The working load acts on the axial direction of the bolt, and the calculation method is shown in Section 3.1.2. Bolt Torque Calculator. Pretightening Stress Calculation . Calculate the maximum torque and load for different types of bolts: BA BSF BSW Metric Coarse UNC BS970 UNF BS970 UNC ASTM UNF ASTM Mach. ASME/ANSI B16 Standards for Pipes and Fittings - The ASME B16 standards covers pipes and fittings in cast iron , cast bronze, wrought copper and steel; Bolt Torque Calculator - Calculate required bolt torque; Bronze Flanges - ASME/ANSI 300 lb - Flange diameters, thickness, bolt circles . After calculating the torque, ensure the bolts are not over-stretching and exceeding their yield strength, or some predetermined design stress. They are of two types, metric flange bolts and metric hex bolts. Du = 1.13 and reflects the ratio of the mean installed bolt pretension to the specified minimum bolt pretension, the mean value of slip coefficient to the value used for the calculations and the probability of slip. Store Service Applications Support search Search Contact Local Rep. Get in touch. Minimum three (3) inputs are required then select "Find" button to get unknown This Calculator Requires a JAVA enabled browser to function properly. How to Calculate Torque To determine an estimated torque value, use the standard torque formula: T = DFK This formula expresses the relationship between the load in a bolt and applied torque. Fortunately, torque-angle signature curves can be obtained for most bolted joints. What went unexplored until recently was how lubricant affects the Nut Factor on a fastener, which then . Screw The calculated values are the maximum recommended values, based on 90% of yield. These specs are for stock-type bolts with light engine oil applied to the threads and the underside of the bolt head. Related Topics . The amount of force on a fastener is called as torque. The amount of force on a fastener is called as torque. How to calculate bolt tightening torque. Bar KSI Calculator Tables Sy Conversion Tables to P.S.I. 12 bolt Flange. Tensioning sequence information. To calculate Tensile force on each bolt in terms of torque, you need Torque Transmitted (M t), Coefficient of Friction (μ), Diameter of shaft (d) & Number of Bolts (n). The Bolt efficiency will be low due to wide tolerance of the tension. This is the most widely used method. Use the following Torque Calculator for ASTM A193 B7 and ASTM A320 L7 bolting, as specified in API 6A, 16A and 17D for flanges. Bolts in Shear 3. By combining the torque-angle curves with a few simple calculations and a basic understanding of the Most terms are consistent with the Rec'd Min. As per indian standard, calculation use to calculate tightening torque for all classed bolt, Therefore, Bolt load, F = A*Sy*0.60 = 0.6057*105000*0.6 = 38159.1 lb Target torque calculations: Bolts that are fully or partially threaded, with washers and nuts are called as metric bolts. What is the nut factor and how does it affect torque us bolts tightening torques fastener torque specs how to determine a torque specification 2017 11 14 embly pressive stresses σ yy mpa due to bolt cling force a scientific diagram. The minimum required bolt load divided by the number of bolts in the flange will determine the minimum f, or force, needed to use the torque equation. It is reasonable way for tightening control and operation. The end goal is to produce enough clamping force to develop the required amount of gasket stress to create an effective seal. The coefficient of torque is a calculation based on the condition of the fastener and can be affected by lubrication, plating, anti-seize compounds, etc. The values used to define the maximum torques for each fastener size were taken from bolt preload tables from the Goddard Space Flight Center's (GSFC) Mechanical Fastener Torque Guidelines. Torque control method Bolt tightening is controlled by specific torque value. Rec'd Max. T= Target tighten torque K= Coefficient of friction (nut factor / Slip Factor), always an estimation in this formula D = Bolts nominal diameter P = Clamp Load or Bolt's desired tensile load (generally 75% of yield strength) Above Three factors affect how much tension occurs when a given amount of tightening torque is applied. Bolt Clamping Force vs. The stress of a bolt includes the preload and the working load. 3) Torque Tightening and Bolt PreLoad Calculation Method of torque tightening determines accuracy of bolt preload obtained. The data provided . Bolt Torque Calculator. Some flanges can be over-tightened to the point that the ring groove or the flange can be damaged. There are two preloads: one is the axial tensile stress and the other is the torsional stress around the axis. clamping force can also cause severe problems. Under quality assurance standards, rotary torque sensors are used as a torque measuring tool to verify the bolt . 3.1.1. We wish everyone a safe holiday and wonderful New Year. T = Target Input Torque (ft-lb) This is your input torque from your torque wrench determined by your specified torque. In this approach, torque (T) is equal to the multiplication of three factors: the nut factor (K), the desired bolt force (F), and the nominal bolt/stud diameter (D). The chart is provided for quick reference by fastener suppliers and users for selecting an initial target tightening torque. 4 bolt Flange. for 1/2" bolt with hex nut as the turning element Note: The following calculations are based on 1/2" dia. Lubricate all contact areas of the bolts and washers. Variation in preload (+ and -) bolt Determine Torque vs. We are often asked what torque value should be used with a specific nut/bolt assembly. This fastener bolt torque calculator will Estimate the unknown torque, diameter, axial force applied and coefficient of turning friction for the given conditions. The Official HYTORC App gives you instant access to torque charts, safety and operational videos, product manuals, service center locations and our comprehensive bolt load calculator. Therefore, the torque values in these tables are quite conservative. Lubricated on all mating surfaces of washers, studs, and nuts with Moly Paste containing 70% solids. With our tool, you need to enter the respective value for Torque Transmitted, Coefficient of Friction, Diameter of shaft & Number of Bolts and hit the calculate button. For most physics problems, this distance is measured in meters. 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. It takes more force to stretch an SAE Grade 8 bolt than it does to stretch an SAE Grade 5 bolt because Of the greater material strength. Our last day of shipment is Dec. 27, 2021. 0.13. The torque, or the moment of force, can be measured either dynamically, when the screw is tightened, or statically, by checking the torque with a torque wrench after tightening. TPI for 1" and smaller are UNC, 1-1/8" and larger are 8UN. Bolt Torque calculation for flanges 30 600# Studbolt diameter: Studbolt material: Formula used: 2 ASTM A193 B7. If you use 13. This fastener bolt torque calculator will estimate the unknown torque, diameter, axial force applied and coefficient of turning friction for the given conditions. The torque values are approved for spiral wound graphite and PTFE . Fasteners - Bolts, nuts and threaded rods - torque, tension and loads; Related Documents . An under-torqued bolt will deform and won't be able to provide as much clamping force as needed, while an over-torqued bolt will break. Here we will consider bolt torque to produce 60% of bolt yield stress. All torque and stress calculations are based on 8UN bolts, and do not take flange stress into consideration. TORQUE AND ANGLE As mentioned above, the tightening torque is for practical reasons the criteria normally used to specify the pre-stress in the screw. Formula: T= K x D x P. For other applications or questions, email [email protected]. Over-tightening of the bolt can also encourage the advancement of hydrogen embrittlement or stress corrosion cracking. Hub Height. The required tightening torque for the fastener can be estimated from the empirical expression for the . CAUTION: Care should be used when applying a formula for torque/tension relationships. The first factor is the bolt's diameter. Torque window, displays torque and defines coefficient of friction Load Graph window, displays bolt stress over a 3 stage time period BTS TAKES THE COMPLEXITY OUT OF BOLT TIGHTENING CALCULATION. Torque and Tension in Bolts: Bolt, one of the most widely used fasteners in the industry, is usually tightened by applying torque to the head and/or nut. now the engineer claimed that by specifying a 1000 ft-lb tightening torque will be adequate based his calculation. TPI for 1" and smaller are UNC, 1-1/8" and larger are 8UN. The table below lists a typical range for the "K Factor" as well as the values used in calculating the RepairEngineering Bolt Torque Chart. Bolted Joint Torque Explanation and Calculation . The third CALC T (ft-lbf) ft-lbf Tftlbf 204.01 =+Tinchlbf/12. Bolt Tightening Torque Calculation - Free download as Excel Spreadsheet (.xls / .xlsx), PDF File (.pdf), Text File (.txt) or view presentation slides online. New Xylan coated steel bolts and nuts with 1/4 in. Bolt Torque Calculator Free Download For Desktop Windows 7 Torque calculations are based on the simplified formula explained in the current version of ASME PCC-1, Appendix K. As gasket load requirements for standard flanges generally fall within the mid-range of the bolt loads, gasket stress has not been used to calculate torque values. The coefficient of torque is a calculation based on the condition of the fastener and can be affected by lubrication, plating, anti-seize compounds, etc. Bolt Torque Calculator Excel. Moly and other lubes offer reduced friction and increased bolt tension, which will affect the torque figure. Metric bolt grades and strength calculator to show proof strength, tensile strength, Vickers / Brinell hardness, minimum breaking torque and stress area of metric bolts and screws made of carbon steel and alloy steel with designations 4.6, 4.8, 5.8, 8.8, 9.8, 10.9 and 12.9. Torque is only an indirect indication of tension. It is not unusual to increase bolt size because the torque tightening method cannot guarentee a minimum preload. Bolt torque is calculated for a flanged assembly using the following equation. In addition, the powerful tool, "Goal Seek" can be used to optimize each Calculation. All calculations are for Coarse Thread Series (UNC). Lubed means cleaned, dry bolts, lubricated with standard medium viscosity machine oil. The required torques for fastening common steel fasteners can be found in the Bolt Torque Calculator. Some flanges can be over-tightened to the point that the ring groove or the flange can be damaged. Tension Relationship major_diameter bolt 1 i in psi lb in in ksi psi 1000 minor_diameter bolt 2 i in dm is the effective contact diameter for the threads and is the average of major and minor diameters; It Bolt Torque Calculator Calculate required bolt 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) where T = wrench torque (Nm, lbf ft) K = constant that depends on the bolt material and size d = nominal bolt diameter (m, ft) P = 85,000 x .3382 P= 28,747 lb. Description. For example Torque calculation of high-strength bolts N/m² = Pa N/mm² = MPa Our offices will be closed from Dec. 24 - Jan. 3, 2022. Bolt Stress window, displays bolt stress, bolt load and % of bolt yield. torque is applied. D is the bolt diameter. torque necessary to achieve a % of bolt yield. Enerteq Solutions, Inc. assumes no responsibility for the use of these calculations. K = nut factor This is your X if you are doing testing, D = nominal diameter (bolt diameter) of the fastener (in.) As an example, we can utilize the equation to find the correct torque value for a zinc-plated, heavy structural bolt, in this instance belonging to ASTM A325 with a ¾ inch diameter and 10 TPI. Note 2 - Thread Tensile area formula from EPRI Good Bolting Practices, Volume 2. For the case where the joint "diameter" is greater than the diameter of the bolt head (or washer) but less than three times the diameter, the area that should be used is A = π 4 [ d h 2 − ( q d b) 2] + π 8 ( D J d h − 1) ( d h l 5 + l 2 100) when d h < D J ≤ 3 d h (14) The first term accounts for all the area under the bolt (or washer). the breakout torque seen at the bolt head or at the nut of the fastener. T = Torque acted on the fastener D_n = Nominal Diameter of the fastener F_AP = Axial Preload Force applied to the bolted joint K_T = Coefficient of Torque. Rotation angle method This chart was derived by using the formula shown earlier. Weld Leg at Pad OD. The first factor is the bolt's diameter. Torque Calculator- this app is intended for plant and field estimation of a torque value based on bolt size or nut size and lubrication. Bolt Tightening Sequence to Follow. 13.3 Anchor.-Calculate the tension in the rock bolt or its anchor, P, as follows: P = R x C x T where: R =ratio of correct torque . K Factor. Clamp loads are based on 75% of the minimum proof loads for each grade and size. By applying tightening torque, we are basically stretching the bolt. Title: Metric Bolts, Screws & Nuts: Tightening Torques Author: Fastener Mart Created Date: 8/12/2006 10:22:23 PM As = π/4 x (3/4in. For easy handling, bolt numbering shall be done clockwise around the flange with the following sequence. As the bolt is tightened, it is stretched (preloaded). 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