Premium 40CR collet extension rod — engineered for stable, high-precision finishing in CNC milling and engraving. Key benefits Exceptional durability and wear resistance: Made from high-quality 40CR steel to withstand prolonged industrial use and maintain performance over time. Ultra-high machining accuracy: Straight shank design with 0.01 mm tolerance delivers reliable, repeatable results for critical finishing operations. Deep-reach capability without compromise: Extension geometry allows access to deep cavities and extended reach while preserving stability and cutting accuracy. Reduced vibration, improved surface quality: Precisely ground to minimize unbalance, improving tool stability and the quality of machined parts. Function and compatibility Intended for use with collet-equipped CNC milling and engraving setups for finishing and fine-detail work. Designed to maintain concentricity and accuracy during high-precision cutting and engraving tasks. Performance highlights Material: 40CR steel for strength and wear resistance. Design: Straight shank for stable clamping and consistent alignment. Accuracy: 0.01 mm ultra-high precision for finishing operations. Balance: Accurate grinding to reduce unbalance and vibration during cutting. Typical applications Precision finishing of small metal components where surface quality and tight tolerances matter. Deep cavity machining for mold and die work, where extended reach is required without losing accuracy. Fine engraving and detail milling on metal parts for tooling, prototypes, and small-batch production. Why this product solves common problems Prevents premature wear and deformation in long production runs through robust 40CR construction. Eliminates excessive tool runout and vibration with 0.01 mm accuracy and accurate grinding, improving part consistency and finish. Enables access to deep or hard-to-reach features while maintaining the stability needed for critical finishing steps. Specifications (as provided) Material: 40CR steel Shank: Straight shank design Accuracy: 0.01 mm ultra-high precision Use this collet extension rod when you need reliable, wear-resistant tooling that preserves precision and stability during demanding finishing and deep-reach machining tasks.