Cold-Rolled 17-4 PH Stainless Steel Capillary Tubing
Precision cold-rolled seamless capillary tubes of 17-4 PH precipitation-hardening alloy steel, circular cross-section under 3mm OD, for instrumentation and chromatography. Falls under 7304.51.50.60 as other cold-drawn/rolled seamless alloy steel tubes. Alloy steel per chapter notes, hollow profile suitable for wire-like dimensions.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If hot-rolled or not cold-formed
Hot-formed alloy steel bars/tubes shift to Chapter 72 hollow bar headings.
If parts of liquid pumps or compressors
If imported specifically as pump shafts or housings, end-use classification under machinery parts applies.
If of other alloy steel not cold-drawn
Hot-finished or annealed alloy tubes fall under the 'other' cold-formed exclusion.
Not sure which classification is right?
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Import Tips & Compliance
• Provide chemical analysis confirming 17-4 PH alloy (UNS S17400) to distinguish from standard stainless; pitfall is generic 'stainless' declaration triggering audits
• Measure and declare precise tolerances; capillary tubing often scrutinized for 'tube' vs 'wire' classification
• For cleanroom use, include surface finish specs (e.g
• electropolished) in documentation
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