C/O Swiss Made 59184 CAT 45 ER40 Collet Holder, Hrc 54-60, T.i.r. <0.0002", 20K RPM

The C/O Swiss Made 59184 is a CAT 45 ER40 collet holder designed for precision workholding in CNC and metalworking applications. This tool holder features a CAT 45 taper and is compatible with the ER40 collet system, which typically supports a clamping range from 1/8 inch to 1 inch (approximately 3 mm to 26 mm). Engineered for durability and rigidity, these holders are often constructed from case-hardened alloy steel with a hardness rating between HRC 54 and HRC 60. Technical specifications for ER40 systems generally include high-speed balancing, often up to 20,000 or 25,000 RPM at G2.5, and a total indicated runout (T.I.R.) of less than 0.0002 inches at the collet face to ensure concentricity during high-speed machining, drilling, and milling operations. Many units in this category also support coolant-through functionality and utilize a 5/8-11 rear thread for pull studs. No year of manufacture was specified in the provided data.