Promax US007039 Square End Mill 1/4 in 4 Flute Carbide

Product Description

The PROMAX US007039 is a solid carbide square end mill designed for precision milling in metalworking and machining applications. With a 0.25-inch mill diameter, a 0.75-inch length of cut, and a 2.5-inch overall length, this tool is built for tight-tolerance work in CNC and manual milling setups. The four-flute, right-hand spiral configuration paired with a 35/38 variable helix and variable index geometry reduces chatter and harmonics during cuts. A PowerLayer coating improves wear resistance and extends tool life in ferrous and non-ferrous materials. Micrograin carbide substrate supports edge sharpness retention at elevated cutting speeds.

This end mill is suited for slot milling, profiling, and peripheral milling operations in job shops, production machining environments, and toolrooms. It is a single-end tool with a straight cylindrical shank, making it compatible with standard ER collet chucks, end mill holders, and shrink-fit tooling systems. The standard length profile fits typical milling machine and machining center spindle setups where extended reach is not required. It is centercutting, allowing direct plunge entry into the workpiece.

Key Features

• 0.25-inch mill diameter with mill diameter tolerance of +0.000 / -0.002 inches
• 0.75-inch length of cut in the 0.70 to 0.80-inch cut range
• 35/38 variable helix and variable index geometry reduces vibration and chatter
• PowerLayer coating for extended tool life and improved wear resistance
• Micrograin solid carbide substrate for edge retention at high feeds and speeds
• Centercutting design allows plunge milling without a pre-drilled entry hole

Compatibility

Designed as an OEM-style replacement and standard tooling selection for CNC machining centers and manual mills accepting a 0.25-inch straight cylindrical shank in ER collet, end mill holder, or shrink-fit tooling systems.

Installation Notes

Installation should be performed by a qualified machinist or toolroom technician. Ensure the spindle is fully stopped and the machine is in a safe, locked-out state before changing tooling. Verify collet or holder bore matches the 0.25-inch shank diameter and that runout is within acceptable limits before cutting. Consult the machine tool manufacturer and cutting tool data for appropriate feeds, speeds, and depth-of-cut parameters.