Kennametal 1256316 Boring Bar Micrograin Solid Carbide

Product Description

The KENNAMETAL 1256316 is a solid carbide boring bar designed for precision internal turning and bore finishing operations on CNC and manual lathes. Built from micrograin carbide, it delivers the hardness and wear resistance needed for tight-tolerance bores in ferrous and non-ferrous materials. The right-hand cutting orientation suits standard spindle configurations. With a minimum bore diameter of 0.094 inches and an overall length of 1.15 inches, this bar is optimized for small-diameter, shallow-bore applications where rigidity and edge retention are critical. It is specified and installed by machinists and tooling technicians working in precision machining environments.

This boring bar is suited for small-bore internal machining in production and job-shop settings. Its compact geometry handles shallow bores up to 0.5 inches deep, making it appropriate for close-tolerance finishing passes on small hydraulic fittings, instrument housings, bearing bores, and similar workpieces. The 3.95 mm shank diameter fits compatible boring bar holders and micro-boring tooling systems. It is a single-point cutting tool sold individually and intended for setups requiring fine surface finish and dimensional accuracy in tight bore profiles.

Key Features

• Micrograin solid carbide construction for superior hardness and extended tool life
• Right-hand cutting direction for standard spindle rotation
• Minimum bore diameter of 0.094 inches enables machining of very small internal features
• Maximum bore depth of 0.5 inches suits shallow through and blind bore applications
• 3.95 mm shank diameter for compatibility with micro-boring toolholding systems
• Compact overall length of 1.15 inches reduces overhang and maximizes rigidity

Compatibility

Designed as an OEM-style replacement and standard tooling option for micro-boring bar holders accepting a 3.95 mm shank diameter in CNC turning and manual lathe setups.

Installation Notes

Installation is performed by qualified machinists or tooling technicians. Ensure the lathe or machining center spindle is fully stopped and the machine is locked out before changing tooling. Secure the shank firmly in the appropriate boring bar holder to the holder manufacturer's specified clamping procedure to prevent deflection during the cut. Verify bore diameter and depth clearances before initiating the cutting pass to avoid tool or workpiece damage.