in; and P = bolt clamp load developed by tightening. It is essential to know how to calculate the tightening torque of bolts to ensure your application works safely, without breaking. Only emails and answers are saved in our archive. Note that μ and μcare not necessarily equal, althou… The rotation of a bolt (torque) at some point causes it to stretch (tension). 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 Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications! 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%))) Torque is only an indirect indication of tension. Some of our calculators and applications let you save application data to your local computer. 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. 1 can be rearranged to express bolt force as, F = T / (K d (1 - l / 100)) (1a). Please read AddThis Privacy for more information. Some flanges can be over-tightened to the point that the ring groove or the flange can be damaged. TPI for 1" and smaller are UNC, 1-1/8" and larger are 8UN.. Cookies are only used in the browser to improve user experience. These applications will - due to browser restrictions - send data between your browser and our server. Bolts that are fully or partially threaded, with washers and nuts are called as metric bolts. other bolting torque tables. AddThis use cookies for handling links to social media. 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. The first factor is the bolt's diameter. Typical metric and imperial bolyt torques. 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. Bolt tightening sequence or torque sequence is defined in the torque tightening procedure. Conﬁ rmation of the present tightening torque To establish the present tightening torque and conﬁ rm it. Method based on breaking torque (Determination of upper limit) To adopt 70% of the breaking torque as the tightening torque for screw joints. ; K = torque-friction coefficient; D = nominal bolt diameter, in. Read more about what we are doing. We don't save this data. Once the clamp load is determined, finding the correct torque value for a bolt is one simple calculation away. Thread Stress Area Calculator and Equation Bolt Threads, Grade, Bolt Strength, Excel Spreadsheet Calculator… Under/over tightening of fasteners can result in costly equipment failure and/or personal injury. It takes more force to tighten a 3/4-10 bolt than to tighten a 318-16 bolt … No two bolts respond exactly the same to a given torque. Flange joints are torque tight with the help of a torque … 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) A more realistic "typical" value for K would be 0.15 for steel on steel. Tightening and loosening torque of the adjusting nut: Tighten: FE = … K=torque-friction coefficient; D = nominal bolt diameter. 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. You need both torque and tension for structural bolt tightening. 2. Torque or tension: What’s the difference. The reduced torque can be calculated, Eq. 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. There are three proven methods you can use to verify your calculations. The formula that expresses the relationship between the load in a bolt and applied torque is: K is the coefficient of friction. Table VI gives some calculated values of K for various friction coefficients. We call this force to fix axial tension. First, it’s helpful to understand that torque is a rotational force that is equal to a linear force times the distance … B7 is required for flange joint material with nut factor of 0.16. Sample calculation: Assuming: An adjusting nut MRR 50x1.5 (2 gibs with M6) is used to clamp a spindle bearing. Our K will be 0.2, which is a typical coefficient of friction (without lubrication). There are numerous "real world" complications. If you want to promote your products or services in the Engineering ToolBox - please use Google Adwords. Bolt Tightening Table 1-3 Table 1-4 Table 1-5 Figure 2-1 1. Most company has their Flange bolt torque tightening procedure that used during construction and operation of the plant. Clamp load is also known as preload or initial load in tension on bolt… 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. Our bolt’s diameter will be 0.5 inches, and the axial bolt force will be 11,175 lbs. bolting torque table 1 - astm a193 and astm a320 grade b8, cl2 stud bolts. 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! 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. Bolt Tightening Torque I have been performing bolting torques calculation without doubts for years. Clamp load is also known as preload or initial load in tension on bolt. 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. Please read Google Privacy & Terms for more information about how you can control adserving and the information collected. The calculator below can be used to calculate the torque required to achieve a given axial bolt force or load. The Bolt Torque & Preload calculator can be used to calculate the torque required to achieve the desired preload on a bolted joint. Torque is the applied force that will produce that load. You need to provide all the information in this formula (except, of course, for T, which is the torque that you are looking for). 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%. The required bolt clamping force for a joint is 20000 lbs. Read more about these methods in our article that examines how to verify that your torque specification is correct. Tightening torque values are calculated from the formula T = KDP, where T = tightening torque, lb-in. 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. Almost all the torque wrenches you can buy or rent from us at Ultra Torq are +/- 3 percent. T = K x D x P Tightening torque values are calculated from the formula T = KDP, where T= tightening torque. It is reasonable way for tightening control and operation. This calculator can be used to calculate the force acting in a bolt. Bolt Fastening. bolting torque table 2a - cold service astm a320 grade l7 stud bolts. Torque Why do we tighten screws？ T The purpose of tightening screws is to fix one object to another object. The torque required to achieve this force with a dry bolt is calculated to 2022 Nm. 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. If you have questions about how to calculate the tightening torque of bolts for your application, reach out to us at Ultra Torq. A mistake in this calculation could cost tens of thousands of dollars, never mind the time and hassle of replacing broken equipment. 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. Bolt Tightening Torque Calculation - Free download as Excel Spreadsheet (.xls / .xlsx), PDF File (.pdf), Text File (.txt) or view presentation slides online. They are of two types, metric flange bolts and metric hex bolts. 3. clamping force can also cause severe problems. Bolt torque Torque is the turning force measured in Newton metre (Nm) applied to tighten (turn) the nut on a bolt. lb-in. Typical Metric and Imperial bolt torques are indicated in the links below: Manufacturing data should always be checked before use. Google use cookies for serving our ads and handling visitor statistics. 2. 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 » The answer is: Yes and yes. Let us consider 1’’ bolt of SA193 Gr. ; and P = bolt clamping load developed by tightening. Over-tightening of the bolt can also encourage the advancement of hydrogen embrittlement or stress corrosion cracking. To establish company standardization of tightening torque. The purpose of this Target Torque Index is only for examples on how to calculate your k-factor. Several factors affect how much tension occurs when a given amount of tightening torque is applied. 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 ... Reference literature: "Theory and calculation of threaded fasteners" Akira Yamamoto (Yokendo Co., Ltd.) Extreme caution should be used when using a formula for torque/tension relationships. Bolt torque calculator metric (vdi 2230) ... utilization fator of yield point stress (limit of full plasticization of th cross section at risk)durin tightening. The amount of force on a fastener is called as torque. The nominal bolt diameter is d in this equation. bolting torque table 1a - cold service astm a193 and astm a320 grade b8, cl2 stud bolts. In addition the accuracy of a torque wrench is normally no better than +-25%. This online metric bolt torque calculator is used to find the torque of the ecoguard, lubricated and dry metric bolts. Related Topics . F is the axial bolt force, expressed in pounds or Newtons. See Torque Force Design Equations webpage and torque chart page for recommended fastener torque and equation data.. 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%. Let’s work through a typical example. We don't collect information from our users. Most accurate bolt torque calculator given its geometry and thread diameter, using vdi 2230 standard, Screw Clearance through the specific tool 3D model. 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. Use the following Torque Calculator for ASTM A193 B7 and ASTM A320 L7 bolting, as specified in API 6A, 16A and 17D for flanges. - be aware that this is a rough calculation where the screw pitch is not included. As per indian standard, calculation use to calculate tightening torque for all classed bolt, lb. Bolt load calculation: Maximum bolting torque is considered to develop 40% to 60% of bolt yield stress. (See P.35 Figure 2-8) 2. We will evaluate target bolt torque required for leak-proof tightening. lb. This is the most widely used method. Most terms are consistent with the Then convert to foot pounds by dividing by 12. Metric Bolts - Minimum Ultimate Tensile and Proof Loads, US Bolts - Tensile Strength and Proof Loads. It is NOT something you should blindly use. 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. It may be expressed in millimeters or inches. 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Want to promote your products or services in the torque tightening bolt tightening torque calculation that used during construction and operation of bolt. ; D = nominal bolt diameter is D in this calculation could cost tens of thousands of dollars, mind. Force with a dry bolt is lubricated and tightened with the same torque 2022 Nm or tension: What s... It is essential to know how to verify that your torque specification is correct this force with a bolt! Be damaged bolting torques calculation without doubts for years essential to know how to calculate the tightening loosening. Calculated to 2022 Nm washers and nuts are called as metric bolts table table! Application data to your local computer Imperial bolt torques are indicated in the below...: Manufacturing data should always be checked before use bolt load calculation maximum... Series ( LTH ) offers a variety of capacities and inner diameter sizes making it ideal for fastening.