Kennametal 1258017 End Mill Holder BT30 3/4 Inch

Product Description

The KENNAMETAL 1258017 is a BT30 taper shank end mill holder designed for CNC machining centers that require secure tool retention and internal coolant delivery. The holder accepts a 3/4 inch tool shank diameter and provides 2.36 inches of projection from the spindle face, giving machinists reliable reach for a range of milling applications. Through-spindle coolant is routed directly to the cutting zone, reducing heat buildup and extending tool life. With a clamping depth of 2.22 inches and a drawbar thread size of M12, this holder is engineered for rigid, repeatable setups on BT30-equipped machines balanced to 12,000 RPM.

This end mill holder suits vertical and horizontal machining centers fitted with a BT30 spindle interface. It is appropriate for production shops, toolrooms, and job shops running moderate-speed milling operations where coolant-through capability is required. The 1-3/4 inch nose diameter and overall length of 4.27 inches make it a practical choice for face milling, shoulder milling, and general-purpose end milling where controlled coolant flow to the cutting edge matters. Installation and tool changes are performed by licensed machinists or qualified CNC tooling technicians.

Key Features

• BT30 taper shank for direct spindle mounting on compatible machining centers
• 3/4 inch bore accepts standard end mill shanks of that diameter
• Through-spindle coolant channel routes fluid directly to the cutter
• Balanced to 12,000 RPM for stable high-speed operation
• 2.22 inch clamping depth provides secure tool grip and minimizes runout
• M12 drawbar thread for proper spindle retention

Compatibility

Designed as an OEM-style end mill holder for CNC machining centers equipped with a BT30 taper spindle interface and M12 drawbar thread.

Installation Notes

Installation should be performed by a qualified machinist or CNC tooling technician. Always power down and lock out the spindle drive before inserting or removing holders. Confirm that the spindle taper and drawbar thread match BT30 and M12 specifications before installation. Torque the drawbar to the machine manufacturer's specification and verify tool runout with a dial indicator before cutting.