659 - Certain strata steel bolts from China

The goods the subject of the application (the goods) are:

Certain strata reinforcing steel bolts, hollow, made from flat rolled steel, whether or not metallic coated (e.g. galvanised), whether or not containing alloys, with an outside diameter from 44 millimetres up to and including 48 millimetres, of a length from 2.2 metres up to and including 2.5 metres, of a base metal thickness from 2.8 millimetres up to and including 3.4 millimetres, whether or not including the welded ring. 

 

Further information 

A strata bolt of a kind the subject of this application, referred to as a friction bolt, is manufactured from hot-rolled coil steel (HRC). All forms of HRC feed material are considered relevant to the goods, regardless of the particular grade or alloy content. 

HRC is roll-formed into a hollow C-shape section with the diameter measured at the non-tapered end. A steel ring is welded at one end of the bolt, with the other end tapered.

For metallic coated friction bolts, the minimum/maximum coating thickness requirements are applied. 

A friction bolt, also known as a split set, or a friction ‘lok’, is a type of ground support used primarily in mining, tunnelling, and civil engineering projects. Its primary function is to stabilise rock formations and prevent rock falls in underground excavations. 

Friction rock bolts are inserted into drilled holes in the rock. As the bolt is driven into the hole, it expands slightly due to its split design, creating friction along the length of the bolt. This friction holds the rock in place and helps prevent movement.

The subject goods are typically/nominally 2.4 metres in length, 47mm in diameter at the non-tapered end, and with a base metal thickness (BMT) of 3.2mm. Product characteristics however fall across the full spectrum of the definition set forth above. 

Where the nominal and actual measurements vary, a product is within the scope if application of either the nominal or actual measurement would place it within the scope based on the definition set forth above. 

The applicants consider that the Australian manufactured like goods are fully substitutable with all types of imported Chinese friction bolts.

Goods excluded from the measures are:

Excluded from this application are strata reinforcing bolts that contain a solid centre reinforcing bar and locking system. These goods, commonly referred to as a mechanical point anchored bolt or mechanical lock, are used in underground strata support applications and include a tensionable point anchor by way of an internal solid steel bolt.