The Difference Between Round Bar, Drill Rod and
2016-5-27 · Oil Hardened Drill Rods. Oil hardened drill rods are easily welded and machined and are very tough and durable. During the oil hardening process, the rod is heated until glowing red then plunged into a vat of warm oil. This causes the surface to become extremely hard. Oil hardened drill rods are used for general tool making. Shafting
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