Kennametal 1288867 Fsbi Indexable Boring Bar Right Hand

Product Description

The KENNAMETAL 1288867 is a right-hand FSBI indexable boring bar designed for precision internal turning operations in metal cutting applications. Built from steel with a positive rake geometry and a 5-degree lead angle, this boring bar delivers controlled chip flow and consistent surface finish in small-bore work. It accepts TD-style inserts held by a screw-clamp method and features through-coolant capability via a 0.040-inch coolant hole, supporting extended tool life and chip evacuation in deep-bore conditions. The 3/16-inch shank diameter and 3.5-inch overall length make it well suited for light-duty CNC turning centers and manual lathes requiring tight bore access.

This boring bar is intended for use in precision machining environments where minimum bore diameter access and through-coolant delivery are critical. It is appropriate for shops running small-diameter internal features on ferrous and non-ferrous workpieces. The 0.275-inch minimum bore diameter and 3/4-inch maximum bore depth define its envelope for short, small-diameter internal turning passes. Machinists and CNC programmers working on Swiss-style, gang-tool, or standard turret lathes will find this bar fits standard tool block setups for 3/16-inch shank holders.

Key Features

• Minimum bore diameter of 0.275 inches for small-bore internal turning
• Maximum bore depth of 0.75 inches (3/4 inch) limits reach to rigid, chatter-free cuts
• Through-coolant design with 0.040-inch coolant hole for chip evacuation and heat control
• Positive rake at 5-degree lead angle reduces cutting forces on light-duty setups
• Screw-clamp insert retention for repeatable TD-style insert indexing
• Steel construction with 3/16-inch shank diameter fits standard small-bore tool holders

Compatibility

Designed for use with TD-style FSBI series inserts with a 0.160-inch inscribed circle and 0.047-inch insert thickness. Manufacturer catalog reference A03GSTLDR128. No additional compatible model numbers were specified in the product data.

Installation Notes

Installation should be performed by a qualified machinist or CNC setup technician. The machine spindle must be fully stopped and the turret or tool post must be locked out before mounting or indexing inserts. Use a calibrated torque driver when tightening the clamping screw to avoid insert seat damage — refer to the insert manufacturer torque specification for TD-style screw-clamp tooling. Confirm through-coolant line pressure compatibility with your machine tool before engaging coolant-through mode.