Seco 00057659 Indexable Boring Bar 0.35 in Right Hand Stld

Product Description

The SECO 00057659 is a right-hand STLD indexable boring bar designed for internal turning operations on CNC lathes and manual turning centers. Built from steel, it accepts TD.. 1.2 triangular inserts held by a screw-clamp method, delivering a negative rake angle of -12 degrees and a lead angle of -5 degrees for controlled chip formation in tight bores. With a minimum bore diameter of 0.35 inches, a shank diameter of 0.312 inches, and an overall length of 4 inches, this bar is suited for small-bore finishing and semi-finishing passes where reach and rigidity must be balanced. It is installed by machinists and tooling technicians.

This boring bar is used in right-hand cutting applications where a triangular insert geometry is preferred for ferrous and non-ferrous materials. It fits tool blocks and turrets that accept a 0.312-inch round shank. The bar does not include coolant-through capability, so external coolant delivery should be planned accordingly. Compatible insert size code is 1.21.5, and the insert inscribed circle measures 5/32 inch. The catalog number for this holder is S05 STLDR-1.2, with model designation S05 STLDR. Typical applications include finish boring of hydraulic components, pump housings, and similar small-diameter features in a production turning environment.

Key Features

• Minimum bore diameter of 0.35 inches enables work in tight internal features
• Right-hand cutting direction with negative rake angle of -12 degrees for controlled cutting forces
• Screw-clamp insert holding for secure indexing and repeatable edge positioning
• Accepts TD.. 1.2 triangular inserts with 5/32-inch inscribed circle
• Steel construction provides rigidity in small-shank boring applications
• No coolant-through design simplifies tooling setup where external flood coolant is available

Compatibility

Designed for use with TD.. 1.2 STLD triangular inserts with compatible insert size code 1.21.5 and insert screw CS120. Fits tool holders and turrets accepting a 0.312-inch round shank in right-hand turning setups.

Installation Notes

This boring bar is installed by qualified machinists or tooling technicians. Power down and lock out the machine spindle before changing or indexing inserts. Secure the shank firmly in the tool block to the machine manufacturer's specified clamping method to prevent deflection during the cut. Inspect the insert seat and screw before each use to confirm seating integrity.