ASTM A490

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.

Types

The type refers to the type of material used. The standard currently defines two types, however it previously defined the following three:

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.

Mechanical properties

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. |- ! Head marking !! Grade !! Nominal size range [in] !! Proof strength [ksi] !! Yield strength (min) [ksi] !! Tensile strength (min) [ksi] !! Core hardness [Rockwell] |- | || Type 1 || –1- || rowspan=3 | 120 || rowspan=3 | 130 || rowspan=3 | 150 minimum173 maximum || Type 3 || –1- |}

References

Category:ASTM standards Category:Screws