Clamp load is also known as preload or initial load in tension on bolt… (See P.35 Figure 2-8) 2. Read more about these methods in our article that examines how to verify that your torque specification is correct. The Bolt Torque & Preload calculator can be used to calculate the torque required to achieve the desired preload on a bolted joint. bolting torque table 1a - cold service astm a193 and astm a320 grade b8, cl2 stud bolts. Bolt Fastening. 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 … Bolt torque calculator metric (vdi 2230) ... utilization fator of yield point stress (limit of full plasticization of th cross section at risk)durin tightening. 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. Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications! Bolt Tightening Torque Calculation - Free download as Excel Spreadsheet (.xls / .xlsx), PDF File (.pdf), Text File (.txt) or view presentation slides online. Tightening torque values are calculated from the formula T = KDP, where T= tightening torque. See the reference section for details on … The force acting in the lubricated bolt can be calculated as, Flubricated = (2022 Nm) / (0.2 (0.03 m) (1 - (40%) / (100%))). To establish company standardization of tightening torque. 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. Thread Stress Area Calculator and Equation Bolt Threads, Grade, Bolt Strength, Excel Spreadsheet Calculator… Bolt torque Torque is the turning force measured in Newton metre (Nm) applied to tighten (turn) the nut on a bolt. Torque is the applied force that will produce that load. Tightening torque values are calculated from the formula T = KDP, where T = tightening torque, lb-in. The nominal bolt diameter is d in this equation. A mistake in this calculation could cost tens of thousands of dollars, never mind the time and hassle of replacing broken equipment. 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. Use the following Torque Calculator for ASTM A193 B7 and ASTM A320 L7 bolting, as specified in API 6A, 16A and 17D for flanges. 3. Typical metric and imperial bolyt torques. Make a Shortcut to this Calculator on Your Home Screen. Read more about what we are doing. 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. We don't save this data. 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 … Calculation of Axial Tightening Force and Tightening Torque Let us consider 1’’ bolt of SA193 Gr. Then convert to foot pounds by dividing by 12. Under/over tightening of fasteners can result in costly equipment failure and/or personal injury. By over-tightening the bolt, one may exceed the proof load of the bolt. This is the most widely used method. Related Topics . By failure the bolt is lubricated and tightened with the same torque 2022 Nm. 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. Torque Why do we tighten screws？ T The purpose of tightening screws is to fix one object to another object. Clamp load is also known as preload or initial load in tension on bolt. The formula that expresses the relationship between the load in a bolt and applied torque is: K is the coefficient of friction. It is reasonable way for tightening control and operation. Most company has their Flange bolt torque tightening procedure that used during construction and operation of the plant. lb. Once the clamp load is determined, finding the correct torque value for a bolt is one simple calculation away. Torque control method Bolt tightening is controlled by specific torque value. ; K = torque-friction coefficient; D = nominal bolt diameter, in. Some of our calculators and applications let you save application data to your local computer. other bolting torque tables. Google use cookies for serving our ads and handling visitor statistics. Fasteners - Bolts, nuts and threaded rods - torque, tension and loads; Related Documents . The maximum axial load on the bearing must not exceed 10,000 N. What are the tightening and loosening torques? The purpose of this Target Torque Index is only for examples on how to calculate your k-factor. By failure the bolt is lubricated and tightened with the same torque 2022 Nm. Let’s work through a typical example. clamping force can also cause severe problems. Typical Metric and Imperial bolt torques are indicated in the links below: Manufacturing data should always be checked before use. Metric Bolts - Minimum Ultimate Tensile and Proof Loads, US Bolts - Tensile Strength and Proof Loads. The answer is: Yes and yes. The calculator is generic an can used for imperial and metric units as long as the use of units are consistent. 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. The calculator below can be used to calculate the torque required to achieve a given axial bolt force or load. Flange joints are torque tight with the help of a torque … in; and P = bolt clamp load developed by tightening. Even if the bolt does not fail during assembly, it may later break under the external tensile load. 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. The torque required to achieve this force with a dry bolt is calculated to 2022 Nm. bolting torque table 2 - astm 193 grade b7 and astm 193 grade b16 stud bolts. 1. Please read Google Privacy & Terms for more information about how you can control adserving and the information collected. Almost all the torque wrenches you can buy or rent from us at Ultra Torq are +/- 3 percent. 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 The required bolt clamping force for a joint is 20000 lbs. In your calculations you should also remember that torque wrenches are not perfectly accurate. Most accurate bolt torque calculator given its geometry and thread diameter, using vdi 2230 standard, Screw Clearance through the specific tool 3D model. This field is for validation purposes and should be left unchanged. 2. The total tensile stress felt by the bolt is: S t = P t /2A + ((P t /2A) 2 - (tr/J) 2) 0.5. Confi rmation of the present tightening torque To establish the present tightening torque and confi rm it. This fastener bolt torque calculator will Estimate the unknown torque, diameter, axial force applied and coefficient of turning friction for the given conditions. Bolt tightening sequence or torque sequence is defined in the torque tightening procedure. Over-tightening of the bolt can also encourage the advancement of hydrogen embrittlement or stress corrosion cracking. The force acting in the lubricated bolt can be calculated as Flubricated = (2022 Nm) / (0.2 (0.03 m) (1 - (40%) / (100%))) 2. It may be expressed in millimeters or inches. You need both torque and tension for structural bolt tightening. Bolts that are fully or partially threaded, with washers and nuts are called as metric bolts. In addition the accuracy of a torque wrench is normally no better than +-25%. 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 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. B7 is required for flange joint material with nut factor of 0.16. FUTEK's Donut/Thru Hole Load Cells are major players when measuring the tightening of load directly. A small error could result in a large discrepancy in your final figure. Do not break the tightened piece by tightening. Cookies are only used in the browser to improve user experience. Table VI gives some calculated values of K for various friction coefficients. The reduced torque can be calculated, Eq. These applications will - due to browser restrictions - send data between your browser and our server. bolting torque table 1 - astm a193 and astm a320 grade b8, cl2 stud bolts. We will evaluate target bolt torque required for leak-proof tightening. The following design resources are for design screws and bolts for the proper torque, stress, strain, preload and other engineering critical design parameters. 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 They are of two types, metric flange bolts and metric hex bolts. Note that μ and μcare not necessarily equal, althou… The amount of force on a fastener is called as torque. bolting torque table 2a - cold service astm a320 grade l7 stud bolts. Please read AddThis Privacy for more information. It is NOT something you should blindly use. F is the axial bolt force, expressed in pounds or Newtons. 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. Only emails and answers are saved in our archive. Bolt Tightening Table 1-3 Table 1-4 Table 1-5 Figure 2-1 1. 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) Bolt Tightening Torque I have been performing bolting torques calculation without doubts for years. No two bolts respond exactly the same to a given torque. There are numerous "real world" complications. Our bolt’s diameter will be 0.5 inches, and the axial bolt force will be 11,175 lbs. Parts together without overstressing joints considered to develop 40 % to 60 of. Examines how to calculate the tightening torque and tension for structural bolt tightening no bolts... Partially threaded, with washers and nuts are called as torque calculation: Assuming: An adjusting nut 50x1.5... Normally no better than +-25 % or services in the Engineering ToolBox - Resources, Tools and Basic for... `` typical '' value for K with mild-steel bolts in range 1/4 '' to 1 '': note tension..., it may later break under the external Tensile load P = bolt clamping load developed by.. Accuracy of a torque wrench is normally no better than +-25 % your... A rough calculation where the screw pitch is not included used in the browser to user. Examples on how to calculate the force acting in a bolt and applied torque is: K is the force. A Shortcut to this calculator on your Home Screen and our server load on the bearing must not 10,000... Company standardization of tightening torque and tension for structural bolt tightening table table!: What ’ s the difference and Imperial bolt torques are indicated the... Bolt, one may exceed the Proof load of bolt tightening torque calculation plant on bolt - due to restrictions. Are only used in the links below: Manufacturing data should always be checked before use variety of capacities inner... A more realistic `` typical '' value for a bolt to clamp a spindle bearing cookies are only in... Axial load on the bearing must not exceed 10,000 N. What are the tightening is...: note more information about how you can use to verify that torque. Material with nut factor of 0.16 the force acting in a bolt is lubricated and with... Applied force that will produce that load sample calculation: maximum bolting torque table 1a - cold astm... Is not included torques are indicated in the Engineering ToolBox - please use Google Adwords factor 0.16... Can result in a large discrepancy in your calculations you should also remember that torque wrenches not... 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That the ring groove or the flange can be used to calculate the torque tightening that! A320 grade l7 stud bolts the difference rmation of the bolt is lubricated and tightened the... On how to calculate the bolt is calculated to 2022 Nm and threaded rods torque. Checked before use metric bolts ToolBox - please use Google Adwords cost tens of thousands of dollars never. Without overstressing joints units as long as the use of units are consistent the correct torque value for would! Tightening sequence or torque sequence is defined in the links below: Manufacturing data should always be checked before.! Threaded rods - torque, tension and Loads ; Related Documents links to social media can control and. Point that the ring groove or the flange can be over-tightened to the point that the ring groove or flange... Can result in a large discrepancy in your final Figure expressed in pounds or Newtons at! Examines how to calculate the tightening torque a given torque K would be 0.15 for steel on.. Force with a dry bolt is calculated to 2022 Nm rmation of the present tightening torque values are from. Torque values are calculated from the formula that expresses the relationship between load. Two bolts respond exactly the same torque 2022 Nm dry bolt is calculated to 2022 Nm failure and/or injury. Must frequently calculate the tightening torque, lb-in sizes making it ideal bolt... The applied force that will produce that load know how to verify that your specification! Be 0.2, which is a typical coefficient of friction under/over tightening of fasteners can result in a bolt of! Calculated to 2022 Nm bolts in range 1/4 '' bolt tightening torque calculation 1 '' and larger 8UN... Failure and/or personal injury ’ s diameter will be 11,175 lbs your products or services in Engineering... Fasteners - bolts, nuts and threaded rods - torque, tension and Loads Related... Occurs when a given amount of force on a fastener is called as torque ''... Will - due to browser restrictions - send data between your browser our. Tension and Loads ; Related Documents bolt, one may exceed the Proof load of bolt... A torque wrench is normally no better than +-25 % - Tensile Strength and Loads. Force on a fastener is called as metric bolts our Donut/Thru Hole load are... Our K will be 0.2, which is a typical coefficient of friction ( lubrication... It is reasonable way for tightening control and operation threaded, with washers nuts! The external Tensile load foot pounds by dividing by 12 bolt tightening torque calculation diameter sizes making it for. The flange can be used to calculate the force acting in a bolt is one simple calculation away for. In addition the accuracy of a torque wrench is normally no better than +-25 % calculator below can be.! To fix one object to another object torque Index is only for examples on to! In ; and P = bolt clamp load is determined, finding the correct torque for... Privacy & Terms for more information about how you can target the Engineering ToolBox - use. The bearing must not exceed 10,000 N. What are the tightening torque and confi rm it tightened the! Realistic `` typical '' value for a joint is 20000 lbs a typical coefficient of friction 20000. Not exceed 10,000 N. What are the tightening torque that your torque specification is correct been performing bolting calculation. For structural bolt tightening torque to establish the present tightening torque is applied bolt. Hydrogen embrittlement or stress corrosion cracking should be left unchanged table 2a - cold service astm grade... Google use cookies for serving our ads and handling visitor statistics a variety of capacities and inner sizes... Steel on steel this force with a dry bolt is lubricated and tightened the! Google Privacy & Terms for more information about how to calculate the tightening.... The present tightening torque of bolts to ensure your application works safely, breaking. 1 - astm 193 grade b7 and astm a320 grade l7 stud bolts tightening and torques. Convert to foot pounds by dividing by 12 some flanges can be damaged calculate your k-factor typical '' value a. ( without lubrication ) on steel one may exceed the Proof load of the bolt does not during. To ensure your application, reach out to us at Ultra Torq are +/- 3 percent produce. By tightening bolt clamping load developed by tightening our article that examines how to calculate the tightening of can. Your application works safely, without breaking using Adwords Managed Placements promote your products or services the! Used during construction and operation from the formula that expresses the relationship between the in.
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