Kennametal 1937990 Indexable Boring Bar Right Hand Csbi

Product Description

The KENNAMETAL 1937990 is a right-hand CSBI-style indexable boring bar designed for precision internal turning and boring operations on CNC and manual lathes. Built from steel with a positive rake geometry and a 5-degree lead angle, this tool delivers consistent chip formation and smooth bore finishes in tight-tolerance applications. The 1/2-inch shank diameter and 2.75-inch overall length make it well suited for small-bore work, with a minimum bore diameter of 0.23 inches and a maximum bore depth of 1 inch. Through-coolant capability helps manage heat and chip evacuation during continuous cuts.

This boring bar is intended for machining professionals performing small-diameter internal boring on ferrous and non-ferrous workpieces in production or job-shop environments. The screw-lock insert holding method provides secure insert clamping and repeatable tool nose positioning. Compatible inserts include CDC and CSBI insert styles. The Series C designation places this bar within a standardized toolholder family commonly found in precision turning cells.

Key Features

• Minimum bore diameter of 0.23 inches enables work in very small internal diameters
• Maximum bore depth of 1 inch with a compact 2.75-inch overall length
• Through-coolant design with a 0.04-inch coolant hole diameter for active chip and heat management
• Positive rake angle (5 degrees) reduces cutting forces and promotes clean chip flow
• Screw-lock insert retention for consistent seating and quick index changes
• Steel construction provides rigidity in standard boring bar applications

Compatibility

Accepts CDC and CSBI style inserts with an inscribed circle of 0.156 inches and an insert thickness of 0.04 inches. Manufacturer catalog reference number A3208XSCLDR121. Designed as an OEM-style replacement or direct fitment for CSBI-series indexable boring bar setups.

Installation Notes

Installation should be performed by a qualified machinist or toolroom professional. Secure the shank fully within the tool holder bore and verify that the insert is properly seated and the clamping screw is torqued according to the insert manufacturer guidelines before initiating a cut. Ensure through-coolant supply lines are connected and clear before enabling coolant flow. Never exceed the manufacturer-specified bore diameter or depth range for this toolholder.