STRENGTH, PRECISION, EFFICIENCY

The retention knob is a key ingredient not only to the overall performance of the tool holder and cutting tool life, but also to maintain a safety standard on any machine shop floor. We choose SNCM420 (SAE 4320) alloy steel, with high nickel alloy content, for its high tensile strength to withstand strong centrifugal force, high load force, high feed rate, and difficult-to-machine material in the era of current CNC machining environment. The ultimate tensile strength of SNCM420 alloy steel is 980 MPa and our material is made in Japan by a very reputable steel manufacturer. To maintain the tight tolerance of key dimension on a retention knob, we integrate the Marposs Unimar S measurement head which has a repeatability within 0.1 micron into our grinding process. To further maximize production output, we utilize robotic arms to load and unload a retention knob bar stock into a CNC grinder. Additionally, our retention knobs are roll threaded which provides higher strength and excellent thread quality, compared to others which are cut threaded.