 4-1,000 square 9x12. 14x18. 22x28 1-100 3 Torque adjustment with rotary knob
Stahlwille 4-650 square 9x12. 14x18. 22x28 0,5-20 4 Clamp lever adjustment with magnifying glass
Stahlwille 10-1,000 square 9x12. 14x18. 22x28 5-100 3 Individual fixed setting
Stahlwille 160-800 square 24,5x28 20 4 -
Gedore 5-400 square 9x12. 14x18 1-10 3 -
Tohnichi 0,4-850 round 8. 10. 12. 15. 19. 22. 27. 32 0,02-5 3 -
torque wrench

digitalfor insertsclick-type

Brand Range Nm Tool holder mm Graduation Nm Accuracy +/-% Special Picture
Stahlwille 10-1,000 square 9x12. 14x18. 22x28 0.2-1 2 Quick-Release safety interlock
Stahlwille 3-60 square 9x12 - 1 Quick-Release safety interlock
Stahlwille 3-400 square 9x12. 14x18 - 1 Rotation angle function, Quick-Release safety interlock
torque wrench

mechanicalfixed ratchetclick-type

Brand Range Nm Drive inch Graduation Nm Accuracy +/-% Special Picture
Stahlwille 6-300 3/8. 1/2 2-10 4 Clamp lever adjustment with magnifying glass
Stahlwille 160-1,000 3/4 20-25 4 Reversible square
Tohnichi 0.4-420 1/4. 3/8. 1/2. 3/4 0.02-2 3 QL
Tohnichi 100-2,800 3/4. 1. 1 1/2 5-20 3 QLE
Tohnichi 40-1,400 1/2. 3/4. 1 2-10 3 Titanium model
Tohnichi 10-280 Special tool holder 0.5-2 3 Marking function
Gedore 1-750 1/4. 3/8. 1/2. 3/4 0.025-1 3 Mushroom head reversible square
Gedore 40-3,000 1/2. 3/4. 1. 1 1/2 0.02-5 3 Aluminium
Torque wrench

mechanicalfor testingdisplaying

Brand Type Model Range Special Picture
Tohnichi Testing torque wrench mechanical 0.2-420 Nm -

Torque multipliers

In the event that the desired torque cannot be achieved with manual tightening, so-called torque multipliers can help. With the help of a planetary gear (translation) the tightening and loosening force is increased. This means that tightening ratios (input torque to output torque) of up to 1:22 can be achieved.

Torque multipliers
Brand Capacity Nm Tightening ratio Drive square inch Output square inch Special Picture
Stahlwille 800-5,000 up to 20:1 1/2. 3/4 3/4. 1. 1 1/2 -
Enerpac 1,015-1,355 3:1 1/2 3/4 with support lever
Enerpac 1,625-4,340 up to 18.5:1 1/2 3/4. 1 Support lever/ angle-of-turn protractor
Juwel 1,200-6,200 up to 1:22 1/2 1. 1 1/2 -

Torque screwdrivers

Technical design

As with torque wrenches, a distinction is made between mechanical and electronic models. The working environment, the application and the cost factor determine the choice of torque screwdriver. Possible fields of application: production and repair areas, small appliance construction, pharmaceuticals, medical technology, laboratories.

For tightening or testing

For tightening, the torque screwdriver is mostly used to achieve very small, defined torque values. The mechanical models mostly have a rotary slip mechanism (when the torque value is reached, the handle slips through without further tightening), digital models use acoustic and LED signals as an additional stop mechanism. Torque screwdriver for testing is mostly found as a torque screwdriver or as a test dial gauge.

Special functions

Torque screwdriver with marking function

As soon as the torque screwdriver has reached the desired tightening value, a mark is made with a quick-drying ink. Tightening and marking takes place in one operation!

Torque screwdriver with marking function: As soon as the torque screwdriver has reached the desired tightening value, a mark is made with a quick-drying ink. Tightening and marking takes place in one operation!

Torque screwdriver

for tightening

Brand Type Range cNm Tool holder Graduation cNm Accuracy +/-% Special Picture
Tohnichi mechanical 2-2,000 1/4" Bits 0.1-5 3 adjustable, rotary slip mechanism
Tohnichi mechanical 5-500 1/4" Bits - 3 preset, rotary slip mechanism
Tohnichi mechanical 0,3-8 Special bits 0.3-8 3 Rotary slip mechanism
Tohnichi mechanical 2-30 1/4" Bits 0.1-0.2 3 Rotary slip mechanism
Tohnichi mechanical 40-500 Special bits - 3 marking function
Tohnichi digital 10-400 1/4" Bits 0.05-0.5 1 for tightening and checking
Stahlwille mechanical 2-1,000 1/4" Bits 0.2-5 6 disengaging clutch coupling
Stahlwille digital 12-1,000 1/4" hexagon 0.5-5 4 80 tooth ratchet
Wiha digital 40-500 1/4" Bits - 6 with interchangeable blade
Torque screwdriver

for testing

Brand Type Range cNm Tool holder Graduation cNm Accuracy +/-% Picture
Tohnichi mechanical 0.3-400 1/4" Bits 0.05-10 3
Stahlwille mechanical 15-600 1/4" Bits 2.5-20 6

Torque testers

These are used for checking and calibrating of torque wrenches and torque screwdrivers. Torque wrench testers essentially consist of a basic unit and a sensor. The linear movement is converted into a rotary movement. This signal is transmitted to the PC with the appropriate software and can thus be documented and used, for example, for the creation of calibration certificates.

Torque tester
Brand Type Range Graduation Accuracy +/-% Suitable for Picture
Stahlwille digital 1-800 Nm - 1 Torque wrenches
Stahlwille digital 0.2-3,000 Nm - 1 Torque wrenches
Stahlwille Calibration device 0.2-3,000 Nm - 1 Torque wrenches/ torque screwdrivers
Tohnichi Dial indicator, analog 0.05-150 cNm 0.01-2 cNm 2 Torque screwdrivers
Tohnichi Dial indicator, digital 0.1-200 cNm 0.001-0.2 cNm 2 Torque screwdrivers
Tohnichi digital 2-600 cNm 0.005-0.05 cNm 1 Torque screwdrivers

Torque tools for machine tightening

Torque tools for machine tightening

If the manual force is no longer sufficient to tighten or loosen a screw connection or if the application is too difficult, a machine-operated device is usually used. These torque tools achieve torques of up to (around) 48,000 Newton meters (Nm). A distinction is made between the type of operation: hydraulic, electrical/ battery or pneumatic.

Examples: maintenance, assembly, machine and plant construction, steel constructions in crane construction, power plants, oil and gas production as well as all serious screwdriving cases.

Hydraulical drive

Square drive for sockets

Square offers the advantage, that impact sockets can be attached directly to them. The drives range from 3/4 to 2 1/2 inches, the nominal torque is 1,952 to 35,455 Nm, the accuracy is +/- 3%, the weight ranges from 3 to 32 kg for the large torque ranges. Thanks to the square drive (directly attached), they are completely variable in terms of the wrench size required by their application. It is driven by a hydraulic pump.

Verschraubgerät (Vierkant)

This drive is particularly suitable for the direct use of Impact sockets. The nut can be plugged directly onto the drive unit. No adapters or anything else are required!

Square drive

Verschraubgerät (Vierkant)
Model Range Nm (min) Square inch Weight kg
S1500X 1,952 (195) 3/4 3.2
S3000X 4,373 (438) 1 5.6
S6000X 8,338 (834) 1 1/2 9.2
S11000X 15,151 (1,516) 1 1/2 15.8
S25000X 35,455 (3,545) 2 1/2 32.2

Drive unit with cassette (hexagonal)

A drive unit and a cassette are used for bolting. The drive unit defines the newton meter range. This means that the application requires a certain loosening or tightening torque. The drive units cover a range from 2,766 to 47,454 Nm. Then you choose a cassette (insert). This enables bolting in certain wrench sizes. If the application requires a wrench size that differs from the range of the cassette, a so-called reducing insert can help. The big advantage of this bolting method is the possibility of placing the torque wrench directly on the nut. The display deviation is +/- 3%. Here too, it is driven by a hydraulic pump.

Hydraulic torque wrench (hexagonal)

A hydraulic torque wrench with a hexagonal drive has the advantage that it is easier to work under occupied space and that the flat device can also screw in narrow gaps.

Hexagonal drive

Hydraulic torque wrench (hexagonal)
Drive unit Range Nm (min) Cassette size mm Drive unit kg
W2000PX 2,766 (276) 30-60 1.4
W4000PX 5,661(566) 36-80 2
W8000PX 11,484 (1,148) 50-105 3
W15000PX 20,785 (2,078) 65-115 5
W22000PX 30,506 (3,050) 75-135 7.7
W35000PX 47,454 (4,745) 80-155 11.72

Combined drive: One device for square and hexagonal

A variably usable hydraulic torque wrench, the drive unit can be used with both hexagonal and square cassettes. Depending on the application, a drive cassette in square or hexagonal design is selected. The device has a display deviation of +/- 3%.

square + hexagonal = variable use
Multiple hydraulic torque wrench, square drive
Multiple hydraulic torque wrench, hexagonal drive
Model Range Nm Cassette size mm Drive unit kg
RSL1500 1,909 26-60 1.6
RSL3000 4,176 33-75 2.6
RSL5000 7,190 46-80 4.1
RSL8000 10,659 60-80 4.9
RSL11000 15,123 62-110 5.3
RSL19000 25,547 75-115 9.1
RSL28000 37,965 80-155 10

Power units for hydraulic torque wrenches

The pumps are operated either with electricity, with a battery or pneumatically (compressed air). Electric pumps are the most common, battery pumps are ideal in locations where there is no electricity.

Torque wrench hydraulic pump
Operation Model Usable oil volume (cm³) Weight kg Special Picture
Electrical EP3504 3,000 20.4 light weight
Electrical TQ700E 3,900 30 Protective frame
Electrical ZE4/5 4,000 62 Protective frame, LCD display
Battery (28V-5Ah) XC1502TE 2,000 12 very light and mobile
Pneumatic ZA4204TX-QR 2,700 46 Certified according to Atex 95

Electrical and battery operated

Torque machines (electrical)

The drive is electrical (230 volts), the impact sockets can be attached to a square (3/4 to 1 1/2 inch), the nominal torque ranges from 150 to 10,000 Nm, there are straight and angled models.

Torque machine (electrical), straight

It is best if there is enough space for the screw connection.

straight models

Torque machine (electrical), angled

Ideally suited for confined spaces.

angled models

Torque machine (electrical)
Type Range Nm Square inch Weight kg (straight/ angled)
straight/ angled 150-850 3/4 9.6/ 11.1
straight/ angled 280-1,200 1 9.8/ 11.5
straight/ angled 360-2,500 1 11.1/ 13.1
straight/ angled 360-3,500 1 1/2 13.9/ 15.8
straight/ angled 700-5,000 1 1/2 16.1/ 17.9
straight/ angled 816-6,000 1 1/2 21.6/ 23.7
straight/ angled 1,024-10,000 1 1/2 24.6/ 26.5

Weight information including reaction arm.

Torque machines (battery)

It is powered by a battery (18 volts, 5 Ah, battery charge under 30 minutes), the impact sockets can be attached to a square (3/4 to 1 1/2 inch), the nominal torque ranges from 150 to 5,000 Nm, there are straight and angled models.

Cordless torque machine in the mechanical engineering

For serial screw connections or during maintenance: When precise torques are a prerequisite and work has to be carried out on the move!

Application
mechanical engineering

Cordless torque machine in the track maintenance

The cordless torque machine is ideal for mobile use, for example when maintaining track systems.

Application
track construction/ maintenance

Cordless torque machine in the mechanical engineering
Type Range Nm Square inch Weight kg (straight/ angled)
straight 50-650 3/4 4.75
straight/ angled 100-950 3/4 6.8/ 8.8
straight/ angled 100-1,300 1 6.9/ 9.3
straight/ angled 100-2,200 1 8.2/ 10.1
straight/ angled 100-3,000 1 8.3/ 10.1
straight/ angled 150-4,000 1 1/2 8.5/ 12
straight/ angled 300-5,000 1 1/2 11.7/ 14.2

Weight information including reaction arm.

Bolting documentation

If you do not only want to screw, but also document the individual bolting process, we recommend the T-DOC. You can see the tightening torques on a digital display, 999 storage spaces are available, the battery life is more than 8 hours. The screw connections can be transferred to the PC using a USB cable. The accuracy is +/- 1%.

T-Doc bolting documentation

Pneumatic bolting

Pneumatic bolting is less common but may be desirable in certain cases. In this segment we offer the option of a selection of small devices (range Nm: 5-180) to cover large Nm ranges (up to 8,135).

Torque machine (pneumatic)
Brand Range Nm Tool holder square inch Accuracy +/-% Picture
Tohnichi 5-180 3/8. 1/2 3
Enerpac 407-8,135 1. 1 1/2

We are

We are a family-run wholesale company for technical tools and hydraulic products. We stand for competent customer advice and high quality products.


SEWA-Werkzeuge GmbH
Kapruner Generator Straße 18
+43 (0) 3172 4755-0
office@sewa-werkzeuge.com
Mon-Thu 7:30am - 4:30pm / Fri 7:30am - 3pm

Current news

Twingrip slip joint plier from Knipex: Loosen stuck bolts and screws easily and safely!

News