SBHA series inner diameter auxiliary tool holder for CNC lathes. Available in SBHA16, SBHA20, SBHA25, SBHA32, SBHA40 and SBHA50. Key features - Tool sleeve with an inner hole guide sleeve holder for precise alignment - Robust construction from 40CrMo steel with HRC58 or an alternative 42CrMo steel with HRC58 What it does - Holds milling cutters securely with accurate inner diameter guidance - Improves rigidity and reduces runout for cleaner finishes and longer tool life Why it matters - High wear resistance and stable performance in demanding milling tasks - Compatible with standard milling cutter shanks and common CNC lathe configs Materials and options - 40CrMo steel HRC58 or 42CrMo steel HRC58 to match cutting force and duty Usage scenarios - Finishing grooves and pockets on turned parts with tight tolerances - Internal bore milling where precise guide alignment is required - Slot and face milling on CNC lathes using common milling cutters Size and compatibility tips - Choose the size by the required cutter diameter and the available inner diameter - Model SBHA covers typical CNC lathe milling applications with standard tooling setups