The ER20 RF sealed collets with neoprene inserts are designed for reliable clamping of tools with through-coolant supply in ER collet chucks according to DIN ISO 15488 (DIN 6499) standards.

These collets ensure an effective coolant seal thanks to neoprene sealing inserts integrated in the 30° taper of the collet. The elastomer sealing system prevents coolant leakage during machining operations and directs the coolant flow directly through the internal coolant channels of the cutting tool, improving cooling efficiency and chip evacuation.

The collet body features a 4+4 slot design, which provides optimal elasticity and a uniform distribution of clamping forces. This construction ensures a runout accuracy of up to 0.008 mm, which is essential for precision machining applications on CNC machining centers, milling machines and high-speed spindles.

The ER20 RF system offers a clamping range from 3 to 13 mm with a collapse capacity of 0.1 mm, ensuring secure and stable tool holding during machining operations. Proper coolant sealing is achieved only when the tool shank matches the nominal diameter of the collet and is inserted along the full clamping length.

These sealed collets are suitable for coolant pressures of up to 25 bar, making them ideal for high-performance machining where internal coolant supply improves tool life, surface finish and cutting stability.

Through-coolant supply also improves chip evacuation, reducing chip accumulation in the cutting zone and increasing machining reliability and process stability.

ER20 RF collets can be used with eccentric extraction clamping nuts, allowing easier mounting and removal of the tool while improving efficiency during tool change operations.

Thanks to their high precision and coolant sealing capability, these collets are widely used in precision machining, CNC manufacturing, automotive production, mold and die making, and advanced mechanical engineering, where accuracy, repeatability and process reliability are essential.