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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''.〔.〕〔.〕 ==Connection types== There are also three connection types defined:〔.〕 *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. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「ASTM A490」の詳細全文を読む スポンサード リンク
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