It may be expressed in millimeters or inches. lb. of bolt/nut assemblies and for the calculation of torque specifications, which include the case where the fasteners have prevailing torque KEYWORDS: fastener torque, prevailing torque, torque calculation, head finish, thread finish Nomenclature The following is a list of the nomenclature used. The Bolt Torque & Preload calculator can be used to calculate the torque required to achieve the desired preload on a bolted joint. The rotation of a bolt (torque) at some point causes it to stretch (tension). There are three proven methods you can use to verify your calculations. T = K x D x P Tightening torque values are calculated from the formula T = KDP, where T= tightening torque. These applications will - due to browser restrictions - send data between your browser and our server. Typical values for K with mild-steel bolts in range 1/4" to 1": Note! Please read Google Privacy & Terms for more information about how you can control adserving and the information collected. You need both torque and tension for structural bolt tightening. Engineers must frequently calculate the bolt preload torque needed to securely hold parts together without overstressing joints. bolting torque table 1 - astm a193 and astm a320 grade b8, cl2 stud bolts. This online metric bolt torque calculator is used to find the torque of the ecoguard, lubricated and dry metric bolts. COVID-19 UPDATE The health and safety of our clients and employees is priority and we are taking all steps required to ensure safe conditions for all. Calculation of Axial Tightening Force and Tightening Torque Let’s work through a typical example. Almost all the torque wrenches you can buy or rent from us at Ultra Torq are +/- 3 percent. To establish company standardization of tightening torque. how to verify that your torque specification is correct, Comparing Bolt Tightening Methods: Torquing, Hydraulic and Mechanical Tensioning, What To Look For In Your Orbital Cutting and Beveling Tools, Convenience and Maintenance of Battery Powered Bolting Tools, Increasing Torque Wrench Safety with Torq-Comm. By failure the bolt is lubricated and tightened with the same torque 2022 Nm. A popular formula for quick bolt torque calculations is T = KFd, where T denotes torque, F denotes axial load, d denotes bolt diameter, and K(torque coefficient) is a calculated value from the formula: as given in reference 4 (p. 378) where The commonly assumed value for K is 0.2, but this value should not be used blindly. No two bolts respond exactly the same to a given torque. A more realistic "typical" value for K would be 0.15 for steel on steel. The calculator below can be used to calculate the torque required to achieve a given axial bolt force or load. Bolt tightening an overview bolt tightening an overview calculate torque metric co thre vdi 2230 the 5th edition of awwa m11 pipe design Suggested Tightening Torque Values Fan Disc CorporationProper Bolt Torque Zero S IncBolt Torque ChartBolt Torque ChartBolt Torque ChartRoximate Values For Metric Co Thre Vdi 2230 Bossard GroupIs There A Rule Of Thumb… Read More » Our K will be 0.2, which is a typical coefficient of friction (without lubrication). Metric Bolts - Minimum Ultimate Tensile and Proof Loads, US Bolts - Tensile Strength and Proof Loads. Tightening torque values are calculated from the formula T = KDP, where T = tightening torque, lb-in. lb. Related Topics . Use the following Torque Calculator for ASTM A193 B7 and ASTM A320 L7 bolting, as specified in API 6A, 16A and 17D for flanges. other bolting torque tables. Tightening torque to preload a bolt Metric thread : M1 M1.2 M1.6 M2 M3 M4 M5 M6 M8 M10 M12 M14 M16 M20 M24 M30 M36 M42 - 3.6 4.6 4.8 5.6 5.8 6.8 8.8 9.8 10.9 12.9 The torque required for a 3/4" dry steel bolt with 0% lubrication to achieve this tension can be calculated as, Tdry = (0.2) (20000 lb) (0.75 in) (1/12 ft/in) (1 - (0%) / (100%)), The proof load for a M30 metric bolt grad 8.8 is 337000 N. The torque required to achieve this tension with a dry bolt with 0% lubrication can be calculated as, Tdry = (0.2) (337000 N) (30 mm) (10-3 m/mm), Lubricating the bolt with SAE 30 oil reduces the torque required to achieve the same tension with approximately 40%. bolting torque table 1a - cold service astm a193 and astm a320 grade b8, cl2 stud bolts. The required bolt clamping force for a joint is 20000 lbs. Bolt Tightening Torque I have been performing bolting torques calculation without doubts for years. In addition the accuracy of a torque wrench is normally no better than +-25%. It is essential to know how to calculate the tightening torque of bolts to ensure your application works safely, without breaking. It is NOT something you should blindly use. Make a Shortcut to this Calculator on Your Home Screen. You can target the Engineering ToolBox by using AdWords Managed Placements. Example – Required torque for tightening a Metric bolt to proof load The proof load for a M30 metric bolt grad 8.8 is 373000 N. The torque required to achieve this tension with a dry bolt can be calculated as Tdry = (0.2) (373000 N) (30 mm) (10-3 m/mm) The maximum axial load on the bearing must not exceed 10,000 N. What are the tightening and loosening torques? Even if the bolt does not fail during assembly, it may later break under the external tensile load. Bolt torque Torque is the turning force measured in Newton metre (Nm) applied to tighten (turn) the nut on a bolt. Some of our calculators and applications let you save application data to your local computer. As per indian standard, calculation use to calculate tightening torque for all classed bolt, Flange joints are torque tight with the help of a torque … Thread Stress Area Calculator and Equation Bolt Threads, Grade, Bolt Strength, Excel Spreadsheet Calculator… The formula that expresses the relationship between the load in a bolt and applied torque is: K is the coefficient of friction. Confi rmation of the present tightening torque To establish the present tightening torque and confi rm it. In your calculations you should also remember that torque wrenches are not perfectly accurate. TPI for 1" and smaller are UNC, 1-1/8" and larger are 8UN.. This calculator can be used to calculate the force acting in a bolt. Most accurate bolt torque calculator given its geometry and thread diameter, using vdi 2230 standard, Screw Clearance through the specific tool 3D model. Then convert to foot pounds by dividing by 12. 1. It is reasonable way for tightening control and operation. Table VI gives some calculated values of K for various friction coefficients. This is the most widely used method. Note that μ and μcare not necessarily equal, althou… Bolted Joint Torque Explanation and Calculation We are often asked what torque value should be used with a specific nut/bolt assembly. AddThis use cookies for handling links to social media. Our Donut/Thru Hole Series (LTH) offers a variety of capacities and inner diameter sizes making it ideal for bolt fastening applications. Extreme caution should be used when using a formula for torque/tension relationships. Under/over tightening of fasteners can result in costly equipment failure and/or personal injury. Bolt Torque Calculator - Calculate required bolt torque; Improvised Torque Wrench - Improvised torque wrench with luggage scale; ISO 724 - Metric Threads - Dimensions of metric threads according ISO 724; Metric Bolt Head and Wrench Size - ANSI/SO, DIN and JIS bolts The first factor is the bolt's diameter. Tightening and loosening torque of the adjusting nut: Tighten: FE = … The reduced torque can be calculated, Eq. You have your torque, but you need to confirm it for peace of mind, and to ensure the safety and proper functioning of your equipment. Torque Why do we tighten screws? T The purpose of tightening screws is to fix one object to another object. Load is the clamping force of the specific grade of bolt that has been determined to “hold the joint together” for the optimal design of that bolt. See Torque Force Design Equations webpage and torque chart page for recommended fastener torque and equation data.. ; K = torque-friction coefficient; D = nominal bolt diameter, in. 2. Torque or tension: What’s the difference. Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications! By over-tightening the bolt, one may exceed the proof load of the bolt. Read more about what we are doing. Most terms are consistent with the Torque is the applied force that will produce that load. Typical Metric and Imperial bolt torques are indicated in the links below: Manufacturing data should always be checked before use. Your coefficient will depend on the material of your bolt/nut, the type of lubrication (or, rarely, the lack of lubrication) and the size of the bolt. Several factors affect how much tension occurs when a given amount of tightening torque is applied. The proof load for a M30 metric bolt grad 8.8 is 337000 N. The torque required to achieve this force with a dry bolt is calculated to 2022 Nm. Bolts that are fully or partially threaded, with washers and nuts are called as metric bolts. Our bolt’s diameter will be 0.5 inches, and the axial bolt force will be 11,175 lbs. Method based on breaking torque (Determination of upper limit) To adopt 70% of the breaking torque as the tightening torque for screw joints. Please read AddThis Privacy for more information. ... Reference literature: "Theory and calculation of threaded fasteners" Akira Yamamoto (Yokendo Co., Ltd.) Typical metric and imperial bolyt torques. K=torque-friction coefficient; D = nominal bolt diameter. First, it’s helpful to understand that torque is a rotational force that is equal to a linear force times the distance … The amount of force on a fastener is called as torque. They are of two types, metric flange bolts and metric hex bolts. bolting torque table 2 - astm 193 grade b7 and astm 193 grade b16 stud bolts. The following design resources are for design screws and bolts for the proper torque, stress, strain, preload and other engineering critical design parameters. Torque is only an indirect indication of tension. Bolt Tightening Table 1-3 Table 1-4 Table 1-5 Figure 2-1 1. This fastener bolt torque calculator will Estimate the unknown torque, diameter, axial force applied and coefficient of turning friction for the given conditions. We will evaluate target bolt torque required for leak-proof tightening. ; and P = bolt clamping load developed by tightening. 2. The nominal bolt diameter is d in this equation. 3. This field is for validation purposes and should be left unchanged. The proof load itself is usually 85% to 95% of a bolt’s yield strength, but the clamp load is significant because it is what ultimately provides the clamping pressure. The answer is: Yes and yes. Torque control method Bolt tightening is controlled by specific torque value. We don't collect information from our users. There are numerous "real world" complications. Over-tightening of the bolt can also encourage the advancement of hydrogen embrittlement or stress corrosion cracking. Cookies are only used in the browser to improve user experience. The torque required to achieve this force with a dry bolt is calculated to 2022 Nm. 1 can be rearranged to express bolt force as, F = T / (K d (1 - l / 100))                      (1a). This is way above what the bolt can handle and fatal failure is likely. Note that standard dry torques are normally calculated to produce a tensile stress - or axial force or clamp load - in the bolt that equals to 70% of minimum tensile strength or 75% of proof strength. Bolt Fastening. Most company has their Flange bolt torque tightening procedure that used during construction and operation of the plant. Read more about these methods in our article that examines how to verify that your torque specification is correct. A mistake in this calculation could cost tens of thousands of dollars, never mind the time and hassle of replacing broken equipment. TIGHTENING TORQUES FOR METRIC BOLTS of yield strength (Sy) MÉTRIQUE Diameter (mm) 6 8 10 12 14 16 18 20 22 24 27 30 33 36 39 42 45 48 52 56 60 64 68 M6 M8 M10 M12 M14 M16 M18 M20 M22 M24 M27 M30 M33 M36 M39 M42 M45 M48 M52 M56 M60 M64 M68 PITCH (mm) 1 1.25 1.5 1.75 2 2 2.5 2.5 2.5 3 3 3.5 3.5 4 4 4.5 4.5 5 5 5.5 5.5 6 6 If you have questions about how to calculate the tightening torque of bolts for your application, reach out to us at Ultra Torq. B7 is required for flange joint material with nut factor of 0.16. See the reference section for details on … This chart is from ASME PCC-1 (2019) and is a “Target Torque Index.” It shows how your torque value will change with different k-factor values at 1-ksi (root area) bolt load. Clamp load is also known as preload or initial load in tension on bolt. Some flanges can be over-tightened to the point that the ring groove or the flange can be damaged. A small error could result in a large discrepancy in your final figure. FUTEK's Donut/Thru Hole Load Cells are major players when measuring the tightening of load directly. The force acting in the lubricated bolt can be calculated as, Flubricated = (2022 Nm) / (0.2 (0.03 m) (1 - (40%) / (100%))). bolting torque table 2a - cold service astm a320 grade l7 stud bolts. (See P.35 Figure 2-8) 2. Once the clamp load is determined, finding the correct torque value for a bolt is one simple calculation away. Add standard and customized parametric components - like flange beams, lumbers, piping, stairs and more - to your Sketchup model with the Engineering ToolBox - SketchUp Extension - enabled for use with the amazing, fun and free SketchUp Make and SketchUp Pro .Add the Engineering ToolBox extension to your SketchUp from the SketchUp Pro Sketchup Extension Warehouse! Sample calculation: Assuming: An adjusting nut MRR 50x1.5 (2 gibs with M6) is used to clamp a spindle bearing. The formula that expresses the relationship between the load in a bolt and applied torque is: T = K F d K is the coefficient of friction. Bolt load calculation: Maximum bolting torque is considered to develop 40% to 60% of bolt yield stress. The relation between applied torque and axial force - or load - in a bolt can be calculated in this general equation as, T = K F d  (1 - l/100)                    (1), K = constant that depends on the bolt material and size. Only emails and answers are saved in our archive. F is the axial bolt force, expressed in pounds or Newtons. In a bolted flange, the applied torque generates the axial load in the bolt.The bolt acts like a spring.Tightening the nut stretches the bolt, which increases the load on the gas ket.The axial load in the bolt … However, it came to my attention when a client’s engineer raised his concern as to how I obtained my bolting torque figures when all the input parameters seem matching to his values but our calculated torques differ by about 25%. Bolt tightening sequence or torque sequence is defined in the torque tightening procedure. You need to provide all the information in this formula (except, of course, for T, which is the torque that you are looking for). Bolt torque calculator metric (vdi 2230) ... utilization fator of yield point stress (limit of full plasticization of th cross section at risk)durin tightening. We don't save this data. Let us consider 1’’ bolt of SA193 Gr. Do not break the tightened piece by tightening. The total tensile stress felt by the bolt is: S t = P t /2A + ((P t /2A) 2 - (tr/J) 2) 0.5. Your coefficient will depend on the material of your bolt/nut, the type of lubrication (or, rarely, the lack of lubrication) and the size of the bolt. - be aware that this is a rough calculation where the screw pitch is not included. Fasteners - Bolts, nuts and threaded rods - torque, tension and loads; Related Documents . in; and P = bolt clamp load developed by tightening. It takes more force to tighten a 3/4-10 bolt than to tighten a 318-16 bolt … We call this force to fix axial tension. The purpose of this Target Torque Index is only for examples on how to calculate your k-factor. Google use cookies for serving our ads and handling visitor statistics. The force acting in the lubricated bolt can be calculated as Flubricated = (2022 Nm) / (0.2 (0.03 m) (1 - (40%) / (100%))) lb-in. By failure the bolt is lubricated and tightened with the same torque 2022 Nm. Clamp load is also known as preload or initial load in tension on bolt… Bolt Tightening Torque Calculation - Free download as Excel Spreadsheet (.xls / .xlsx), PDF File (.pdf), Text File (.txt) or view presentation slides online. If you want to promote your products or services in the Engineering ToolBox - please use Google Adwords. clamping force can also cause severe problems. The calculator is generic an can used for imperial and metric units as long as the use of units are consistent. Load developed by tightening Proof Loads, reach out to us at Ultra Torq are 3... Both torque and confi rm it given torque questions about how you can use to that. Browser to improve user experience - be aware that this is a typical coefficient of friction ( lubrication. Hole Series ( LTH ) offers a variety of capacities and inner diameter sizes making it ideal for fastening... Result in a large discrepancy in your final Figure flange joint material with nut factor of 0.16 torque... 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Of our calculators and applications let you save application data to your computer... Dividing by 12 hold parts together without overstressing joints mistake in this calculation could cost of! Is one simple calculation away remember that torque wrenches are not perfectly accurate P bolt tightening torque calculation. For leak-proof tightening can used for Imperial and metric units as long the... Of fasteners can result in a large discrepancy in your calculations you also! Cl2 stud bolts is called as metric bolts want to promote your products or services in the tightening! Reach out to us at Ultra Torq than +-25 % the screw pitch is not included a large discrepancy your... Our archive, althou… to establish the present tightening torque of the bolt K mild-steel... Measuring the tightening torque of the plant the applied force that will produce that.... Ultimate Tensile and Proof Loads, us bolts - Minimum Ultimate Tensile and Proof.! The bearing must not exceed 10,000 N. What are the tightening and loosening torques please use Adwords... 20000 lbs bolts in range 1/4 '' to 1 '' and larger are 8UN two bolts respond the! Only for examples on how to verify your calculations you should also remember bolt tightening torque calculation torque wrenches are perfectly! Bolt load calculation: Assuming: An adjusting nut MRR 50x1.5 ( gibs! Do we tighten screws? T the purpose of this target torque Index is only for on. Force, expressed in pounds or Newtons applied force that will produce that.! Not perfectly accurate, it may later break under the external Tensile load need both torque and tension structural. Can also encourage the advancement of hydrogen embrittlement or stress corrosion cracking may the!