Use a torque wrench to accurately apply a specific torque value to a nut, bolt or other type of fastener. It is ideal for applications requiring precise and safe tightening for optimal machine performance.
A torque wrench is a precision measuring instrument Conrad Bahr invented in 1918. It is a socket wrench with special internal mechanisms that accurately measure torque, the amount of rotational force applied to an item.
Torque wrenches provide the tension level fasteners must achieve to tighten and ensure safe operational use. Manufacturers will specify the torque value you must apply to avoid overtightening or undertightening.
Torque wrenches come in various types to implement different industrial applications. They vary in size, capacity, ease of adjustment and how they read measurements.
Discover several types below.
This digital instrument features an electric sensor that indicates the force you apply on a digital display. It also has a chip that saves readings for easy access on a computer.
A beam torque wrench is a simple, easy-to-use tool. It features an analog scale that denotes the applied force.
This precise torque wrench clicks when you reach the preset torque setting. It features a limited laser cut scale, which you must read manually. Click wrenches take longer to read than their digital counterparts.
This tool uses hydraulics to achieve the desired torque value. It is ideal for applications requiring significant torque, such as manufacturing and aviation.
A mechatronic torque wrench incorporates digital technology and click-type features. It troubleshoots issues and offers more control during a job.
Considered one of the most accurate tools, the dial torque wrench is ideal for the defense, automotive and aerospace industries. It has a dial indicator to register the amount of torque applied.
A torque limiter features a clutch system that releases when the fastener’s resistance surpasses the clutch’s. It is suitable for lower-torque fasteners like bars, cable pinch bolts and stems.
You must calibrate a torque wrench to apply the desired torque amount to a fastener. The amount of torque depends on the length of the wrench and the magnitude of force you apply to its handle. Multiply force by the length of the wrench to determine the amount of torque. The formula looks like this: force x length = torque.
A torque wrench’s handle features an internal indicator that connects to a scale or display screen. When the scale registers the target torque, you should stop loosening or tightening the fastener.
Different torque wrench types use varying mechanisms to record torque. For instance, the click type uses a ball and spring mechanism, in which the spring is preloaded by an adjustable screw thread, and the force is applied to the ball. When the force applied by the spring is surpassed, the ball clicks out of its socket.
Experts calibrate torque wrench measurements to read in N-m (Newton-meter), ounce-force inch (ozf·in), pound-force inch (lbf·in.) or pound-force foot (lbf·ft.).
The purpose of a torque wrench is to accurately apply and measure the amount of torque on fasteners. These wrenches are utilized in different industries such as construction, automotive and manufacturing.
Engineers in these disciplines employ specific torque values during the design phase to tighten fasteners appropriately to maintain safety and reliability to reach desired performance parameters. Torque wrenches make everyday products and devices reliable and easy to use.
Explore how different industries use these precision tools.
Using a torque wrench is simple as long as you obtain the right type and apply the proper amount of force. Ensure an expert calibrates the tool for accuracy and the desired function before you start a job.
Once you have a calibrated wrench, set the desired torque value as follows:
Once you have locked in the torque value, proceed to the actual task.
To fasten a bolt correctly with a torque wrench, follow these steps:
To maintain a torque wrench, keep it clean, well-lubricated and away from moisture. These practices protect it from rust, corrosion and/or damage, which help achieve the maximum lifetime. For click-type wrenches, ensure the preloaded range is 20% or less when not in use, to prevent permanent compression of the spring, which can cause inaccuracies.
You should also have an expert calibrate the tool regularly to maintain reliability and precision. Scheduling routine calibration as part of your annual preventive maintenance will ensure optimal application, with downtime kept to a minimum. It is best to have your wrenches calibrated twice or even three times a year if your facility uses specific torque wrenches daily.
Other best maintenance practices for torque wrenches include:
Calibration is vital in the maintenance routine of torque wrenches, as it ensures dependable measurements. Since overtightening or undertightening fasteners considerably impacts application performance and safety, you must prioritize preserving torque wrench accuracy.
At Garber Metrology, we provide accurate and cost-effective calibration solutions in our state-of-the-art laboratories. We offer 40 years of experience and technical expertise to bring your torque wrenches up to par with industry standards. We are ISO 9001 Registered by NQA and ISO/IEC 17025 and ANSI/NCSL Z540-1-1994 Accredited by ANAB.
Call us at 717-393-1708 to discover more about our torque wrench calibration solutions.
