Transcription of Suggested Tightening Torque1 Values To Produce ...
1 CATALOG 13D01002003004005006007008009001000 Tightening torque (inch-lbs.) Tightening TorqueTightening TorqueTightening TorqueTightening TorqueBolt Clamping Force (lbs.)Technical DataSuggested Tightening Torque1 Values To Produce Corresponding Bolt Clamping LoadsNotes:1. Tightening torque Values are calculated from the formula T = KDP, where T = Tightening torque , lb-in.; K = torque -frictioncoefficient; D = nominal bolt diameter, in.; and P = bolt clampingload developed by Tightening . Clamp load is also known as preload or initial load in tension onbolt. Clamp load (lb.) is calculated by arbitrarily assuming usablebolt strength is 75% of bolt proof load (psi) times tensile stress area(sq. in.) of threaded section of each bolt size. Higher or lower valuesof clamp load can be used depending on the application require-ments and the judgement of the Tensile strength (min psi) of all Grade 7 bolts is 133,000. Proofload is 105,000 Tensile strength (min psi) of all Grade 8 bolts is 150,000 load is 120,000 : Fastening Reference.
2 Machine Design. Nov. Clamping TorqueforUnlubricated Steel " -183/8"-161/2"- 135/8"-113/4"-1010,0009,0008,0007,0006,0 005,0004,0003,0002,0001,0000 SAE Grade 2 BoltsSAE Grade 5 BoltsSAE Grade 73 SAE Grade (in.)A (sq. in.) (min psi)(psi)P (lb.)K= (min psi)(psi)P (lb.)K= (lb.)K= (lb.)K= in. lb. in. lb. in. lb. in. lb. ,00055,00024054120,00085, ,00033,000114001651252940043032036400520 400416006004607 ,00074,000423008006006010011208406870012 809601-1 23801780118400272020401-1 27802080126500316023601-1 3100232014220035602660D48
