Torque Tools Calibration

Why Calibrate Your Torque Tool?

To keep torque instruments accurate and long-lasting, they must be calibrated. Calibration guarantees that the device continues to meet its specified criteria, which in turn guarantees the highest level of accuracy and dependability in measurements. General wear and tear may negatively impact the tool's internal components without a calibration, perhaps producing inaccurate and hence untrustworthy data.

 In order to maintain tools in compliance with their specified standards, ranges, and accuracy, our team of calibration professionals is capable of evaluating a variety of torque instruments and making modifications as needed.

ISO 6789-1:2017 & ISO 6789-2:2017 Torque Calibrations

The following tools can have ISO 6789-1:2017 and ISO 6789-2:2017 compliant inspections

Torque screwdrivers, brake-type torque wrenches, and click-type torque wrenches

The international organization for standardization (ISO) developed these two calibration standards especially for torque tools classified as Type I (indicating) and Type II (setting). Every standard specifies the conditions and steps required to keep up compliance with different Type I and Type II torque tool standards. An overview of each standard can be found below.

ISO 6789-1:2017 Overview

A declaration of conformance can be found using the ISO 6789-1:2017 standard. In order for a Type I (indicating) or Type II (setting) hand torque tool to receive a declaration of compliance, it describes the conformance tests, marking specifications, and minimal requirements.

The hand torque tools that are expressly categorized as Type I (indicating) and Type II (setting) torque instruments, such as those used for carefully tightening screws and nuts, are covered by this standard.

The Type I and Type II hand torque tool calibration certificate standards are absent from the ISO 6789-1:2017 standard, which sets it apart from the ISO 6789-2:2017 standard.

ISO 6789-2:2017 Overview

Similar to the aforementioned standard, ISO 6789-2:2017 can be used to confirm the accuracy of hand torque tools intended for both Type I indication applications and Type II setting applications.

This standard, however, differs from ISO 6789-1:2017 in that it contains information about how to calibrate hand torque equipment and calculate measurement uncertainties. When the relative uncertainty interval (W' md) is unknown or not supplied by a traceable calibration certificate, the ISO 6789-2:2017 specifies the minimal requirements needed for calibrating Type I or Type II instruments.

Calibrations that are quasi-static (continuous) or static (step-by-step) can both use this standard. The torque of the instrument-under-calibration in these cases is defined by measuring the elastic form change of a deformable body or is calculated from a measured variable that is proportionate to the torque.

Calibration & Repair Options

We can calibrate torque equipment at your location or in our lab as a nationwide business. To find out which of the three alternatives below best fits your needs, please get in touch with our calibration team:

• We will arrange for your torque equipment to be picked up and transported to our lab by courier. • Send your torque equipment to our calibration lab by your preferred means or courier.

• On-location adjustment

For individuals who have a lot of equipment that would be too big to ship by courier, on-site calibrations are advised; a calibration professional will visit your location and complete the calibrations that are required.

About Torque Calibration

Applying a precise torque to fasteners like nuts and bolts is done with the use of torque wrenches. When a screw or bolt's tightness is critical, they are frequently utilized. Tightening bolts on wheels in the automotive industry and piping applications, like high pressure natural gas stations, are common uses for torque wrenches. Failure to tighten flanged connection bolts in accordance with manufacturer specifications could damage vital equipment, result in a serious accident, or leak gas.

Torque wrenches come in several varieties. These are the most prevalent types:

Beam Type Torque Wrench

Since they are the most reasonably priced, they are the most widely used tools in the industry. Between the wrench head and handle of a beam torque wrench lies a lengthy lever arm. The user can view the torque applied to the fastener by looking at the scale that is attached to it. The user releases the force when the desired torque is obtained. Simple in design, this kind of wrench finds utility in a variety of situations where precise measurements are not necessary.

Click Type Torque Wrench

When the desired torque is obtained, an audible sound is produced by this sort of torque wrench since the intended torque level is pre-set (with a calibrated clutch mechanism). When the torque wrench is calibrated correctly, the benefit of using Click Torque Wrenches is that they prevent overtightening of the fastener, perhaps preventing damages from overtightening. Each Click Torque Wrenches must be reset to zero after each usage and require a minimum of one year's calibration.

Electronic Torque Wrenches

This kind of instrument uses a strain gauge that is fastened to the torsion rod to measure torque. The generated signal is displayed on the digital display after being transduced to the desired unit (N×m or lb×ft) by a transducer.

According to ISO 6789:2003, "Assembly tools for screws and nuts — Hand torque tools — Requirements and test methods for design conformance testing, quality conformance testing, and recalibration procedure," torque wrenches fall into two categories. Additionally, they are categorized based on how they operate:

Type I: Indicating Torque Tools

Tools in this category display the torque the tool exerts at the output drive via an electronic display, mechanical scale, or dial. The following categories apply to Type I Torque tools:

Torsion or flexion bar wrench (coil spring or deflecting beam torque wrench) in Class A; rigid housing wrench in Class B; scale or dial display in Class C; and rigid housing wrench with electronic measurement in Class C

• Screwdrivers with dial or scale displays fall under Class D.

• Screwdrivers with electronic measuring fall under Class E.

Type II: Setting Torque Tools

This type of wrench is pre-set to a specific torque value; hence, an audible or visible signal is released when the tool exerts the desired torque value at the output drive. Type II Torque tools fall into the following categories:

Class A: Adjustable, graded, or equipped with a display wrench; Class B: Fixed adjustment wrench

Class C: Adjustable, non-graduated wrench; Class D: Adjustable, graduated, or display screwdriver; Class E: Screwdriver with fixed adjustment

• Class G: Adjustable, graded wrench for flexion bars (a graduated torque wrench with an adjustable beam type); • Class F: Adjustable, non-graduated screwdriver;

As per ISO 6789:2003, torque wrenches are classified according to their class and category and have a specific accuracy.

Type I (Indicating Torque Tools)

Type II (Setting Torque Tools)

Due to their frequent use, torque wrenches quickly lose their accuracy and setting points, making them instruments that require routine calibration. The way the tool is used and the conditions it is kept in affect its calibration integrity. For at least 5000 cycles, a torque wrench should stay within the tolerances as listed in the aforementioned tables. However, this period is frequently shortened for a variety of reasons, including dust infiltration that leads to wear, damage from dropping the tool frequently or using it to loosen fasteners. To ascertain the appropriate re-calibration interval for a particular torque wrench, it is necessary to first establish a calibration interval (e.g., six months), and following the analysis of many calibration findings, Vary the calibration interval in size. We can be certain that our torque wrench is within specs by doing this. Regardless of the re-calibration interval, the torque wrench needs to be recalibrated if it has been subjected to an overload, repaired, or used incorrectly and could have an impact on the measurement findings.

Calibration Equipment

Accurately calibrated torque testers are used by calibration facilities to calibrate wrenches. Torque control instruments are calibrated using these quality control instruments. In addition to having three operating modes (peak, initial peak, and track), modern torque testers can measure in both clockwise and counterclockwise directions and convert the reading to multiple torque units. The following elements make up torque testers:

Transducer

An electrical device called a torque transducer transforms torque into an electrical signal. Typically, this kind of transducer is made up of four Wheatstone bridge-style strain gauges. Since the transducer's electrical output is usually only a few millivolts, it must first be amplified by an instrumentation amplifier in order to be utilized.

Digital display

The torque value is computed from the measured output signal from the transducer using the digital display, and the result is shown on the screen. Most of the time, a single housing houses both the transducer and the display.

Joint Simulator

Torque tool testing is aided by the joint simulator during the calibration process. The transducers are positioned beneath the joint simulator. The joint simulator may simulate mild, medium, or hard joints by using various spring kinds.

Calibration Method

It is necessary to calibrate torque wrenches in the appropriate environmental settings. This is what ISO 6789:2003 defines. The temperature should be between 18 and 28 degrees Celsius, with a maximum relative humidity of 90%. During the calibration, the temperature shouldn't fluctuate by more than 1 oC. Control, observation, and documentation of the calibration's environmental conditions are required.

Prior to starting the calibration, the torque wrench undergoing examination must have sufficient time to acclimate to the laboratory conditions.When using type I torque indicator tools, you must first pre-load the tool up to its maximum value in the direction of operation you want to test. Then, you must release the load and reset the pointer or electronic indication to zero. This process must be performed in order to test in any other working direction.

For setting torque tools (type II), prior to testing, five releases without measurement must be carried out at the maximum value (nominal capacity of the torque tool) in the operating direction to be tested. For testing in any other operating direction, this procedure shall be repeated.

Torque wrenches are calibrated at the values of 20%, 60% and 100% of their maximum value (or of the nominal value in case if type II, class B or E wrenches).

The number of readings in each direction must be as follows:

• Type I (all classes): 5 readings for each measurement point.
• Type II (classes A, D and G): 5 readings for each measurement point.
• Type II (classes B and E): 5 readings at nominal value.
• Type II (classes C and F): 10 readings for each measurement point.

Example: For the calibration of a click type torque wrench with a range of 0 – 100 N×m, the following measurements must be performed:

Before starting the calibration the torque wrench must be set five times to 100 N×m.

During the calibration the torque wrench must be tested at the following measurement points:

20%: 20 N×m (5 readings)

60%: 60 N×m (5 readings)

100%: 100 N×m (5 readings)

The tolerance of this click type torque wrench in the specific test points (> 10 N×m) is ± 4 %. So, the readings at 20 N×m must be between 19.2 N×m and 20.8 N×m, at 60 N×m must be between 57.6 N×m and 62.4 N×m and at 100 N×m must be between 96 N×m and 100 N×m.

Torque wrenches are generally well used mechanical devices that require regular calibration. Imagine an aircraft that has been manufactured with a torque wrench that does not tighten bolts to the correct specification!

Types of Torque Tools

We offer calibration on the following torque equipment and torque tools

TORQUE SCREWDRIVERS,

TORQUE WRENCHES,

Up to 2,500 Nm,

BEAM TORQUE WRENCHES,

CLICK TORQUE WRENCHES,

DIAL TORQUE WRENCHES,

DIGITAL TORQUE WRENCHES,

Cable Tensiometer Verification,

Pull Teste,r

Push Pull Tester,

Torque Multiplier,

Snap On Torque Wrench,

Torque Meter,

Torque Driver,

Digital Torque Wrench,

Torque Multiplier,

Hydraulic Torque Wrench,

Torque Equipment,

Torque Ratchet,

Pneumatic Torque Wrench,

NorTorque,

Industrial Wrenches,

Professional 650 - 1500 Series,

Professional Model 5,

Tethered Torque Wrench,

ProTronic Plus Electronic Torque Screwdriver,

NorTronic,

ProTronic Plus Model 10 & 30,

Electronic Torque Wrenches,

Battery Torque Tools,

Pneumatic Torque Tools,

PTS Series,

PTM Series,

PT Standard Series,

Electronic Torque Multiplier Accessories,

EvoTorque 2,

Calibration Beams & Weights,

Ultrasonic Bolt Measurement,

Products Services Projects,

Go Back,

Cylinders,

HVL Range,

HPS Range,

HLS Range,

HSS Range,

HHS Range,

HHR Range,

HDA Range,

HFL Range,

HFG Range,

HAS Range,

HHA Range,

HFA Range,

HRA Range,

HGG Range,

HSG Range,

HPC Range,

PCS Sets,

Cylinder Saddles and Piston Rod,

Pumps,

HP Range – Steel,

HP Range - Aluminium

HP Range - High Flow

HPX Range

HP-FP Range,

BPP Range,

HEP1 Range,

HEP103 Range,

HEP2 Range,

HEP3 Range,

HEP4 Range,

HEP5 Range,

HSP Range,

SLF Range,

SLV Range,

AHP11 Range,

HAP Range,

HPP Range,

Jacks,

JAS Range,

JAH Range,

JCS Range,

JCH Range,

HMJ Range,

ToughLift Jacking Systems,

TL Range,

ToughLift Accessories,

Torque Tools,

TWM Range,

HTW Range,

TWG Range,

TWP Range,

TWS-N Range,

IS Range,

MS Range,

TWS-N Accessories,

TWH-N Range,

TWH-NRH Range – Imperial,

TWH-NRH Range – Metric,

TWH-N Accessories,

IB Range,

MB Range,

BW Range,

HTWP Range,

TPA Range,

TPE Range,

IP Range,

FRL Range,

Torque Wrench Pump Accessories,

Bolt Tensioners,

Imperial Bolt Tensioners,

Metric Bolt Tensioners,

Special Design,

Pumps & Accessories,

Nut Splitters & Flange Spreaders,

NS Range,

HMNS Range,

DNS Range,

HFS-H Range,

HFS & HFS-TK Range,

MFS Range,

JS Range,

SJS Range,

Hydrotest Pumps,

MHX Range,

MHX-PU Range,

AHP Range,

AHP-CR Range,

AHP2 Range,

AHP2-CR Range,

ATDP Range,

Puller Kits,

SCP Range,

ACP Range,

PKS Range,

PKC Range,

HBR Range,

HPR Range,

Crimpers & Cutters,

CH Range,

SC Range,

BC Range,

HCH Range,

CT Range,

HWC Range,

HSWC Range,

HWRC Range,

HCC Range,

Go Back,

Skates,

RKT Range,

RKF Range,

RSN Range,

RSA Range,

RSG Range,

RSD Range,

Presses,

HPF Range,

Speciality Tools,

HHP Range,

HKP Range,

PB Range,

Tool Boxes,