Kennametal 1878090 Cutoff Blade Tool Block A2TZN

Product Description

The KENNAMETAL 1878090 is an indexable cutoff blade tool block designed for parting and grooving operations on CNC lathes and turning centers. Built to Style A2TZN geometry, it accepts blades with a compatible blade height of 32mm (1.2598 inches) and features a reversible design that extends tooling life by allowing the block to be flipped when one side wears. With a shank height and shank width both measuring 1.25 inches and an overall length of 4.33 inches, this block is sized for rigid, stable clamping in standard tool posts. Licensed machinists and CNC operators working in production turning environments are the primary users.

This tool block is suited for production turning applications requiring consistent, repeatable cutoff performance. It is compatible with A2 Cut-Off Series blades and is configured for neutral insert cutting direction, making it appropriate for standard right-to-left infeed cutoff cycles. The block does not include coolant-through capability, so external coolant delivery should be arranged when cutting heat-sensitive materials. Typical applications include bar stock parting, groove turning, and face grooving on manual or CNC lathes in job shop and production environments.

Key Features

• Style A2TZN tool block accepts 32mm compatible blade height inserts
• Reversible design doubles usable tool block life
• Neutral insert cutting direction for standard cutoff cycles
• 1.25 inch square shank fits common tool post holders
• No coolant-through passages — simplified setup with external coolant
• Overall length of 4.33 inches provides adequate overhang clearance for most turning centers

Compatibility

Designed for use with A2 Cut-Off Series indexable cutoff blades with a compatible blade height of 32mm. Verify tool post bore and clamping dimensions against the 1.25 inch square shank before installation.

Installation Notes

Installation should be performed by a qualified CNC machinist or toolroom technician with the machine in an E-stop or powered-down state and all rotating components fully stopped. Secure the shank in the tool post to the tool post manufacturer's recommended clamping procedure, ensuring the block seats squarely without rocking. Confirm blade seating and insert torque per the blade manufacturer's specifications before taking a cut. Inspect the block for wear or damage each time the blade or insert is changed.