The BT40-FMB 27–45 is a premium hydraulic expansion tool holder from Nanocut Technologies, engineered for exceptional runout accuracy (<3 µm), dynamic balance (G2.5 @ max RPM), and consistent clamping force across the 27–45 mm collet range. Designed for BT40 spindle interfaces, it delivers superior vibration damping, extended tool life, and repeatable precision in high-speed milling, drilling, and finishing applications. Features corrosion-resistant hard-anodized aluminum body, integrated hydraulic fluid chamber with maintenance-free seal design, and ISO 1940-1 certified balancing. Ideal for aerospace, medical, and mold & die machining where micron-level accuracy is critical.