Sumitomo 5VHY121 Screw Machine Drill Bit 0.5709 in Carbide

Product Description

The SUMITOMO 5VHY121 is a screw machine length drill bit designed for high-performance drilling in demanding metalworking applications. Built from solid carbide with a coated finish, it features a 135-degree drill point angle and a straight-cylindrical shank for secure chuck engagement. The bit measures 0.5709 inches (14.50 mm) in diameter with an overall length of 5.5118 inches and a flute length of 2.8543 inches. Coolant-through design supports internal coolant delivery to extend tool life and improve chip evacuation during deep-hole operations. This tool is intended for use by machinists and tool-and-die professionals in production and job-shop environments.

The 5VHY121 is suited for drilling cast iron, stainless steel, and steel in applications where consistent hole geometry and tight tolerances are required. The screw machine length (stub) profile provides added rigidity compared to jobber-length bits, making it well-suited for CNC machining centers, drill presses, and turret lathes where setup stability is critical. The MDW-HGS series is engineered for high-speed, high-feed drilling cycles in production environments handling ferrous materials.

Key Features

• Solid carbide construction for rigidity and wear resistance in ferrous materials
• 135-degree drill point angle reduces entry force and minimizes workpiece walking
• Coolant-through capability delivers coolant directly to the cutting edge for thermal management
• Screw machine length profile provides greater rigidity than jobber-length bits
• Tapered web configuration for improved strength and chip flow
• h8 diameter tolerance ensures consistent fit in precision tool holders

Compatibility

Designed for use in CNC machining centers and conventional machine tools equipped with straight-shank toolholders. Primary workpiece materials are cast iron, stainless steel, and steel. Part of the SUMITOMO MDW-HGS series. Drill bit size range covered by this series is 0.5000 to 0.6000 inches (13.50 to 17.00 mm).

Installation Notes

Installation should be performed by a qualified machinist or tooling technician familiar with carbide cutting tools. Ensure the machine spindle and toolholder are clean and free of debris before seating the shank. Carbide is brittle - avoid side-loading or impact during installation and do not use toolholders that cannot maintain secure grip on a 15.00 mm straight-cylindrical shank. Verify coolant-through connections are properly engaged before running the tool at speed.