Seco 00071714 Mvjn Negative Rake Indexable Turning Toolholder

Product Description

The SECO 00071714 is a right-hand MVJN-style negative rake indexable turning toolholder designed for use on CNC and manual lathes in metal cutting operations. It features a 1 x 1 inch square shank and an overall length of 6 inches, making it suitable for a wide range of turning center setups. The toolholder uses a clamp-and-pin (Multiple Lock) insert holding method and accepts VN..33.. style inserts with a 3/8 inch inscribed circle. A negative rake angle of -12.8 degrees and a -3 degree lead angle are built into the geometry. The body is constructed from steel for rigidity under heavy cutting loads. Licensed machinists and CNC setup technicians are the primary installers.

This toolholder is intended for right-hand turning operations across a broad range of workpiece materials, including steel, stainless steel, cast iron, non-ferrous alloys, and superalloys — corresponding to material codes H, K, M, N, P, and S. The -3 degree lead angle suits general-purpose external turning where controlled chip direction and consistent insert engagement are required. It is well suited to production turning environments where repeatable tool offsets and quick insert indexing are priorities. The back-of-bar to cutting edge distance is 1.25 inches, which must be accounted for during tool offset entry.

Key Features

• MVJN toolholder style with right-hand cutting direction and negative rake geometry
• Multiple Lock insert retention system using clamp and pin for secure insert seating
• Accepts VN..33.. inserts (compatible insert size code VN33, 3/8 inch inscribed circle)
• 1 x 1 inch square steel shank with 6 inch overall length
• Rake angle of -12.8 degrees; lead angle of -3 degrees
• Universal primary workpiece material compatibility (H, K, M, N, P, S material codes)

Compatibility

Accepts VN..33.. style indexable inserts with a compatible insert size code of VN33 and a 3/8 inch inscribed circle. Manufacturer catalog reference: MVJNR163D.

Installation Notes

Installation is performed by a qualified machinist or CNC setup technician. Before mounting or indexing inserts, ensure the machine spindle is locked and all axes are at a safe position. Verify that the toolholder shank seats fully and squarely in the turret pocket or tool block before tightening. Follow the machine tool manufacturer torque specifications for the turret clamping hardware; do not rely on feel alone when securing the toolholder.