Accupro 75257105 Turning Insert DCMT21.51 Carbide Cvd

Product Description

The ACCUPRO 75257105 is a DCMT-style carbide turning insert designed for precision external turning operations on CNC and manual lathes. It carries the ANSI code DCMT21.51 and ISO code DCMT070204, features a 55-degree diamond (rhombic) insert shape, and is finished with a CVD coating in manufacturer grade ACP25M. The insert uses a positive side clearance geometry and a WM+ chip breaker, making it well suited for moderate to high-speed finishing and semi-finishing passes. It is sold individually with a minimum order quantity of 10 units and weighs approximately 0.01 pounds.

This insert is intended for turning steel, stainless steel, and cast iron workpieces in production and job-shop environments. The ACP25M grade spans high wear resistance through moderate toughness across P, M, and K ISO material classifications, giving machinists flexibility across a range of workpiece materials. Typical applications include contour turning, profiling, and light interrupted cuts where a sharp, neutral-hand insert with a small corner radius is required for dimensional accuracy.

Key Features

• DCMT diamond insert shape with 55-degree included angle for tight-corner profiling capability
• CVD coating on ACP25M carbide grade for extended tool life on steel, stainless steel, and cast iron
• 0.40 mm (0.0157 inches) corner radius for fine-finish and close-tolerance turning
• WM+ chip breaker geometry optimized for moderate to high-speed finishing passes
• Positive side clearance and neutral hand for broad toolholder compatibility
• Screw-clamping insert holding method for secure, repeatable seating

Compatibility

Designed as a direct-fit replacement for DCMT21.51 and DCMT070204 insert seats on compatible screw-clamp toolholders that accept a 0.25-inch inscribed circle DCMT insert. Confirm toolholder pocket specifications before ordering.

Installation Notes

Insert replacement should be performed by a qualified machinist with the machine spindle fully stopped and all energy sources locked out per facility LOTO procedures. Use the appropriate torx or hex key to the toolholder manufacturer's recommended seating procedure when tightening the clamp screw. Inspect the insert pocket and clamp for wear or damage before seating a new insert. Never overtighten the clamp screw, as this can fracture the carbide substrate.