2005 3 17 nbsp 0183 32 There are no Section VIII or B31 3 limits for the stress in the bolt resulting from flange bolt up torque but clearly you do not want to start necking the bolt or overloading the flange A generally recommended bolt pre stress for low alloy high strength bolting in B16 5 type flanges is 50 ksi

See Torque Force Design Equations webpage and torque chart page for recommended fastener torque and equation data This fastener bolt torque calculator will Estimate the unknown torque diameter axial force applied and coefficient of turning friction for the given conditions

Edit Bolt torgue is a function of two parameters 1 Friction Coefficient between the flange and the bolt 2 Nominal Diameter of the Bolt Torque Friction coefficient Nominal diameter of the bolt Pretension Force Normally for steel flanges and bolts the friction co efficeint is 0 12 to 0 14 Post Reply

Torque Applied T k d f 1000 where T Torque in N m f Bolt load in N d Bolt diameter in mm k Dimensionless nut factor or tightening factor Nut Factor on Flange Bolt Torque calculation The nut factor or tightening factor k is a modified friction factor

For a stress regime associated with a bolt i e pure tensile stress s x combined with shear stress τ xy The Factor of safety relative to the material tensile strength S y is calculated as follows Factor of Safety S y s x 2 3 τ xy 2 1 2 Preloaded Bolts

TIGHTENING TORQUE FOR CLASS 8 8 BOLTS METRIC COARSE BOLT DIAMETER X PITCH THREAD STRESS AREA mm2 TIGHTENING TORQUE Nm PRE LOAD Kn TIGHTENING TORQUE Nm PRE LOAD Kn M5 x 0 8 14 2 7 4 5 2 7 6 5 M6 x 1 20 1 10 4 9

2020 10 4 nbsp 0183 32 Standard recommended torque spec for each size bolt Conversion factor based on bolt condition reduce by 30 for heavily greased anti seized bolts Coefficient factor indicates bolt condition k factor indicates dry vs lubed vs greased etc koken chart is

Bolt torque provides only an indirect approximation of material stress It is estimated that only about 10 of the tightening torque actually results in useful bolt tensioning The remaining 90 is lost due various forms of friction that occur during the tightening process

Table V Bolt Torque No lubrication on threads Torque values are based on friction coefficients of 0 12 between threads and 0 14 between nut and washer or head and washer as manufactured no special cleaning Size Root area in 2 Torque range class 8 150

2021 1 27 nbsp 0183 32 This is your input torque from your torque wrench determined by your specified torque K nut factor This is your X if you are doing testing D nominal diameter bolt diameter of the fastener in F target preload lb NOTE do not confuse this with bolt yield point or yield strength that you are targeting it is in pounds of force

It is an experimentally derived constant that includes the impact of friction Notes Bolting torque to develop 50 Bolt Yield Stress at Nut Factor K 0 16 This Table is applicable to Never Seize paste and Fel Pro lubricant K 0 16 The above Table is applicable only for ASTM A320 Grade L7 A193 Grade B7 and A193 Grade B16 Stud Bolts

2019 8 18 nbsp 0183 32 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 2238 Nm Lubricating the bolt with SAE 30 oil reduces the torque required to achieve the same tension with approximately 40 The reduced torque can be calculated

K Factor is a torque coefficient between bolt and receptacle It is a function of the materials frictional characteristics which are based on surface finish coatings and so on Various K Factors Typical Steel Bolt 0 20 Zinc Plated 0 20

Repeat until bolts have been successively tightened Pass 4 Set the torque wrench to 100 torque value and repeat crisscross pattern for a 4th time Pass 5 Check all bolts at 100 torque with a circular pattern Bolt Tightening Sequence Crisscross pattern

2015 5 13 nbsp 0183 32 Bolt torque force and stress table 1 Garlock Sealing Technologies 1666 Division Street Palmyra NY 14522 800 448 6688 Table 1 Stress Bolt Size Root Area quot k quot 30 000 psi 45 000 psi 60 000 psi inches sq in Factor Torque ft lbs Force lbs bolt Torque ft lbs Force lbs bolt Torque ft lbs Force lbs bolt 0 250 0 027 0 237 4 810 6 1215 8 1620

Bolt Torque Calculator The calculator below can be used to calculate the torque required to achieve a given axial bolt force or load The calculator is generic an can used for imperial and metric units as long as the use of units are consistent K constant d diameter of bolt m ft

The Bolt Torque amp Preload calculator can be used to calculate the torque required to achieve the desired preload on a bolted joint See the reference section for details on the methodology and the equations used Preload Uncertainty amp Relaxation Due to preload uncertainty the actual preload applied to the bolt may be more or less than the nominal value

Bolted Joint Analysis The bolted joint is among the most common joining methods other common joining methods include riveting welding press fits pins keys and adhesives The primary components of a bolted joint include the threaded fastener as well as the parts to be joined together the clamped parts

Bolting torque to develop 50 Bolt Yield Stress at Nut Factor K 0 16 This Table is applicable to Never Seize paste and Fel Pro lubricant K 0 16 The above Table is applicable only for ASTM A320 Grade B8 Class 2 and A193 Grade B8 Class 2 Stud Bolts These are 304 SS material The torque values are approved for spiral wound graphite and PTFE

Torsion is the twisting of the bolt when applying the tightening torque When a bolt is tightened it is subjected to tensile stress as preload is introduced but also to torsion stress as a result of thread friction Torsion generates shearing stress that is perpendicular to the radius in the circular cross section of the bolt

All torque values are based on the use of through hardened flat washers under the bolt head and nut or just under the bolt head for tapped hole assemblies 5 Tolerances on

Click here to calculate torque to achieve psi tension in the bolt Two coefficients of friction or f factors are recognized by API A coefficient of friction of 0 13 approximates the friction with threads and nut bearing surfaces being bare metal or plated and well lubricated with thread compound tested in accordance with API RP 5A3 ISO 13678

Conversion of tension to torque must be done with the following factors in mind Accurate conversion of bolt tension readings to foot pounds of torque must account for the dynamics of the friction between the threads and under the turned element Tension developed in a bolt by the application of torque can vary greatly as the rate of rotation

Bolt Torque for Bus Connections Silicon Bronze Fastners 1 Torque Foot Pounds Aluminum Alloy Fastners 2 Torque Foot Pounds Bolt Diameter in inches 5 16 3 8 1 2 5 8 3 4 Lubricated 8 0 11 2 20 0 32 0 48 0 1 Bronze alloy bolts shall have a pounds per

Bolt elongation is directly proportional to axial stress when the applied stress is within the elastic range of the material If both ends of a bolt are accessible a micrometer measurement of bolt length made before and after the application of tension will

bricated bolt It has been further found that different lubricants produce results varying between the limit of 50 and 100 of the tabulated stress ﬁgures These tables are for reference only See torque tables for recommended installation torques Bolt Stress to

Metric Bolt Torque Table MARYLAND METRICS Technical Data Chart Standard tightening Calculating Yield amp Tensile Strength Portland Bolt A 1 Miller s Performance Enterprises Parts amp Services A short guide to metric nuts and bolts Thomson Rail

Table 1 Friction in threads of different material Bolt material Nut material Dry Lightly oiled Untreated Untreated 0 18 0 35 0 14 0 26 reasons the criteria normally used to specify the pre stress in the screw The torque or the moment of force can be

Torque to Angle Indicator Part Number TRQ 1 With T T Y head bolts the Torque To Angle Indicator Part Number TRQ 1 should be used in conjunction with a torque wrench to achieve proper bolt loading While the head bolts are being torqued to the specified

Note The term strength in this context differs from stress by being defined for a specific bolt sstress area and presented in units of force Worth mentioning is that strength is also commonly used interchangeably with stress and presented in units of pounds per square inch psi for USCS or Megapascals MPa for SI

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