Collis Tool 68036 End Mill Holder NMTB30 3/4 in Bore

Product Description

The COLLIS TOOL 68036 is an end mill holder designed to securely grip end mills in milling machines equipped with an NMTB30 taper spindle. The holder features a 3/4-inch bore diameter and a 1-3/4-inch nose diameter, with a 2.125-inch projection from the spindle face to the tool tip. These dimensions position the cutting tool accurately for consistent material removal and repeatable depth of cut. The 1/2-13 drawbar thread engages the machine spindle to lock the holder in place during operation. This holder is installed by machinists and CNC setup technicians working with vertical milling machines, knee mills, and similar NMTB30-equipped tooling systems.

The 68036 is suited for use in job shops, maintenance machining environments, and production cells where NMTB30 tooling is the standard. It accepts 3/4-inch shank end mills and is appropriate for face milling, slotting, and peripheral milling operations in ferrous and non-ferrous materials. The 2.125-inch projection accommodates tooling reach requirements common in general-purpose vertical milling setups. No through-coolant port is present, making it most appropriate for air-blast or flood coolant applied externally at the cutting zone.

Key Features

• NMTB30 taper shank for direct mounting in NMTB30 spindle machines
• 3/4-inch bore diameter accepts standard 3/4-inch shank end mills
• 2.125-inch projection for adequate tooling reach in typical milling operations
• 1-3/4-inch nose diameter provides solid clamping support at the tool interface
• 1/2-13 drawbar thread for secure spindle retention
• No through-coolant - compatible with external flood or air-blast coolant delivery

Compatibility

Designed as an OEM-style end mill holder for milling machines with an NMTB30 taper spindle accepting a 1/2-13 drawbar thread and 3/4-inch shank tooling.

Installation Notes

Installation is performed by a machinist or tooling technician. De-energize and lock out the milling machine before mounting or removing any tooling holder. Clean the spindle taper and holder taper with a lint-free cloth before seating to ensure full contact and minimize runout. Torque the drawbar to the machine manufacturer's specification - do not use a value not documented for your specific machine. Verify tool runout with a dial test indicator after installation before beginning any cutting operation.