Tianjin Tongming Import & Export Co., Ltd. Is the operating company behind the KORRETTO and TOP-TOOL brands. Headquartered in Tianjin, China, we have focused on precision machine tool workholding and related accessories since 2008. Our mission is to help CNC shops and OEMs improve clamping accuracy, throughput, and repeatability on lathes and machining centers.

Brands and positioning KORRETTO is our primary brand for precision industrial workholding marketed globally. TOP-TOOL is used for certain product lines and regional distribution, including North American channels. Together they cover both standardized catalog items and engineered-to-order solutions.

Product scope We design, manufacture, and supply a broad range of workholding and machine-tool accessories.

Collet and flexible clamping: Rubber collet chucks (flex collets) for external clamping on CNC lathes and milling applications, high-speed pneumatic collet chucks, front-mounted pneumatic and hydraulic collets, stationary pneumatic and hydraulic collet chucks, diaphragm chucks for ultra-precision parts, and expanding mandrels for internal bore clamping.

Indexing and special chucks: Hydraulic indexing chucks for multi-face machining of valves, fittings, and similar parts; Pull-back hydraulic chucks, ball-lock chucks, oil-pipe thread chucks, and other specialized configurations for demanding geometries and industries.

Power chucks: Two-, three-, and four-jaw hydraulic chucks, rotary hydraulic cylinders, and matching soft jaws and hard jaws for flexible production.

Manual chucks: Self-centering two-, three-, four-, and six-jaw chucks, independent four-jaw chucks, heavy-duty and extra-large manual chucks, precision adjustable chucks, and welding or glass chucks where applicable.

Magnetic workholding: Electromagnetic and permanent magnetic chucks, fine-pole and powerful designs, sine tables, rotary-pole and tool-grinder chucks, vacuum and specialty magnetic solutions, and permanent magnet lifters.

Precision vises: Standard, quick-load, auto-centering, double-station, multi-workpiece, and five-axis vises for milling and machining centers, with emphasis on parallelism and repeatability.

Accessories: CNC tool holders (SK, BT/BBT, HSK hydraulic chucks and related), drill chucks, live and dead centers, dividing heads and rotary tables, and complementary abrasive and surface-prep products where we support distributors and end users.

Engineering and quality We support non-standard sizes, custom jaw designs, and application-specific fixtures. Typical inquiries include workpiece drawings, machine spindle interface, cycle time targets, and accuracy requirements. Our team provides selection guidance, installation notes, and technical documentation. Manufacturing emphasizes stable precision, consistent heat treatment, and traceable processes suitable for production environments.

Markets We serve manufacturers in automotive components, general machinery, energy and fluid control (valves and fittings), aerospace-related supply chains, and job shops worldwide. Sales and technical contact are available in Chinese and English. We welcome RFQs for both catalog and custom workholding projects.

Summary Tianjin Tongming Import & Export Co., Ltd., through KORRETTO and TOP-TOOL, delivers precision CNC workholding-from rubber collet and indexing systems to vises, magnetic chucks, and power chucks-with the flexibility to customize for your machine and your parts. Contact us for quotations, datasheets, and application engineering support.