Transcription of Torque-Tension Relationship for ASTM A574 Socket Head Cap ...
1 Caution: All material included in this chart is advisory only, and its use by anyone is voluntary. In developing this information, Fastenal has made a determined effort to present its contents accurately. Extreme caution should be used when using a formula for torque/tension relationships. Torque is only an indirect indication of tension. Under/over tightening of fasteners can result in costly equipment failure or personal injury. Rev 3-4-09 Torque-Tension Relationship for ASTM A574 Socket Head Cap Screws (in.)(sq. in.)(lbs)(ft-lbs)(ft-lbs)(ft-lbs)(sq. in.)(lbs)(ft-lbs)(ft-lbs)(ft-lbs)1 1 1 3 1 3 = = = = per inchTensile Stress AreaClamp LoadUnified Coarse Thread SeriesFine Thread SeriesNominal Diathreads per inchTensile Stress AreaClamp LoadTightening TorqueTightening TorqueK = = Clamp load calculated as 75% of the proof load for Socket head cap screws as specified in ASTM A574.
2 Torque values calculated from formula T=KDF, where K = for "lubricated" conditions, K = "as-received" and K = for "dry" conditions D = Nominal Diameter F = Clamp Load
