Kennametal 1097511 Indexable Profiling Toolholder External

Product Description

The KENNAMETAL 1097511 is a right-hand external indexable profiling toolholder in the Top Notch series, designed for turning and profiling operations on CNC lathes and manual turning centers. Built from steel with a neutral rake geometry, it accepts NP.. series inserts with a 5/8-inch inscribed circle. The square shank measures 0.75 x 0.75 inches with an overall length of 4.5 inches, making it a compact, rigid platform for contour turning, facing, and shoulder work. Insert retention is handled by a top clamp mechanism, and the NKLC toolholder style positions the cutting edge at a -5 degree lead angle to control chip flow and reduce radial cutting forces on the workpiece.

This toolholder is suited for external turning applications in production and jobshop environments where consistent insert indexing and repeatable tool positioning are required. It is commonly used on flat-bed and slant-bed CNC lathes performing profiling, contouring, and general OD turning passes. The 0.75-inch square shank fits standard tool blocks and turret stations on mid-size turning centers. The Top Notch clamping system provides secure insert lock-down during interrupted cuts and moderate-to-heavy finishing passes.

Key Features

• External right-hand cutting orientation with -5 degree lead angle for controlled chip direction
• Accepts NP.. 51R inserts with a 5/8-inch (0.625 inch) inscribed circle
• 0.75 x 0.75 inch square steel shank fits standard turret tool blocks
• 4.5-inch overall length with 0.88-inch head length for compact turret clearance
• Top clamp insert holding method for positive seating during interrupted and continuous cuts
• Neutral rake geometry compatible with a wide range of workpiece materials

Compatibility

Compatible with NP.. 51R indexable inserts. Complete insert compatibility code: NP.. 51R. Also referenced under manufacturer number NKLCR/L1205B. Designed for use in the Kennametal Top Notch toolholding system on standard OD turning setups.

Installation Notes

Installation is performed by a machinist or toolroom technician. Ensure the lathe turret or tool block is fully powered down and the spindle is locked before mounting or indexing inserts. Torque the clamp screw to the insert manufacturer specification using a calibrated hex key. Verify tool centerline height against the spindle centerline before taking the first cut, as improper height affects surface finish and insert life.