ASTM A325发表评论(0)编辑词条

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 1⁄2 to 1-1⁄2 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.

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Type 2: Low carbon martensitic steel(withdrawn from the standard in 1991)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 quench and tempered.

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.