29mm Drill Bar STI for IR/ER Indexable Inserts 25mm Shank 200mm Overall Length, 16 IR - Teknik Makina

Take advantage of a compact, rigid boring solution that combines compatibility with standard IR/ER inserts and straightforward maintenance for uninterrupted workshop operation; the design delivers reliable clamping for 16 IR inserts and convenient integration into existing toolholders from Metav Werkzeuge.

S25R STIR boring bar — STI for IR/ER indexable inserts, 25 mm shank

S25R STIR boring bar as a right-hand cutting tool for precision internal turning and boring with IR/ER indexable inserts

• Right-hand cutting for conventional spindle setups
• 25 mm shank for rigid clamping and reduced vibration
• Compatible with 16 IR indexable inserts
• 200 mm overall length for mid-reach operations

Stable cutting and consistent bore quality

The S25R STIR is engineered to provide rigidity and dimensional consistency in internal turning operations. With a 25 mm shank and a 29 mm body diameter, the bar reduces deflection under cutting loads and helps maintain concentricity. The 40 mm cutting height gives sufficient clearance for indexed insert seating while keeping the tool profile compact. These dimensional choices translate directly into repeatable bore tolerances and fewer rework cycles, which supports efficiency and predictable process planning in production environments.

Fast insert changes and toolholder compatibility

Designed specifically for the STI system, the tool accepts 16 IR indexable inserts and mates with an IR16 clamping holder, enabling fast insert replacement without complex adjustments. The indexable system separates cutting geometry from the shank, so wear is managed economically: worn inserts can be changed quickly, restoring original cutting geometry and reducing downtime. The right-hand cutting orientation matches standard lathe and boring head setups, streamlining tool set-up procedures on the shop floor.

Practical dimensions for workshop fit and handling

With a 200 mm overall length and a mass of 0.762 kg, the bar is balanced for handling and installation while offering sufficient reach for many internal operations. The compact form factor eases storage and jigs mounting, and the S25R STIR ISO designation simplifies procurement and inventory labelling. The modest weight and standardised shank dimension support secure clamping in conventional boring fixtures, improving tool life through reduced micro-movement at the interface.

Reliability, maintenance and process integration

The mechanical simplicity of an indexable boring bar keeps routine maintenance straightforward: periodic inspection of insert seating, clamp torque and cutting-edge condition prevents unexpected downtime. The combination of a standardised IR16 clamping interface and a recognised ISO tool code aids in process documentation and changeover control. For operations seeking predictable throughput and a low-administration tooling strategy, this configuration supports leaner tool management and reproducible machining results.

For precision internal turning with proven compatibility, request the Teknik Cutting Tools S25R STIR via Metav Werkzeuge — technical supply and purchasing support are available from Metav Werkzeuge at info@metav-werkzeuge.com or by phone on +49 2822 7131930.

Technical data

• SKU: K356TM
• ISO designation: S25R STIR
• Type: STI for IR/ER indexable inserts
• Manufacturer: Teknik Makina

Dimensions & weight

• Shank diameter: 25 mm
• Cutting height: 40 mm
• Body diameter: 29 mm
• Overall length: 200 mm
• Weight: 0.762 kg
• Cutting direction: right

Compatibility & features

• Compatible insert size: 16 IR
• Clamping holder reference: IR16
• Suitable for STI indexable insert system
• Right-hand cutting configuration

FAQ

What insert size does this boring bar accept?
The boring bar accepts 16 IR indexable inserts; the tool is specified for the STI system and pairs with IR16 clamping holders.

Is the bar suitable for right-hand cutting only?
Yes — the tool is configured as a right-hand cutting boring bar (ISO designation S25R STIR).

Which shank diameter and length should be expected?
The shank is 25 mm in diameter and the overall length is 200 mm, making it suitable for standard mid-reach boring tasks.

Can this tool be used with common IR16 holders?
The design is compatible with IR16 clamping holders and is intended for quick insert changes within that interface.

What is the product reference for ordering?
Order reference: SKU K356TM — Teknik Makina S25R STIR boring bar for 16 IR indexable inserts.

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; eMail: info@metav-werkzeuge.com