Vortex Closing Screw for Turning Tool Holders/Boring Bars (G1/8) is a compact fastener that securely clamps cutting tools in place during turning and boring operations. It’s built for machinists, engineers, hobbyists, and workshop professionals who need dependable tool retention with straightforward installation.

From Vortex Tools, a Protool own brand, this closing screw is sourced from trusted manufacturers worldwide to provide reliable tooling components you can count on.

• G1/8 thread compatibility: standard size that fits a wide range of turning tool holders and boring bars, enabling quick tool changes and a secure, consistent seating.
• Secure, repeatable clamping: precise engagement and robust design minimize tool movement under load, helping reduce chatter and improve cut quality.
• Brand-backed reliability: part of the Vortex Tools Protool line, delivering consistent quality and easy access to replacements for steady, uninterrupted workflows.

Using this closing screw helps you tighten tool seating quickly, keeps setups repeatable, and supports higher productivity by reducing downtime and ensuring stable performance across multiple jobs.