Hollow Bar in PEEK 1000 mm beige

A hollow bar in PEEK is a heavy walled tubular format meant for machining away material. You get a blank with both an outer and an inner diameter, so that large sleeves, flanged bushings and tubular machine parts can be turned directly without a solid round rod having to be bored out first. That saves both machining time and PEEK material, which shows in the final cost.

PEEK holds 260 degrees continuously and takes short peaks up to 300 degrees. The flammability rating is V0 per UL 94. For a semi-finished product meant to be machined into machine parts in process, automotive and medical technology, that is a useful combination. Water absorption is low, around 0.03 percent, so the machined parts hold their dimensions even in a damp and warm environment.

Mechanically the tensile strength per ISO 527 sits around 116 MPa, the ball indentation hardness around 253. Those are values that let a turned PEEK part replace bronze and stainless components where weight, corrosion or electrical insulation decides. The friction picture against steel is favorable, and the wear resistance good even at elevated temperature.

The hollow bar is especially useful for sleeves and bushings in pumps and valves, insulating parts in high voltage environments, flanged plain bearings for slow running shafts, spacers in high speed setups and tubular components in sterilizers and autoclaves. When you need a heavy wall and a decent inner diameter at the same time, the hollow bar is usually more economical than turning from solid material.

For machining, PEEK is pleasant to work with as long as you keep the tools sharp, the cooling plentiful and the rake angle positive. Count on a heavy wall having small internal stresses, so take the roughing cut first, let the part settle and then run the finishing cut on the critical dimensions. That way you minimize movement after the last operation.

The hollow bar in beige PEEK at 1000 mm is pre-bored, so rings and sleeves can be turned without boring out solid stock.

The hollow bar is cut to the length you want. We help work out the nearest blank dimension against your drawing so that you neither pay too much nor run short of material. Need to discuss whether a hollow bar or a solid round rod gives the lowest total cost in your case? Get in touch and we will go through it.