40mm Corner Turning Head 90° For R390-1704 Indexable Inserts, 4 Cutting Edges, M3.5x8.5 Torx Screw - Teknik Makina

Take advantage of a compact, 90° turning solution that pairs precision with quick insert changes; the combination of a 16 mm shank, Ø 40 mm head and compatibility with R390-1704 indexable inserts ensures stable shoulder turning and efficient tool management — order via Metav Werkzeuge or consult their specialists for technical integration.

Corner tool head T402TM — 90° indexable insert holder for R390-1704 (Teknik Makina)

The Corner tool head T402TM is a 90° turning holder designed for use with R390-1704 indexable inserts, intended for precise shoulder and finishing operations on lathes and turning centres.

• 90° cutting head for accurate shoulder turning
• Compatible with Sandvik R390-1704 inserts
• 16 mm shank diameter, Ø 40 mm head
• Torx M3.5x8.5 screw, T15 key required

Accurate 90° geometry for repeatable shoulder turning

A true benefit of a 90° cutting angle is predictable tool engagement when machining shoulders or form features. The holder’s geometry secures the insert at a right angle to the workpiece, reducing deflection and making precision turning more consistent across batches. Support for R390-1704 inserts combines widely available insert grades with a holder designed to keep cutting insert position stable, which reduces rework and increases first-pass yield in production.

Compact mounting that improves stability and changeover times

The compact design — 16 mm shank, Ø 40 mm head and 45 mm overall length — keeps the centre of mass close to the lathe spindle, improving rigidity without excessive overhang. The light weight (0.276 kg) lowers inertia for faster tool indexing and less vibration during short-cycle operations. Insert retention uses a Torx M3.5x8.5 screw and T15 key, providing secure clamping torque and straightforward insert changes; the arrangement supports maintenance-friendly workflows and predictable tightening levels for repeatable setup.

Workshop advantages: compatibility, stock efficiency and durability

Compatibility with Sandvik type R390-1704 inserts means the holder integrates with commonly stocked grades, simplifying procurement and reducing the number of toolholders required for multi-material work. The holder features 4 cutting edges (indexable inserts), extending effective tool life before replacement is needed and lowering unit tooling cost over time. Robust construction and straightforward fixing details make the head a durable, low-maintenance choice for machine shops seeking reliable, high-uptime turning solutions.

For tailored advice on integrating the T402TM into existing setups or to confirm current stock, contact Metav Werkzeuge in Emmerich: info@metav-werkzeuge.com or +49 2822 7131930

Technical data

• Article number: T402TM
• Manufacturer: Teknik Makina
• Product: Corner tool head for R390-1704 indexable inserts

Dimensions & weight

• Head diameter: 40 mm
• Shank diameter (d): 16 mm
• Overall length: 45 mm
• Weight: 0.276 kg
• Cutting angle: 90°

Features & compatibility

• Compatible inserts: R390-1704
• Compatible insert manufacturer: Sandvik
• Torx screw: M3.5x8.5
• Torx key: T15
• Number of cutting edges: 4

FAQ

Which inserts fit this holder?
The corner tool head T402TM accepts R390-1704 indexable inserts; compatibility is specified for Sandvik-style inserts and similar ISO-compatible grades.

How is the insert secured in the holder?
Insert clamping is provided by a Torx M3.5x8.5 screw tightened with a T15 key, offering consistent clamping force and easy insert replacement.

What shank diameter is required for mounting?
The holder uses a 16 mm shank diameter for the tool post or turret seat; this compact shank aids rigidity while keeping overhang low.

Is the head suitable for precision shoulder turning?
Yes — the 90° cutting geometry and stable head design make the T402TM appropriate for accurate shoulder and finishing turning operations on production lathes.

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