8412.21.00.15 - Tie-rod type

This HTS category, 8412.21.00.15, specifically covers hydraulic cylinders of the "tie-rod type." These are linear actuators that utilize hydraulic fluid pressure to generate force and motion in a straight line. Tie-rod cylinders are characterized by their construction, where threaded tie rods connect the end caps to the cylinder body, providing structural integrity and tensile strength. They are commonly employed in applications requiring controlled linear movement, such as in heavy machinery, construction equipment, industrial automation, and agricultural implements.

The distinction between this category and its sibling, 8412.21.00.30 (Weld fused type), lies in their manufacturing and construction. While both are hydraulic cylinders, the "tie-rod type" relies on external tie rods for assembly and structural support. In contrast, "weld fused type" cylinders are typically fabricated by welding the end caps directly to the cylinder barrel. This difference in construction impacts their pressure ratings, repairability, and suitability for specific operating environments. The "Other" sibling category would encompass any linear acting hydraulic cylinders that do not fit the specific descriptions of tie-rod or weld fused types.

As this is a leaf node, there are no further subcategories within 8412.21.00.15. Therefore, the classification is definitive for tie-rod type hydraulic cylinders that do not fall under more specific subdivisions or exceptions. Classification decisions at this level should focus on confirming the tie-rod construction as the primary identifying characteristic.