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topic 7658

Bore Improvement in Long Hypodermic Needle Tubing


Information requested on a method to improve the Bore in Hypodermic Needle Tubing 316 Stainless Steel of 1 meter length. ID 2.5mm (0.1"). WT 0.4mm.(0.016"). The bore is quite good on commercial hypo tube, however there are small rings and diameter variancies produced in the drawing process. These need to be reduced to give a consistent round bore over the full tube length. The ID surface is also not very polished, compared to the outside. This needs improving to say 0.1 Ra. The actual finished diameter is not critical, it is the ID consistency and ID polish that is important. Straightness of the tube is not important Batches of 500x1 meters to be finished. Must be 1 meter minimum length. Other tubes in diameter range of 2 to 5mm ID also to be finished.

Peter Holdswoth
- Gisborne, NewZealand


You can use a electropolishing method, to clean ID of 304 stainless steel tubings. As we manufacture reusable hypodermic needles, we are following this method to clear ID of 304 s.s. tubes, and it gives satisfactory results. Moreover, ultrasonic cleaning method is also very much useful (media should be T.C.)

Mr. Jhaveri

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