Torque bolt. Refer to the charts to find the ideal tightening torque.
- Torque bolt. Mar 22, 2025 · This article provides the information for choosing the correct bolt tightening torque for standard bolt sizes with Chart + Calculator. Grade 2 bolts are cheap but not very strong, grade 8 bolts are the strongest and most expensive, and grade 5 bolts are the most common. These torque specs are to be used on clean, dry threads. This table is offered as the This fastener bolt torque calculator will Estimate the unknown torque, diameter, axial force applied and coefficient of turning friction for the given conditions. Most torque tightened joints do not use washers because their use can result in relative motion between the nut and washer or the washer and joint surface during tightening. US Recommended Bolt TorquePrint this page Torque Specs by Bolt Size and Grade General Torque Specification Guide If you need to torque a critical fastener and you can't find a manufacturer's torque spec, you can use the charts below for the maximum recommended torque values for different grades and sizes of fasteners. The tightening torques below are for imperial U. It is recommended that the induced stress not be allowed to exceed 80% of the yield strength. This article provides such a chart for "Initial Target These estimated torque values are derived from the standard torque formula Torque = KDF utilizing a standard "free-spinning" nut (non-locknut) with a proof strength equal to or greater than the tensile strength of the bolt. Jul 9, 2022 · Use this bolt torque calculator to help you determine the proper bolt torque for your threaded fasteners to meet your required clamping force. Refer to the charts to find the ideal tightening torque. Find more information on Dec 28, 2023 · Torque is a critical measurement in the fastener world. The shaft Recommended bolt torques. 8, 10. Whether you’re building a bridge, assembling machinery, or changing a tire, it’s important to know how to properly torque bolts to ensure they hold up under stress and vibration. Truthfully, product information rarely supplies torque values. The corresponding values for the various screw sizes and strength classes for metric coarse threads can be found in the metric torque table below. The primary challenge is accounting for environmental factors, coatings, and a number of other variables including surface texture, material hardness, and thread series. Correct torque is critical in ensuring the bolt holds its load securely without damage or failure. 9 bolts for both wet and dry tightening. May 29, 2025 · Accurately calculate bolt tightening torque to ensure secure fastening and prevent joint failure with our easy-to-use torque calculation guide. We would like to show you a description here but the site won’t allow us. Learn how to prevent over/under-torquing, overcome friction & ensure safe, durable bolted joints. Torque Table Standard Bolt Sizes SAE Torque Design Menu Torque-Force Calculator Torque Conversion Calculator Torque Table The following suggested tightening torques provide an excellent starting point for determining torque requirements. Find recommended tightening specs by diameter and grade, including common sizes like M8 and M12. Bolt Torque Calculator The calculator below can be used to calculate the torque required to achieve a given axial bolt force or load. The classes are set by the International Standards Organisation or ISO. Achieve accurate results for any application. The figures in this chart are safe figures for standard torque applications only. Bolt Torque Chart showing suggested torque values and corresponding bolt clamping forces for various sizes and specifications of fasteners. Oct 25, 2024 · Bolt torque refers to the twisting force applied to a bolt, nut or screw to achieve the necessary tension in a joint. Bolt torque chart reference guides include Grade 2, B7, A307, A325, Grade 8, A490, and Grade 5. Fastener Torque Determining the proper torque for a fastener is the biggest problem in fastener installation. MIL-HDBH-60 Design Considerations The first requirement in determining the amount of torque to apply is a knowledge of the desired bolt stress. Jun 12, 2025 · Bolt torque refers to the rotational force required to tighten a bolt to a specified level, measured as force multiplied by distance. Cross-reference the bolt size and grade to find the recommended torque value. 9, and 12. Our bolt torque calculator supports different bolt materials and levels of lubrication Bolts are used in countless applications, from construction and manufacturing to automotive and aerospace industries. What Is the Bolt Torque? A bolt is a fastener that consists of a shaft and a head. -lbs. Jun 6, 2025 · The Fastener Torque Calculator is a precise engineering tool used to determine the correct torque needed to tighten a bolt or screw to achieve the desired clamping force. In this article, we’ll cover everything you need to know about bolt torque, including why it The tightening torque is the force used to tighten the metric fasteners during assembly with a tool. Find recommended torque values and fastener guides at Dultmeier Sales. In the design of a fastener application Maximum tightening torques for coarse threaded metric bolts. Learn how to calculate the appropriate amount for your application. This has the efect of changing the friction radius and hence afects the torque-tension relationship. Determine the correct torque for bolts to ensure proper tension and safety in construction. Jul 22, 2021 · While tightening, or applying torque, to a bolt, the clamping force clamps the parts with a tremendous amount of force that will ideally remain very high and consistent. See the reference section for details on the methodology and the equations used. ) or foot-pounds (ft-lb). Read on to discover what is bolt torque, the bolt tightening torque calculation formula, how to calculate bolt torque, and typical torque values for bolts. Following the correct tightening sequence helps distribute torque evenly and reduces wear and deformation risks. Many times I have been asked if a chart is published on the recommended tightening torque for various bolt grades and sizes. The bolt’s class indicates its material strength, with higher numbers meaning higher tensile and yield strength. ** Fine thread figures are for 1-14. In Brief: SAE Bolt Torque Chart – Grade 2, Grade 5, Grade 8 SAE bolt grades indicate the strength of the bolt. By inputting values such as the bolt diameter, desired preload Oct 14, 2024 · Flange bolt torque technology involves controlling the tightening force through preset torque values ensuring uniformity and repeatability in bolt connections. The chart provides torque specifications in inch-pounds (in. bolts with tension approximately 70% of yield strength. Jun 30, 2025 · Explore our bolt torque chart for metric bolts. This fastener bolt torque calculator will Estimate the unknown torque, diameter, axial force applied and coefficient of turning friction for the given conditions. Without the return force of the compressed substrates, the bolt is solely relied upon for joint assembly—a condition that inevitably leads to joint failure. This bolt torque calculator will ensure that you tighten up your bolts with the correct torque. Some of the many variables causing problems are The coefficient of friction between mating threads The coefficient of friction between the bolthead (or nut) and its mating surface The effect of bolt coatings and lubricants on the friction coefficients The percentage of bolt tensile U. These metric bolt torque charts show the ideal tightening torque for class 8. Discover essential torque specifications with our comprehensive Bolt Torque Chart. com. If washers are to be used, hard washers Jun 5, 2025 · Understanding how to measure torque on a bolt involves using the correct tools, such as a calibrated torque wrench, and adhering to specified torque values and tightening patterns. Durability: Prevents over-tightening, which can damage bolts or threads, or under-tightening, which can cause loosening. The torque figures for a finely-threaded fastener as compared to a coarsely-threaded fastener of the same diameter may be slightly higher but hardly worth mentioning. Remember, you may need to vary these numbers somewhat based on the individual joint or the amount of fastener lubrication. CAUTION There are many varying factors which affect torque. S. For other applications or questions, e-mail engineer@fastenal. Dec 15, 2023 · Torque is a difficult value to calculate accurately, especially for construction fasteners and should be used cautiously. Each bolt grade has an ideal tightening torque for maximum clamping force without breaking. AFT Fasteners is your trusted source for fastener information. Importance of Bolt Torque Calculation Calculating the correct bolt torque is crucial for: Safety: Ensures bolts are tightened to hold components securely without failure. Torque values for various grades and diameters of fasteners. In this article, we’ll share the metric and imperial bolt torque chart with you, and also introduce torque measurement, calculation, and the differences between torque and tension. This stress based on the yield strength of the bolt material. The tension is 85% of the proof load. View our Belleville Washer torque calculator formula & learn how to calculate torque to ensure that your application is functional & safe. The calculator is generic an can used for imperial and metric units as long as the use of units are consistent. So, how to ensure the correctness of the torque? Oct 4, 2020 · Bolt head/Wrench size to bolt diameter conversion chart: Standard recommended torque spec for each size bolt: Conversion factor based on bolt condition (reduce by 30% for heavily greased [anti-seized] bolts): Coefficient factor indicates bolt condition (k factor indicates dry, vs lubed, vs greased, etc), koken chart is based Bolt Elongation by Turn Formulas and Calculator per. Simplify your bolt tightening process with our Bolt Torque Calculator. There are three important factors in understanding and finding the recommended max torque for your bolt: bolt size, bolt grade and friction. Recommended Bolt Torque Table * Sizes from 4 to 10 are in in. This calculation is crucial in mechanical and structural applications, as improper torque can lead to joint failure, component loosening, or even material damage. K -constant d - diameter of bolt (m, ft) F - axial bolt force or load (N, lbf) Jun 12, 2025 · How much torque is required for a bolt? To save time for calculation and variation, a torque value table is useful. It is used to create secure fastening, evenly distribute stress to reduce fatigue. The calculator below can be used to calculate the torque required to achieve a given axial bolt force or load. This chart displays values for lightly oiled threads. Our bolt torque calculator supports different bolt materials and levels of lubrication. Where a larger bearing face is required then flange nuts or bolts can be used. The Bolt Torque & Preload calculator can be used to calculate the torque required to achieve the desired preload on a bolted joint. I do not know of any. Jul 9, 2025 · Master bolt torque with our charts, calculators & expert guide. . What is the Proper Torque to Use on a Given Bolt by Joe Greenslade "What torque should I use to tighten my bolts?" is a question suppliers of bolts are frequently asked by end user customers. This torque is transmitted to the metric fasteners using an adjustable, suitable torque wrench. 3. Sizes from 1/4 up are in ft. Just as well, as a loose bolt can really ruin your day. How to Determine Proper Torque to Bolt Ratio Even experienced tradesmen over-or under-torque bolts. urdoc eymx jwxqhi bpsnmhl fwb velqu iqwyd czadc qruyvde qdgdv