AS1252 High Strength Steel Hex Nuts

AS 1252 High Strength Steel Hex Nuts are designed for structural bolting systems where the nut forms part of a controlled high-strength connection. Rather than serving simply as a threaded counterpart to a bolt, the nut is selected as part of a matched fastening assembly in which the thread, bearing surface, material properties, and tightening requirements all contribute to the performance of the joint. The hexagonal configuration provides six accessible faces for tightening with a suitable wrench or socket.

The AS 1252 specification provides a standardized basis for structural hex nuts used with compatible high-strength bolts and washers. Their robust geometry and controlled mechanical properties make them suitable for connections where consistent clamping force and reliable load transfer are important. The nut is normally specified together with the corresponding structural bolt system rather than treated as an interchangeable general-purpose hex nut.

Specification:

AS 1252 High Strength Steel Hex Nuts are specified for use within structural bolting systems covered by the Australian Standard. The specification covers the nut’s dimensional configuration and mechanical requirements, allowing it to be selected as a compatible component of a high-strength structural fastening assembly. The hexagonal body provides the wrenching surfaces required for controlled installation, while the internal thread is matched to the corresponding structural bolt.

For structural bolting, compatibility extends beyond nominal thread diameter. The nut should correspond to the specified structural bolt system in terms of thread, dimensions, mechanical requirements, and surface condition. This is particularly important for high-strength assemblies where the nut, bolt, and washer work together during tightening. Using a general-purpose nut simply because it has the same thread size does not necessarily provide an equivalent structural connection.

Hardness:

Chemical Composition:

Dimension Chart of AS1252 Hex Nut:

The AS 1252 Hex Nut dimension chart provides the key measurements required to select the correct nut for a high-strength structural bolting assembly. Because the nut works together with a compatible structural bolt and washer, the nominal thread size is the starting point for selection, while the nut’s external dimensions determine how it fits the assembled joint and the wrench or socket used for tightening.

The principal dimensions include the nominal thread diameter, width across flats, nut thickness, and width across corners. The width across flats determines the required wrench or socket size, while the nut thickness establishes the available threaded engagement with the mating bolt. The width across corners can also be useful when checking clearance around the nut in confined structural connections.