Hertel 7000086 Indexable Boring Bar 0.93in Left Hand A-stfp

Product Description

The HERTEL 7000086 is a left-hand indexable boring bar designed for internal turning and bore finishing operations on CNC lathes and boring mills. Built from steel with a neutral rake geometry, this toolholder accepts TP-style inserts secured by a screw-clamping method. The 3/4-inch shank diameter and 10-inch overall length (OAL) give it reach for deeper bore applications, while the through-coolant design — with a 1/8-27 NPT coolant port — directs fluid directly to the cutting zone for improved chip evacuation and tool life. Minimum bore diameter is 0.93 inches, making it suitable for moderately tight bores requiring precision finishing.

This boring bar is suited for production and job-shop environments where left-hand boring operations are required. Typical applications include finish boring, semi-finish boring, and back-boring on steel, cast iron, and similar machinable materials. The A-STFP toolholder style and neutral rake angle make it a versatile choice for machinists running continuous cuts on medium-to-large CNC turning centers or horizontal boring mills. Through-coolant capability makes it especially useful in high-speed or deep-bore scenarios where chip control and heat management are priorities.

Key Features

• Left-hand holder orientation for back-boring and left-hand turning operations
• Through-coolant port with 1/8-27 NPT thread for directed coolant delivery
• Screw-clamping insert retention for secure hold under heavy cutting loads
• Neutral rake angle (0 degrees) provides versatility across a range of workpiece materials
• 3/8-inch insert inscribed circle with 5/32-inch insert thickness for TP-style compatibility
• Steel toolholder construction for rigidity and vibration damping

Compatibility

Accepts TP-style indexable inserts with a 3/8-inch inscribed circle and 5/32-inch thickness, held by screw clamp. Designed as an OEM-style replacement or direct-fit toolholder for A-STFP boring bar setups on compatible CNC turning and boring equipment.

Installation Notes

Installation should be performed by a qualified machinist following the machine tool manufacturer's setup procedures. Ensure the machine spindle is fully stopped and locked out before mounting or adjusting the toolholder. Torque the shank clamping screws to the machine turret specification and confirm insert seating before making a test cut. Connect the through-coolant supply line to the 1/8-27 NPT port using an appropriate fitting and verify for leaks before running.