4340 square bar steel in u s a
4340 (E4340) Alloy Steel, AISI 4340, Plate, Round Bar AQ As one of the most focused 4340 steel suppliers in the U.S. your search ends here. 4340 steel plate from BenedictMiller, LLC all meets aircraft quality standards. Circles, rounded plate (plate rounds) or flat bar can all be cut in house from our 4340 plate in stock. Note: 4340 steel flat bar is not extruded bar but is often fit for function.