ASTM A490 and ASTM A490M are ASTM International standards for heavy hex structural bolts made from alloy steel. The imperial standard is officially titled Standard Specification for Structural Bolts, Alloy Steel, Heat Treated, 150 ksi Minimum Tensile Strength, while the metric standard (M) is titled Standard Specification for High-Strength Steel Bolts, Classes 10.9 and 10.9.3, for Structural Steel Joints.[1][2]
In 2016, specifications A325 and A490 were officially withdrawn by ASTM and replaced by ASTM F3125. A325 and A490 heavy hex structural bolts are now grades under the new F3125 specification.[3]
N: A bearing type connection where the threads are on the shear plane.
X: A bearing type connection where the threads are not on the shear plane.
Mechanical propertiesedit
These bolts are equivalent to ASTM A325 bolts in application and geometry, but are made to a higher strength. The imperial grades are made to the same strength specifications as ASTM A354 grade BD. The metric grades are made to the same strength specifications as ASTM F568M property class 10.9.[5] Also, unlike their weaker counterparts they may not be coated by hot-dip galvanization, mechanical deposition, or electroplating.[4]
Because these bolts are designed to be used in structural applications the threaded length of the bolts are shorter to keep the threads out of the joint.[4]
Imperial head markings and mechanical properties[6]
astm, a490, astm, international, standards, heavy, structural, bolts, made, from, alloy, steel, imperial, standard, officially, titled, standard, specification, structural, bolts, alloy, steel, heat, treated, minimum, tensile, strength, while, metric, standard. ASTM A490 and ASTM A490M are ASTM International standards for heavy hex structural bolts made from alloy steel The imperial standard is officially titled Standard Specification for Structural Bolts Alloy Steel Heat Treated 150 ksi Minimum Tensile Strength while the metric standard M is titled Standard Specification for High Strength Steel Bolts Classes 10 9 and 10 9 3 for Structural Steel Joints 1 2 In 2016 specifications A325 and A490 were officially withdrawn by ASTM and replaced by ASTM F3125 A325 and A490 heavy hex structural bolts are now grades under the new F3125 specification 3 Connection types editThere are also three connection types defined 4 SC A slip critical connection N A bearing type connection where the threads are on the shear plane X A bearing type connection where the threads are not on the shear plane Mechanical properties editThese bolts are equivalent to ASTM A325 bolts in application and geometry but are made to a higher strength The imperial grades are made to the same strength specifications as ASTM A354 grade BD The metric grades are made to the same strength specifications as ASTM F568M property class 10 9 5 Also unlike their weaker counterparts they may not be coated by hot dip galvanization mechanical deposition or electroplating 4 Because these bolts are designed to be used in structural applications the threaded length of the bolts are shorter to keep the threads out of the joint 4 Imperial head markings and mechanical properties 6 Grade identification marking Specification Nominal size range in Proof strength ksi Yield strength min ksi Tensile strength min ksi Core hardness Rockwell nbsp ASTM A490 Type 1 1 2 1 1 2 120 130 7 150 minimum173 maximum 1 C33 38 nbsp ASTM A490 Type 2 withdrawn 1 2 1 nbsp 8 ASTM A490 Type 3 1 2 1 1 2Head markings and strengths for metric hex head cap screws 2 5 9 Grade identification marking Specification Nominal size range mm Proof strength MPa Yield strength min MPa Tensile strength min MPa Core hardness Rockwell nbsp ASTM A490M Type 1 12 36 830 940 1040 C33 39 nbsp ASTM A490M Type 2 withdrawn 10 nbsp ASTM A490M Type 3References edit a b ASTM A490 08b retrieved 2009 06 23 a b ASTM A490M 09 retrieved 2009 06 23 Home portlandbolt com a b c ASTM A490 Portland Bolt amp Manufacturing Co retrieved 2018 06 20 a b Metric structural fasteners archived from the original on 1999 04 21 retrieved 2009 06 06 Grade Markings Carbon Steel Bolts retrieved 2009 05 30 ASTM SAE and ISO grade markings and mechanical properties for steel fasteners retrieved 2009 06 06 Other markings may be used to denote atmospheric corrosion resistant material Metric Handbook archived from the original on October 31 2007 retrieved 2009 06 06 Fastener identification marking PDF retrieved 2009 06 23 Retrieved from https en wikipedia org w index php title ASTM A490 amp oldid 1103026198, wikipedia, wiki, book, books, library,
