Value Collection 6-901-520 Square-shoulder End Mill R8

Product Description

The VALUE COLLECTION 6-901-520 is an indexable square-shoulder end mill designed for milling operations requiring precise 90-degree shoulder cuts. Built with a 1-1/2 inch cutting diameter and a maximum depth of cut of 0.656 inches, this tool accepts three indexable inserts secured by screw-type insert holding. The R8 shank taper makes it compatible with Bridgeport-style manual mills and similarly equipped CNC knee mills. With a head length of 1.5156 inches and an overall length of 5-37/64 inches, it fits standard vertical milling setups. Machinists and toolroom operators use this style of end mill for face milling, shouldering, and slotting operations where a true 90-degree wall is required.

This end mill is suited for job shop, toolroom, and light production milling environments. The R8 shank is a common taper found on Bridgeport-style knee mills and similar vertical milling machines. The three-insert configuration provides balanced cutting load distribution at the cutter head. Coolant-through capability is not included, so flood or mist coolant delivered externally is the standard approach for heat management during cuts. Typical applications include slotting, shoulder milling, and step milling in steel, cast iron, and aluminum workpieces.

Key Features

• 1-1/2 inch cutting diameter for medium-duty square-shoulder milling
• Maximum depth of cut of 0.656 inches per pass
• R8 shank taper fits Bridgeport-style and compatible vertical knee mills
• Three indexable insert pockets with screw-type clamping for secure hold
• Compatible with TPC 32, TPG 32, and TPU 32 insert styles for flexibility
• No coolant-through — designed for external coolant delivery

Compatibility

Accepts TPC 32, TPG 32, and TPU 32 series indexable inserts. Designed for use in R8 taper spindle machines typical of Bridgeport-style vertical knee mills.

Installation Notes

Installation and tool changes must be performed with the machine powered down and the spindle fully stopped. The R8 shank requires proper drawbar torque for secure retention — follow the machine manufacturer's drawbar specification. Insert replacement should be done with the cutter removed from the spindle; use the appropriate Torx or hex key to seat screw-clamped inserts securely and evenly. Verify insert seating and pocket cleanliness before returning the tool to service.