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ASTM A325 is an ASTM International standard for heavy hex structural bolts, titled ''Standard Specification for Structural Bolts, Steel, Heat Treated, 120/105 ksi Minimum Tensile Strength''. It defines mechanical properties for bolts that range from to 1- in diameter.〔.〕 The equivalent metric standard is ASTM A325M, which is titled ''Standard Specification for Structural Bolts, Steel, Heat Treated 830 MPa Minimum Tensile Strength''. It defines mechanical properties for sizes M12–36.〔.〕 There is also a ''T'' version, which is used to refer to fully threaded bolts.〔.〕 This is a standard set by the standards organization ASTM International, a voluntary standards development organizations that sets technical standards for materials, products, systems, and services. ==Types== The ''type'' refers to the type of material used to make the bolt. The standard currently defines two types, however it previously defined the following three:〔 *Type 1: Medium carbon steel, boron steel, or medium carbon alloy steel *Type 2: Low carbon martensitic steel〔.〕 (withdrawn from the standard in 1991) *Type 3: Weathering steel Note that independent of the material the bolt is quenched and tempered.〔 抄文引用元・出典: フリー百科事典『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 A325」の詳細全文を読む スポンサード リンク
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