Precision Twist Drill 8553065 Turning Insert Cnmg 12

Product Description

The PRECISION TWIST DRILL 8553065 is a double-sided negative turning insert designed for metal cutting and lathe operations. Manufactured in grade T8415, this CNMG-style insert features an 80-degree rhomboid geometry with an inscribed circle diameter of 12.7 mm and a thickness of 4.76 mm. The 0.8 mm nose radius and RM chip-breaker with rounded cutting edges support controlled chip evacuation during turning operations. Indexing accuracy meets ISO tolerance class M. Licensed machinists and CNC operators install these inserts on compatible indexable toolholders in production and job-shop environments.

This insert is suited for general turning applications on ferrous and non-ferrous materials where a negative rake geometry is required. The T8415 grade is formulated for turning operations that demand wear resistance and edge stability. The RM chip-breaker geometry accommodates medium-depth cutting passes and is a common choice in both manual lathe and CNC turning center setups.

Key Features

• Double-sided negative insert design — doubles usable cutting edges per insert
• 80-degree rhomboid (CNMG) geometry for versatile turning applications
• Inscribed circle diameter: 12.7 mm with 4.76 mm insert thickness
• 0.8 mm nose radius for balanced surface finish and edge strength
• RM chip-breaker with rounded cutting edges for controlled chip formation
• ISO tolerance class M indexing accuracy for consistent, repeatable positioning

Compatibility

Designed as an OEM-style replacement or direct-fit insert for indexable turning toolholders accepting CNMG-style inserts with a 12 mm inscribed circle diameter in standard negative-rake toolholder pockets.

Installation Notes

Installation is performed by qualified machinists or CNC tooling technicians. Ensure the machine spindle is fully stopped and the toolholder is secured in the turret or tool post before seating or indexing the insert. Use the appropriate torx or clamp screw specified by the toolholder manufacturer to achieve correct clamping force — do not overtighten by feel alone. Follow the toolholder manufacturer's indexing procedure to confirm the insert is fully seated before resuming cutting operations.