Sandvik Coromant 5728920 Boring Bar Holder C6 63mm

Product Description

The SANDVIK COROMANT 5728920 is a boring bar holder designed for precision internal turning and boring operations on CNC lathes and machining centers. Built around a C6 modular connection interface, this holder accepts boring bars and provides a rigid, concentric mount that resists deflection during deep-bore cuts. The 63 mm bore diameter and 89.99 mm bore depth accommodate a range of boring bar shanks used in production and job-shop environments. Internal coolant delivery channels coolant directly to the cutting zone, improving chip evacuation and extending tool life in ferrous and non-ferrous materials. Machinists and tooling technicians in metal-cutting shops are the primary users.

This boring bar holder is suited for use on CNC turning centers and mill-turn machines equipped with a C6 modular tooling interface. It fits common turret and spindle configurations where modular quick-change tooling systems are used. The 63 mm body diameter and 89.99 mm body length make it appropriate for medium-to-large bore applications in both production and prototype environments. The no-head style body allows direct bar clamping using the 3.67 mm lock screw, which is compatible with SANDVIK 5512 063-09 lock screws.

Key Features

• C6 modular connection for quick, repeatable tooling changes on compatible turrets
• 63 mm bore diameter accepts standard boring bar shanks of matching size
• 89.99 mm bore depth provides secure engagement for stable, low-vibration cutting
• Internal coolant delivery routes fluid directly to the cutting edge for improved chip control and tool life
• No-head body style with 3.67 mm lock screw clamping for compact, streamlined setup
• Compatible lock screw: 5512 063-09

Compatibility

Designed for use with C6 modular tooling interfaces. Compatible lock screw size is 5512 063-09. Verify turret interface and bore bar shank diameter before installation.

Installation Notes

Installation should be performed by a qualified machinist or tooling technician familiar with CNC turret tooling systems. Power down and lock out the machine before mounting or removing the holder from the turret. Ensure the C6 interface and mating surfaces are clean and free of chips or burrs before seating the holder. Torque the lock screw to the machine or tooling system manufacturer's specification using the correct hex key for the 3.67 mm screw size.