Accupro 75289561 Vbmt Carbide Turning Insert VBMT331

Product Description

The ACCUPRO 75289561 is a VBMT-style carbide turning insert designed for external and internal turning operations on CNC lathes and turning centers. The insert features a 35-degree diamond (rhombic) shape, a CVD coating in grade ACP25M, and a neutral hand orientation. With a 0.0315-inch corner radius and a positive side clearance, it is engineered for finishing and semi-finishing passes. The XM1+ chip breaker geometry controls chip flow across a range of feeds and depths, making this insert suitable for machinists and tool-room technicians running production turning applications.

This insert is suited for turning steel, stainless steel, and cast iron workpieces across light to moderate material removal applications. The ACP25M grade targets high wear-resistance in steel (P) and balanced wear-resistance with toughness in stainless steel (M) and cast iron (K) applications. Typical use cases include OD turning, facing, and light profiling in job shop and production environments. The screw-clamping insert-holding method is compatible with standard VBMT toolholders found in most CNC turning setups.

Key Features

• VBMT insert style with 35-degree diamond shape for access to tight profiles and shoulders
• CVD-coated ACP25M carbide grade — high wear-resistance in steel, balanced performance in stainless and cast iron
• XM1+ chip breaker for controlled chip formation across a range of depths of cut
• Positive side clearance reduces cutting forces during light to moderate passes
• Neutral hand orientation fits right-hand and left-hand VBMT toolholders
• Screw-clamped insert-holding method for secure, repeatable seating

Compatibility

Designed for use in standard VBMT screw-clamp toolholders. ANSI insert code VBMT331; ISO insert code VBMT160404. Compatible with toolholders accepting a V-shape insert with a 0.1732-inch hole diameter and a 0.1874-inch insert thickness.

Installation Notes

Insert installation and replacement should be performed by a qualified machinist or tooling technician. Power down and lock out the machine spindle before indexing or replacing inserts. Use the correct torque screwdriver for the insert clamping screw to avoid cracking the carbide substrate — do not over-tighten by hand or with standard hex keys unless the toolholder manufacturer specifies otherwise. Inspect the insert pocket and clamping screw for wear or debris before seating a new insert.