Carbon Steel Long Cylindrical Shaft with Knurled Extension Rod and Internal Hollow Socket

Carbon steel grade selection for a knurled extension rod balances machinability against the torque load the knurled grip zone must transmit; a free-machining grade produces a sharper knurl tooth profile under standard CNC turning parameters compared to higher-carbon grades where tip sharpness deteriorates faster as the knurling tool wears. Ningbo Bhin Precise Machinery (established 2009, Ningbo, Zhejiang) turns this carbon steel knurled extension rod with internal hollow socket using CNC turning, with knurl OD, socket bore depth, and overall length held to your drawing tolerances. IATF16949 and ISO 9001 certification at Bhin's Ningbo facility (roughly 4,000 m²) covers traceability for power tools, construction, and consumer electronics extension rod applications. Chemical plating and black oxide are available for surface protection. Typical end markets include aerospace, medical equipment, and robotics. We can quote once we have knurl pitch, OD, socket bore dimensions, and material grade from your drawing.