Accupro 125990 Roughing End Mill 5/16 in 3 Flute Solid Carbide

Product Description

The ACCUPRO 125990 is a single-end roughing end mill designed for aggressive material removal in milling applications. Built from submicron-grade solid carbide, it delivers the hardness and edge retention needed for high-demand cuts. The 5/16 inch mill diameter pairs with a 0.03 inch corner radius and a chipbreaker geometry along the flute, which breaks chips into shorter segments to reduce heat buildup and cutting load. With a high-helix, spiral flute design and variable pitch, this tool helps minimize chatter during heavy roughing passes. It is used by machinists and tool-and-die professionals working in job shops, production facilities, and maintenance environments.

The 125990 is suited for roughing operations on ferrous and non-ferrous materials where chip control and tool life are priorities. The 5/16 inch straight cylindrical shank with h6 tolerance fits standard collet chucks and end mill holders in that bore size. Its 1.125 inch length of cut and 3 inch overall length make it appropriate for moderate-depth pockets, slots, and profile cuts in typical CNC and manual milling setups. The bright, uncoated finish is standard for applications where coating is not required or where regrinding is anticipated.

Key Features

• Submicron solid carbide construction for hardness and wear resistance
• Chipbreaker geometry reduces chip load and heat during roughing passes
• Variable pitch flutes help suppress chatter in aggressive cuts
• High-helix spiral flutes promote efficient chip evacuation
• Center-cutting capable, allowing plunge entry into workpieces
• Right-hand cut and right-hand flute direction for standard spindle use

Compatibility

Designed as an OEM-style replacement or direct-use roughing end mill for CNC machining centers and manual mills accepting a 5/16 inch straight cylindrical shank with h6 tolerance.

Installation Notes

Installation should be performed by a qualified machinist or tooling technician. Ensure the spindle is fully stopped and the machine is in a safe, locked-out state before changing tooling. Seat the shank fully into the collet or end mill holder to the recommended grip length and torque the retention hardware per the tool holder specification. Confirm runout with a dial indicator before initiating a cut.