Seco 00012888 Indexable Turning Toolholder MVJNR-20-4D

Product Description

The SECO 00012888 is a right-hand indexable turning toolholder in the MVJN style, designed to accept VNMG 432 inserts secured by a top clamp holding method. It features a 1.25-inch square shank and an overall length of 6 inches, making it a rigid, direct-fit solution for external turning operations on CNC lathes and manual turning centers. The negative rake geometry (-4 degrees rake angle) supports interrupted cuts and harder workpiece materials. Installation and setup are performed by machinists and CNC operators in production and job-shop environments.

This toolholder is suited for a wide range of turning applications across multiple workpiece material categories, including steel, stainless steel, cast iron, non-ferrous alloys, high-temperature alloys, and other universal material groups as indicated by material codes H, K, M, N, P, and S. It is part of the SECO Multi-Directional Turning (MDT) series, which is optimized for external right-hand cutting direction in both roughing and finishing passes.

Key Features

• MVJN toolholder style with right-hand cutting direction and negative rake for stable, high-force cuts
• Accepts VNMG 432 inserts with a 0.5-inch inscribed circle via top clamp retention
• 1.25 x 1.25 inch square shank for rigid machine interface
• 6-inch overall length with 2-inch head length and 1.5-inch back-of-bar to cutting edge dimension
• Compatible with universal workpiece material groups: H, K, M, N, P, S
• Part of the SECO Multi-Directional Turning (MDT) series

Compatibility

Designed for use with VNMG 432 inserts (compatible insert size code VN43) with a 0.5-inch inscribed circle. Fits standard 1.25 x 1.25 inch shank tool blocks and turrets on CNC lathes and turning centers configured for right-hand external turning.

Installation Notes

Installation is performed by a qualified machinist or CNC setup technician. Confirm the machine turret or tool block accepts a 1.25 x 1.25 inch shank before mounting. Ensure the machine spindle is fully stopped and the control is in an e-stop or safe state before changing toolholders or inserts. Torque the clamp screw according to the insert manufacturer's specification for the clamp style used; do not overtighten, as this can damage the insert seat.