We manufacture and supply hollow round bars in three popular carbon steel grades: AISI 1018, 1020, and 1045. These seamless or welded hollow bars combine the machinability and weldability of low-to-medium carbon steels with the weight reduction and material efficiency of a tubular cross-section. Hollow bars eliminate the need to drill solid bars for applications requiring internal bores, reducing machining time, material waste, and overall cost.
Our hollow round bars are produced to tight dimensional tolerances with smooth internal and external surfaces, making them ideal for hydraulic cylinders, mechanical shafts, structural columns, conveyor rollers, and precision machinery components. Available in a wide range of outer diameters and wall thicknesses, these bars can be supplied in hot-finished or cold-drawn condition to match your specific mechanical and surface requirements.
Steel Grades
AISI 1018, AISI 1020, AISI 1045
Standards
ASTM A519, ASTM A513, ASTM A108, EN 10294-1, JIS G3445, GB/T 8162
Material Efficiency: Hollow design reduces weight by 30–60% compared to solid bars of equivalent outer diameter, lowering material costs and shipping expenses.
Reduced Machining Time: Pre-existing bore eliminates drilling operations, shortening production cycles and extending tool life.
Superior Surface Finish: Cold-drawn hollow bars offer smooth ID and OD surfaces with tight tolerances, often eliminating the need for honing or grinding.
Consistent Concentricity: Seamless manufacturing and precision drawing ensure uniform wall thickness and concentric bore alignment.
Versatile Heat Treatment: 1045 hollow bars can be quenched and tempered to achieve higher strength and wear resistance for demanding applications.
Excellent Weldability: 1018 and 1020 grades weld readily with all common processes; 1045 requires preheat and controlled cooling for critical welds.
