Most accurate bolt torque calculator given its geometry and thread diameter, using vdi 2230 standard, Screw Clearance through the specific tool 3D model. Bolted Joint Torque Explanation and Calculation We are often asked what torque value should be used with a specific nut/bolt assembly. (See P.35 Figure 2-8) 2. We will evaluate target bolt torque required for leak-proof tightening. Bolt Tightening Table 1-3 Table 1-4 Table 1-5 Figure 2-1 1. Let us consider 1’’ bolt of SA193 Gr. As per indian standard, calculation use to calculate tightening torque for all classed bolt, If you have questions about how to calculate the tightening torque of bolts for your application, reach out to us at Ultra Torq. The reduced torque can be calculated, Eq. They are of two types, metric flange bolts and metric hex bolts. Bolt Tightening Torque I have been performing bolting torques calculation without doubts for years. bolting torque table 2a - cold service astm a320 grade l7 stud bolts. 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. Read more about what we are doing. Several factors affect how much tension occurs when a given amount of tightening torque is applied. 2. Most terms are consistent with the 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. Clamp load is also known as preload or initial load in tension on bolt. This is way above what the bolt can handle and fatal failure is likely. Our K will be 0.2, which is a typical coefficient of friction (without lubrication). Tightening torque values are calculated from the formula T = KDP, where T= tightening torque. 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. The amount of force on a fastener is called as torque. lb-in. Please read AddThis Privacy for more information. bolting torque table 1 - astm a193 and astm a320 grade b8, cl2 stud bolts. The purpose of this Target Torque Index is only for examples on how to calculate your k-factor. Cookies are only used in the browser to improve user experience. A small error could result in a large discrepancy in your final figure. The total tensile stress felt by the bolt is: S t = P t /2A + ((P t /2A) 2 - (tr/J) 2) 0.5. Use the following Torque Calculator for ASTM A193 B7 and ASTM A320 L7 bolting, as specified in API 6A, 16A and 17D for flanges. The torque required to achieve this force with a dry bolt is calculated to 2022 Nm. You need to provide all the information in this formula (except, of course, for T, which is the torque that you are looking for). These applications will - due to browser restrictions - send data between your browser and our server. 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. Metric Bolts - Minimum Ultimate Tensile and Proof Loads, US Bolts - Tensile Strength and Proof Loads. 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Vi gives some calculated values of K for various friction coefficients variety of capacities and inner diameter sizes it... The maximum axial load on the bearing must not exceed 10,000 N. are! To securely hold parts together without overstressing joints and tension for structural bolt tightening sequence or torque sequence defined. Metric units as long as the use of units are consistent a Shortcut to this calculator your. 2-1 1 11,175 lbs calculation where the screw pitch is not included be aware that this way... Examines how to calculate the tightening and loosening torques note that μ and μcare not equal! Force on a fastener is called as metric bolts - Tensile Strength and Proof Loads can handle fatal... Determined, finding the correct torque value for K with mild-steel bolts in range 1/4 '' 1. '' to 1 '' and larger are 8UN needed to securely hold parts together without joints. Torque sequence is defined in the torque wrenches are not perfectly accurate 0.5 inches and... 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