54mm S45V CKUNR Boring Bar 60mm Cutting Height, 400mm Overall Length - Teknik Makina

Take advantage of the combination of a 45 mm shank for secure clamping, a 400 mm overall length for extended reach and compatibility with KNUX 1604 inserts for efficient indexable tooling — order the RK758TM directly via Metav Werkzeuge or consult our advisors for specification support

RK758TM Boring bar – CKUNR for KNUX indexable inserts, 45 mm shank by Teknik Cutting Tools

A RK758TM boring bar designed for right-hand turning and extended-reach internal and external machining with KNUX 1604 indexable inserts.

• Robust 45 mm shank for stable clamping
• Compatible with KNUX 1604 indexable inserts
• 400 mm overall length for extended reach

Stable clamping for reliable heavy machining

The RK758TM is built around a 45 mm shank, which provides the rigidity required for repeatable results in demanding setups. A larger shank diameter reduces vibration and run-out, translating into improved surface finish and longer insert life. The 54 mm diameter at the cutting end and the 93° cutting angle support effective chip formation during right-hand cutting, making this bar suitable where stability and predictable cutting behaviour are priorities. The substantial mass of 4.924 kg further dampens chatter in many turning operations, reducing secondary finishing steps.

Extended reach with predictable geometry

With an overall length of 400 mm, the RK758TM offers reach for deeper bores and larger workpieces while maintaining stability through its robust design. The 60 mm cutting height gives sufficient support for indexable inserts to engage material cleanly and consistently. Clear, measurable geometry makes process planning straightforward: feeds and speeds can be set knowing the toolholder geometry and mass will behave consistently, which supports higher first-pass yield and reduced cycle time in production environments.

Insert system and handling designed for productivity

The ISO designation S45V CKUNR indicates a CKUNR-style holder compatible with KNUX 1604 indexable inserts, a common and readily available insert format in industry. Compatibility with standard inserts simplifies tool inventory and changeover. The right-hand cutting configuration allows integration into established lathe programmes without modification. Tool changes are simplified by the indexable system, reducing downtime compared with brazed or one-piece tooling and supporting a leaner workshop workflow.

Proven choice for workshops and production lines

Specifying tooling from an experienced supplier reduces procurement risk: this holder’s defined dimensions and standard insert compatibility support predictable purchasing and stocking. The combination of robust shank diameter, defined cutting geometry and standardised insert format makes the holder an economical choice for mixed-batch production or workshop environments that require versatility and repeatability. Metav’s position as a precision partner ensures reliable supply and technical guidance from its Emmerich facility.

For machining tasks that require extended reach and secure clamping, contact Metav Werkzeuge to source the Teknik Cutting Tools RK758TM boring bar or discuss process integration via info@metav-werkzeuge.com or +49 2822 7131930

Technical data

• Article number: RK758TM
• Description: CKUNR for KNUX Indexable Inserts
• ISO designation: S45V CKUNR
• Manufacturer: Teknik Makina

Facts

• Shank diameter: 45 mm
• Cutting height: 60 mm
• Diameter: 54 mm
• Overall length: 400 mm
• Weight: 4.924 kg
• Cutting angle: 93°
• Cutting direction: Right-hand
• eClass: 21180806

Special features

• Suitable for KNUX 1604 indexable inserts
• CKUNR-style holder
• Designed for indexable-insert changeover
• Robust construction for reduced vibration

FAQ

What insert type fits this holder?
The RK758TM accepts KNUX 1604 indexable inserts in a CKUNR holder configuration, enabling use of widely available insert grades

Is this tool suitable for right-hand cutting only?
Yes, the holder is configured for right-hand cutting and is optimised for typical turning and boring operations in that direction

What are the key dimensions to consider for setup?
Relevant dimensions include a 45 mm shank, 54 mm diameter, 60 mm cutting height and 400 mm overall length for fixture planning

How does the shank diameter affect performance?
A 45 mm shank increases rigidity and reduces vibration, which improves surface finish and extends insert life under comparable cutting conditions

Can this holder be used in small workshop lathes?
The RK758TM’s mass and reach are intended for stable setups; assessment of machine capacity and tooling clearance is recommended before selection

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