Description

The SECO 00040031 is an indexable ball nose end mill designed for precision milling operations in metalworking and machining environments. It features a 3/4-inch (0.750 inch) cutting diameter and a 7.000-inch overall length, with a 1-inch cylindrical shank for secure toolholder mounting. The end mill accepts two 218.20-0.375.R screw-held inserts and supports through-coolant delivery, helping to manage heat and chip evacuation during aggressive cuts. With a maximum depth of cut of 0.660 inches and a maximum ramping angle of 45 degrees, it handles both slotting and ramp-entry passes. This tool is installed and operated by machining professionals and CNC setup technicians.

The 00040031 is suited for general milling applications including contour milling, profiling, and ramp milling on ferrous and non-ferrous materials. The tapered neck geometry provides clearance during deep-reach operations. Its 2-flute configuration and ball nose profile make it appropriate for 3D surface finishing and semi-finishing passes on machining centers. The toolholder style is R218.20-Inch series, and compatible inserts follow the 218.20-0.375.R designation. This tool fits standard CNC vertical and horizontal machining centers equipped with a 1-inch bore toolholder.

Key Features

3/4-inch cutting diameter with 0.660-inch maximum depth of cut
Through-coolant capability for heat management and chip evacuation
Accepts two 218.20-0.375.R indexable inserts, screw-held retention
Tapered neck for improved clearance in deep-reach setups
Maximum ramping angle of 45 degrees supports ramp-entry toolpaths
Maximum spindle speed of 20,200 RPM

Compatibility

Compatible with R218.20-Inch series toolholders. Uses two 218.20-0.375.R ball nose inserts. Designed for use with 1-inch cylindrical bore toolholders on CNC milling machines.

Installation Notes

Installation should be performed by a qualified machinist or CNC technician. Ensure the machine spindle is fully stopped and the tool is secured in the toolholder to the correct gauge length before operation. Insert seating and screw torque should follow the insert manufacturer’s guidelines for the 218.20-0.375.R insert style. Verify through-coolant passages are clear and that coolant supply is active before running at elevated RPM.