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Stainless steel hollow bars

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Stainless steel hollow bar – what is it used for?

Hollow bar is heavy-wall seamless tube – in effect, a bar with a ready-made bore. It replaces solid bar wherever the finished part has to be hollow anyway, saving drilling and boring time, material and tooling.

Typical applications

  • bearing, guide and spacer bushings,
  • rings, flanges and sealing components,
  • valve bodies, fittings and hydraulic parts,
  • hollow shafts and machine parts for the food, chemical and marine industries.

Standards and choosing a size

Hollow bar for machining is covered by EN 10294-2, and seamless stainless steel tube by EN 10216-5. When choosing a size, allow for machining stock: the outside diameter of the hollow bar should be slightly larger, and the inside diameter slightly smaller, than those of the finished part.

Why hollow bar instead of solid bar?

When machining solid bar, most of the material ends up as chips. Hollow bar with the right inside diameter shortens machining time, reduces tool wear and lowers the cost per part – especially for large diameters and more expensive acid-resistant grades.