Sandvik Coromant 5747211 Solid Carbide Jobber Drill Bit 8mm

Product Description

The SANDVIK COROMANT 5747211 is a solid carbide jobber length drill bit engineered for high-performance drilling in demanding materials. It measures 8 mm (0.315 inches) in diameter with a 140-degree self-centering point angle and a TiAlN coating that extends tool life in high-heat applications. Overall length is 91 mm (3.583 inches), with a flute length of 53 mm (2.087 inches) and a maximum drilling depth of 41.40 mm (1.630 inches). The straight-cylindrical shank matches the 8 mm bit diameter, and the regular spiral flute with right-hand cut geometry promotes clean chip evacuation. Coolant-through capability makes this bit well suited to deep-hole operations in production environments. It carries a micrograin carbide grade for edge stability at elevated cutting speeds.

This drill bit is designed for machining steel, stainless steel, cast iron, non-ferrous metals, and superalloys including titanium, corresponding to ISO material groups P, M, K, N, and S. It belongs to the Sandvik Coromant R840 series, a line targeted at high-productivity CNC drilling operations in aerospace, automotive, and general metalworking. The 7xD flute-to-diameter ratio supports controlled chip removal in through-hole and blind-hole applications. It is used in machining centers and CNC lathes equipped with coolant-through spindles, and it conforms to DIN 6535HA shank specifications for consistent tool holding in standard collet and hydraulic chuck systems.

Key Features

• Solid micrograin carbide construction for rigidity and edge retention at high cutting speeds
• TiAlN coating provides heat and oxidation resistance in dry and minimum-quantity lubrication (MQL) cutting
• 140-degree self-centering point angle reduces walking and improves hole entry accuracy
• Coolant-through design delivers coolant directly to the cutting edge for deep-hole drilling
• DIN 6535HA straight-cylindrical shank ensures compatibility with standard collet chucks and hydraulic tool holders
• Right-hand spiral flute with regular helix promotes efficient chip evacuation in ISO P, M, K, N, and S material groups

Compatibility

Designed for use in CNC machining centers and drilling machines with coolant-through spindle capability. Shank conforms to DIN 6535HA and fits standard 8 mm collet chucks and hydraulic holders. Suitable for drilling steel, stainless steel, cast iron, non-ferrous metals, and superalloys and titanium (ISO material groups P, M, K, N, S). Part of the Sandvik Coromant R840 series.

Installation Notes

Installation and tool changes should be performed by a qualified machinist with the machine fully stopped and the spindle locked out per applicable machine guarding procedures. Verify that the tool holder bore and collet are clean and free of chips before seating the shank. Confirm coolant-through passages are clear and that spindle coolant pressure is set according to the machine tool builder's specifications before beginning a cutting cycle. Never exceed the recommended axial depth of cut for the diameter and material combination being machined.