Micro 100 TH-85 Boring Grooving Bar Holder 2.75 Inch

Product Description

The MICRO 100 TH-85 is a boring and grooving bar holder designed to secure small-diameter boring and grooving bars in CNC lathes and turning centers. Part of the TH series, this holder accepts bars with an inside diameter of 0.1875 inches (3/16 inch) and features an outside diameter of 0.5000 inches with a head diameter of 0.6250 inches. The overall length is 2.75 inches (2-3/4 inch). Machinists and tool-room technicians use this holder in precision internal machining operations where consistent bar retention and concentricity are critical.

This holder is suited for light-duty internal boring and grooving applications on CNC turning equipment and manual lathes where small-shank tooling is required. The TH series geometry is sized for compact workholding setups, making it a practical choice for production and toolroom environments handling small-bore work. It does not include coolant-through capability, so it is best applied in operations where flood or mist coolant delivery is handled externally.

Key Features

• Inside diameter of 0.1875 inches (3/16 inch) for precise bar retention
• Outside diameter of 0.5000 inches for standard toolholder compatibility
• Head diameter of 0.6250 inches for positive seating
• Overall length of 2.75 inches suits compact turret and toolpost setups
• No coolant-through design simplifies setup on standard turning equipment
• Part of the TH series for consistent fit across MICRO 100 boring bar tooling

Compatibility

Designed as an OEM-style replacement and standard fitment for CNC lathe and turning center toolholding systems that accept 0.5000-inch outside diameter boring and grooving bar holders with a 0.1875-inch bore.

Installation Notes

Installation is typically performed by a machinist or toolroom technician. Power down and lock out the machine spindle before seating or removing any toolholder. Ensure the bore and seating surfaces are clean and free of chips before installation. Follow the machine manufacturer torque guidance for set screws or clamping hardware used to secure the holder in the turret or toolpost.