Micro 100 TH-86 Boring Grooving Bar Holder 0.25 Id

Product Description

The MICRO 100 TH-86 is a boring and grooving bar holder designed to secure small-diameter boring and grooving bars in CNC lathes and manual turning centers. The holder accepts bars with a 0.25 inch inside diameter and features a 0.5 inch outside diameter body with a 0.625 inch head diameter, keeping the tool rigidly positioned during internal grooving and boring operations. Overall length is 2.75 inches. Weighing 0.116 pounds, the TH-86 is a compact, single-piece holder suited for tight-clearance applications where precise bar positioning is critical.

The TH-86 is used in machine shop environments for internal diameter grooving and boring on small workpieces. It is typically installed on CNC turning centers, manual lathes, and Swiss-style machines where 0.25 inch shank boring bars are in regular use. The TH Series holder design is well suited for production turning applications where repeatable tool positioning is required. Machinists and toolroom technicians performing ID grooving, threading, or profiling operations on small-bore parts will find this holder appropriate for those setups.

Key Features

• Accepts 0.25 inch inside diameter boring and grooving bars
• 0.5 inch outside diameter body for standard toolpost and turret mounting
• 0.625 inch head diameter provides positive bar retention
• 2.75 inch overall length suits compact lathe setups
• Part of the MICRO 100 TH Series holder line
• Lightweight at 0.116 pounds for easy handling and tool changes

Compatibility

Designed as an OEM-style holder for 0.25 inch shank boring and grooving bars used in CNC and manual turning applications requiring a 0.5 inch OD tool holder body.

Installation Notes

Installation is performed by qualified machinists or toolroom technicians. Power down and lock out the machine spindle before mounting or removing the holder from the turret or toolpost. Verify that the boring bar shank is fully seated and all clamping screws are torqued per the machine tool manufacturer's specifications. Confirm tool overhang and runout before initiating any cutting operation.