25mm S20Q STIR Indexable Drill Bar STI For IR/ER Indexable Inserts, 20mm Shank 180mm Overall - Teknik Makina

Take advantage of the combination of precise internal turning, a rigid 20 mm shank and compatibility with 16 IR indexable inserts to improve cycle stability and reduce rework. Order the K354TM boring bar directly via Metav Werkzeuge or consult our specialists for application-specific setup.

K354TM boring bar (S20Q STIR) — STI for IR/ER indexable inserts, 25 mm diameter

The K354TM boring bar is a right-hand internal turning tool designed for STI holders and compatible with 16 IR indexable inserts, suited for workshop and CNC operations requiring controlled bore finishing

• 25 mm cutting diameter for internal bores
• 20 mm shank for rigid toolholder fit
• Compatible with 16 IR indexable inserts
• 180 mm overall length for deep reach

Improved process stability through dimensional control

The combination of a 25 mm cutting diameter and a 20 mm shank gives measurable gains in rigidity, translating into more consistent bore geometry and fewer rejected parts. Where internal turning requires tight tolerances, the STI interface for IR16 inserts minimises play between insert and pocket; this stabilisation reduces chatter and helps maintain surface finish across batch runs. For operations converting from brazed or solid tools to indexable tooling, this configuration balances ease of insert replacement with maintained cutting performance.

Robust design that supports longer tool life and predictable cycles

Engineered with the ISO designation S20Q STIR, the bar offers a compact profile and a 180 mm overall length that delivers reach without excessive overhang. Right-hand cutting geometry is optimised for common lathe set-ups and supports conventional feed strategies. The tool’s mass (0.436 kg) contributes to damping while remaining light enough for responsive spindle dynamics. Use of standard IR16 clamping interfaces ensures inserts seat consistently, which both lowers setup times and preserves insert life by preventing micro-movements that accelerate wear.

Practical integration into workshop workflows

This tool is suited to production environments and skilled workshops that require repeatable internal turning solutions. The STI-compatible design simplifies insert changes and toolstock management when paired with standard IR/ER holders. As part of a coordinated tooling strategy, the bar reduces downtime for regripping and enables rapid changeovers. For teams refining cycle time and surface specification, the tool’s stable interface aids in predictable machining and easier process documentation for quality control.

Discuss machining requirements with Metav Werkzeuge to specify inserts and holder set-up for the K354TM boring bar and ensure optimal performance in the intended application; contact Metav Werkzeuge by e‑mail or phone for technical advice and order placement

Technical data

• SKU: K354TM
• Manufacturer: Teknik Cutting Tools
• Product: Boring bar (Bohrstange)
• ISO designation: S20Q STIR
• Type: STI for IR/ER indexable inserts

Measurements

• Cutting diameter: 25 mm
• Shank diameter: 20 mm
• Cutting edge height: 40 mm
• Overall length: 180 mm
• Weight: 0.436 kg
• Cutting direction: right-hand

Special features

• Compatible inserts: 16 IR
• Toolholder reference: IR16
• eClass: 21180806

FAQ

Which inserts fit this boring bar?
The K354TM boring bar accepts 16 IR indexable inserts and is specified for STI-style insert seats to suit IR/ER insert geometries.

Is the cutting direction suitable for standard lathe operations?
Yes, the tool features a right-hand cutting orientation, compatible with conventional internal turning set-ups on most lathes and CNC turning centres.

What is the ISO designation and why does it matter?
The ISO designation S20Q STIR identifies the bar’s shank and insert interface standard, helping to ensure correct holder compatibility and predictable clamping behaviour in STI systems.

How deep can this bar reach reliably?
With an overall length of 180 mm, the bar is designed for moderate-depth internal turning where a balance between reach and rigidity is required; reach must be assessed relative to machine and holder overhang.

Which toolholder should be used with the K354TM?
Use an IR16-compatible holder or an STI-type adapter designated for IR/ER inserts to maintain correct clamping and insert seat stability.

Manufacturer: Teknik Cutting Tools, Buyukkayacık OSB Mah.422 Nolu Sokak.No:9, Selcuklu/KONYA/TURKEY / Responsible: Metav Werkzeuge GmbH; Parkring 45; 46446 Emmerich; Germany; +49 2822 7131930; info@metav-werkzeuge.com