Alloy Steel Hydraulic Cylinder Tube
Seamless tube made of alloy steel, such as 4140 grade, with wall thickness under 4 mm, used in manufacturing hydraulic and pneumatic cylinders. It falls under HTS 7304.90.70.00 as a seamless hollow profile of alloy steel with thin walls. These tubes are precision-honed inside for piston rod sealing.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If made of carbon steel rather than alloy steel
Carbon steel seamless tubes with <4 mm walls classify under 7304.31, differentiated by chemical composition thresholds for alloying elements.
If welded instead of seamless
Welded alloy steel pipes, even with similar dimensions, fall under Chapter 73 heading 7306 for welded tubes.
If wall thickness 4 mm or greater
Thicker-walled seamless alloy steel tubes shift to 7304.90.30, based on explicit wall thickness criterion in subheading.
Not sure which classification is right?
Our AI classifier can analyze your specific product and recommend the correct HTS code with confidence.
Import Tips & Compliance
• Verify alloy steel composition via mill test certificate (MTC) to confirm classification under 7304, avoiding reclassification to carbon steel headings
• Ensure wall thickness documentation <4 mm; ultrasound gauging reports prevent disputes at customs
Related Products under HTS 7304.90.70.00
17-4PH Seamless Alloy Precision Tube
17-4PH stainless alloy seamless precision tube, 0.9 mm wall for medical device shafts. Ultra-thin wall alloy steel seamless under HTS 7304.90.70.00. Mirror polish interior finish.
4140 Seamless Alloy Steel Tubing
Hot-finished seamless tubing of 4140 chrome-moly alloy steel, wall thickness 2-3 mm, supplied in rounds for mechanical applications. Classified in 7304.90.70.00 due to alloy steel composition and thin walls. Ideal for shafts, axles, and structural components requiring strength.
Chromoly 4130 Seamless Round Tube
4130 chromoly seamless tube with 0.083 inch (2.1 mm) wall thickness, in 1-inch diameter, for automotive roll cages and chassis. HTS 7304.90.70.00 applies to its alloy steel seamless thin-wall profile. Heat-treatable for high tensile strength.
Alloy Steel Instrument Tubing
Precision seamless alloy steel tubing (e.g., 316L stainless alloy equivalent), wall <1 mm, for pressure/temperature instruments. Under 7304.90.70.00 for thin-wall seamless alloy profiles. Used in gauges, sensors, and control systems.
42CrMo4 Seamless Alloy Tube
EN 42CrMo4 grade seamless alloy steel tube, 3 mm wall, for European machinery OEMs. Seamless hollow profile of alloy steel <4 mm wall qualifies for 7304.90.70.00. Quench and temper for wear resistance.
15-5PH Stainless Alloy Seamless Tube
15-5PH precipitation hardening stainless alloy seamless tube, 2.8 mm wall, for aerospace actuators. Alloy steel hollow profile with thin walls under HTS 7304.90.70.00. High strength-to-weight ratio.