Seco 00057661 Indexable Boring Bar 0.29 in Right Hand

Product Description

The SECO 00057661 is a heavy metal indexable boring bar designed for internal boring and turning operations on CNC lathes and manual turning centers. Built on a 1/4-inch diameter shank with a 4-inch overall length, it accepts TD.. 1.2 series triangular inserts held in place by a screw-clamp method. The STLD toolholder style delivers a -5 lead angle and a negative rake geometry, positioning the cutting edge 0.165 inches from center. The heavy metal body dampens vibration in small-bore applications, making it a reliable choice for precision internal diameter work in production and job-shop environments.

This boring bar is suited for residential and commercial machine shop use wherever small-bore internal turning is required. With a minimum bore diameter of 0.29 inches, it reaches tight bore diameters that standard steel shanks cannot enter without chatter. It handles both boring and turning applications per its rated cutting tool application, covering a wide range of materials when paired with the appropriate TD.. 1.2 insert grade. Right-hand cut orientation is standard for conventional lathe rotation. The bar is a single-use toolholder — not configured for multi-use tool setups.

Key Features

• Heavy metal shank body reduces vibration in small-bore, long-reach internal turning
• Minimum bore diameter of 0.29 inches for tight-clearance applications
• Screw-clamp insert holding method for secure, repeatable edge indexing
• Compatible with TD.. 1.2 triangular inserts, 5/32-inch inscribed circle, 0.047-inch thickness
• Negative rake angle with -5 lead angle for stable chip control
• Right-hand cut, STLD toolholder style for standard lathe rotation

Compatibility

Accepts TD.. 1.2 series triangular inserts with a 5/32-inch inscribed circle and a compatible insert size code of 1.2 / 1.5. Insert screw CS120 is used for clamping. Not compatible with coolant-through setups.

Installation Notes

Installation is performed by qualified machinists or tooling technicians. Power down and lock out the machine spindle before changing inserts or setting tool offsets. Ensure the shank is clamped securely in the tool turret or boring bar holder to the full grip length to minimize deflection. Follow the machine tool manufacturer torque guidelines for the insert clamping screw — do not overtighten the CS120 screw, as triangular insert ears are prone to fracture under excessive clamp force.