Value Collection 210-0105 End Mill Holder R8 3/8 Inch

Product Description

The VALUE COLLECTION 210-0105 is an R8 taper shank end mill holder designed for use in milling machines that accept the R8 spindle standard. It provides a secure, concentric grip on end mills with a 3/8 inch bore diameter and features a 48 mm projection from the spindle face to the tool seat. This holder is a standard workholding accessory used by machinists and tool-and-die professionals to mount end mills, slot drills, and similar cutting tools in vertical knee mills and similar machine tools. The straight-bore design requires a drawbar to retain the R8 shank in the spindle during operation.

This end mill holder is suited for general-purpose milling applications in machine shops, maintenance facilities, and production environments. It is compatible with vertical milling machines equipped with an R8 spindle, which is the predominant spindle standard on Bridgeport-style knee mills and many similar manual and CNC knee-type machines. The 3/8 inch hole diameter accommodates commonly used fractional end mills in that shank size. The 48 mm projection positions the cutting tool at a standard working distance from the spindle nose, supporting a wide range of workpiece setups.

Key Features

• R8 taper shank for direct fit into R8-spindle milling machines
• 3/8 inch bore diameter seats standard fractional-shank end mills
• 48 mm projection from spindle face to tool seat
• No through-coolant port — solid body construction
• Weighs 0.94 pounds for minimal spindle load

Compatibility

Designed as an OEM-style replacement and standard accessory for vertical milling machines equipped with an R8 taper spindle. No specific model compatibility data was provided by the manufacturer for this part number.

Installation Notes

Installation is performed by a qualified machinist or toolroom professional. Before mounting or removing the holder, the machine spindle must be fully stopped and the power locked out per shop safety procedures. The R8 shank is secured in the spindle using the machine drawbar, which must be tightened to the machine manufacturer's specification before initiating a cut. Inspect the bore and taper surfaces for chips or burrs before assembly to ensure accurate tool runout.