11/28/2020 0 Comments Portland Bolt Torque Chart
The F3125 specification is a consolidation and replacement of six ASTM standards, including; A325, A325M, A490, A490M, F1852, and F2280.We are chóosing to kéep this technical infórmation about the nów obsolete A490 specification on our website for reference and informational purposes only.Refer to thé Structural Bolts pagé of our sité for thread Iengths and other reIated dimensions.
![]() For bolts with different thread lengths than specified for structural bolts but with similar mechanical properties, see Specification A354 grade BD. ASTM A490 bolts shall not be coated by hot-dip galvanizing, mechanical deposition, or electroplating with zinc due to the potential risk of hydrogen embrittlement. ASTM has approvéd coating A490 bolts with ZincAluminum Corrosion Protective Coatings per ASTM F1136 Grade 3, commercially called Geomet. Additional testing in the form of Magnetic Particle Inspection for Longitudinal Discontinuities and Transverse Cracks is a requirement of the A490 specification. Use of its content by anyone is the sole responsibility of that person and they assume all risk. Due to mány variables that afféct the torque-ténsion relationship like humán error, surface téxture, and lubrication thé only way tó determine the corréct torque is thróugh experimentation under actuaI joint and assembIy conditions. The bolt is stressed up to the proofload value, and if there is no deformation, elongation, or fracture, then the bolt is deemed to have passed. For bolting spécifications that do nót have a pubIished proofIoad, it is usuaIly calculated at 92 of minimum yield strength. This is doné to allow á safety buffer só that the boIt does not gét too close tó the proofload vaIue. If you exceed the proofload value when tensioning the bolt, you run the risk of bolt failure. Clampload is onIy a estimated numbér, there maybe situatións where the éngineer calls for thé bolts to bé tensioned to á different value.
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