The Voice of Torque Control TORQUE TOOL AND MEASUREMENT CATALOGUE

GENERIC Accuracy (%) Torque & Angle Digital Display Single Scale Dual Scale Multi Scale Calibration Certificate UKAS Accredited Certification Bluetooth Enabled Case Included SCREWDRIVERS & TORQUE WRENCHES Ratchet Adjustment Lock Torque Handle Calibration Certificate Anti Wind-up Ratchet Adjustable Reaction Lifting Attachment ProTronic® Electronic Torque Wrenches ProTronic® Plus Electronic Torque Wrenches ProTronic® Plus Electronic Torque Screwdriver ProTronic® Plus Model 10 and Model 30 ProTronic® Plus TorqApp™ NorTronic® Electronic Torque Wrenches TORQUE MEASUREMENT INSTRUMENTS Back-up Data...

INTRODUCTION ABOUT NORBAR - THE VOICE OF TORQUE CONTROL GLOBAL SERVICE We are the world’s leading specialist in torque control and we are engaged solely in the design, development and production of torque tightening and measuring equipment. Our customers include manufacturers and engineering services in such diverse sectors as aerospace, energy, oil and gas, mining and sub-sea. There are sales and service branches as shown above. In addition, we have distributors of our torque control products in more than 60 countries around the world. In our 2022 catalogue you will find the recently launched...

INTRODUCTION INTRODUCTION TO TORQUE What is Torque? Torque is any force or system of forces that tends to cause rotation about an axis. Measurement of Torque Imagine someone tightening a bolt using a socket attached to a meter (m) long bar. If they apply 10 kg of force (kgf) perpendicular to the bar they will produce a torque of 10 kgf·m at the axis (the centre of the bolt). However, under the S.I. system of measurement, force is expressed in Newtons (N) rather than kgf. The conversion between kgf and N is x 9.807 so the person is applying 98.07 N·m of torque. Torque = Force x Distance Example...

INTRODUCTION INTRODUCTION TO TORQUE Friction in the Bolted Joint When a threaded fastener is tightened, the induced tension results in friction under the head of the bolt and in the threads. It is generally accepted that as much as 50% of the applied torque is expended in overcoming friction between the bolt head and the abutting surface and another 30% to 40% is lost to friction in the threads. As little as 10% of the applied torque results in useful work to tension the bolt. Friction under the bolt head N.m Friction in the threads Useful work to tension bolt Given that up to 90% of the applied...

INTRODUCTION INTRODUCTION TO TORQUE Tightening to Yield Bolts tightened to yield provide consistently higher preloads from smaller diameter bolts. The reduced fastener stiffness reduces the fatigue loading to which the bolt is subjected under repeated external load reversals, e.g. cylinder heads and connecting rods. In theory, a bolt tightened to its yield point will provide the strongest and most fatigue-resistant joint possible, within the physical limitations of the bolt material and manufacturing process. The downside of this method is the cost of the sophisticated equipment necessary to...

INTRODUCTION INTRODUCTION TO TORQUE Recommended Maximum Torque Values The information supplied here is intended to be an acceptable guide for normal conditions. For critical applications, further information and research will be necessary. The following basic assumptions have been made: a. Bolts are new, standard finish, uncoated and not lubricated (other than the normal protective oil film) b. The load will be 90% of the bolt yield strength c. The coefficient of friction is 0.14 d. The final tightening sequence is achieved smoothly and slowly If lubrication is to be applied to the nut/bolt,...

INTRODUCTION INTRODUCTION TO TORQUE Torque Conversion Factors S.I. Units Imperial Units Metric Units FLOW I/s x 2.119 = cu·ft/min cu·ft/min x 0·472 = I/s Accepted formulae relating torque and tension, based on many tests are:For Imperial Sizes M = torque lbf·ft PxD M= P = bolt tension lbf 60 D = bolt diameter (ins) For Metric Sizes M = torque N·m PxD P = bolt tension Newtons M= 5000 D = bolt diameter (mm) These formulae may be used for bolts outside the range of the tables. Formula for Calculating the Effect of Torque Wrench Extensions M1 = M2 x L1/L2 Where L1 is the normal length and L2 is the...

SCREWDRIVERS AND TORQUE WRENCHES TORQUE SCREWDRIVERS AND TORQUE WRENCHES Norbar Torque Tools manufacture an extensive range of high quality torque screwdrivers and torque wrenches to cover torque values from 0.3 Nm to 2,000 Nm. They are designed and manufactured to exceed international standards for accuracy. In addition to the normal ‘adjustable’ torque wrenches, Norbar offer Production ‘P’ Type versions which can be pre-set and dedicated to a particular application. This setting system is designed to discourage unauthorised alteration. All Norbar torque wrenches are offered as standard with...

SCREWDRIVERS AND TORQUE WRENCHES ISO 6789:2017 Since 1993, ISO 6789 has been the international standard for “Assembly tools for screws and nuts – hand torque tools”. The standard now covers a range of topics guiding the design, marking, conformance testing and calibration of hand torque tools. As such, it is a key reference document for torque wrench manufacturers and those re-calibrating torque wrenches in the after sales market. While it is not primarily aimed at torque tool users, some users may benefit from understanding the parameters that torque wrench manufacturers are working to and the...

SCREWDRIVERS AND TORQUE WRENCHES ISO 6789:2017 How does it affect a torque tool user? If a current end user was previously content to buy a new torque tool and put it into service on the basis of the calibration certificate supplied with the tool by the manufacturer, then they can continue to do so after the standard changes, even though the new piece of paper is now called a declaration of conformance. If the end user’s quality control processes currently require a traceable calibration certificate issued by an accredited laboratory then they will already not accept the current manufacturer’s...