Sandvik Coromant 5749328 Indexable Boring Bar 1 in Shank

Product Description

The SANDVIK COROMANT 5749328 is a steel indexable boring bar from the Top Lok series, designed for precision internal boring and turning operations in machining environments. It features a 1-inch shank diameter and a 12-inch overall length, providing reach and rigidity for demanding bore applications. The right-hand cut orientation and neutral rake angle at 0 degrees make it a versatile toolholder for consistent, repeatable results. Compatible with TLG-3189L inserts secured via screw clamping, this bar is suited for shops running CNC lathes and boring mills where insert indexability and quick changeover matter.

This boring bar is intended for use in metal-cutting applications including internal boring and turning on CNC and manual lathes, machining centers, and boring mills. With a minimum bore diameter of 1.376 inches (34.95 mm), it is appropriate for medium-bore work in production and job-shop environments. The multi-use design supports both boring and turning operations from a single toolholder, reducing setup time. Machinists and toolroom technicians are the primary users of this toolholder style.

Key Features

• Top Lok series SI-style toolholder for boring and turning in a single setup
• Minimum bore diameter of 1.376 inches (34.95 mm) for medium-bore applications
• 12-inch overall length with 1-inch shank and 1-inch neck diameter for rigid overhang support
• Screw clamping insert retention for secure, repeatable insert indexing
• Neutral rake (0-degree rake angle, 0-degree lead angle) for broad material compatibility
• Accepts TLG-3189L inserts; no coolant-through feature

Compatibility

Designed for use with TLG-3189L inserts. Fits standard 1-inch bore bar holders and sleeves compatible with the SI toolholder style. Verify machine interface and insert seat dimensions before installation.

Installation Notes

Installation is performed by qualified machinists or toolroom technicians familiar with indexable tooling systems. Secure the shank in a properly sized boring bar holder or turret station before torquing insert screws to the tool manufacturer's specification using the appropriate Torx or hex key. Ensure the machine spindle is fully stopped and all power is isolated before changing inserts or repositioning the bar. Do not exceed the recommended overhang ratio for the shank diameter, as excessive overhang increases vibration and reduces surface finish quality.