Sumitomo U101265 Screw Machine Drill Bit 0.5433 in Carbide

Product Description

The SUMITOMO U101265 is a screw machine length drill bit designed for high-performance hole-making in demanding ferrous materials. Built from solid carbide with a coated finish, this bit measures 0.5433 inches (13.80 mm) in diameter and delivers a 135-degree split-point geometry that reduces walking and minimizes thrust on entry. The overall length is 5.2756 inches with a flute length of 2.7559 inches, making it suited for compact drilling applications where standard length bits are too long. Coolant-through design channels cutting fluid directly to the cutting zone, supporting extended tool life at higher feed and speed rates. Licensed machinists, tool-and-die shops, and maintenance technicians working on CNC or manual machines will find this bit a direct fit for high-volume production or precision repair work.

This drill bit is engineered for use in cast iron, stainless steel, and steel workpieces. It belongs to the MDW-HGS series and is classified as screw machine length, meaning the reduced flute length provides added rigidity compared to jobber-length bits. The straight-cylindrical shank with a 14.00 mm (0.5512 inches) shank diameter seats securely in standard drill chucks and collet holders. Typical applications include production drilling on machining centers, turret lathes, and drill presses where short, rigid tooling is preferred for accuracy and hole quality.

Key Features

• Solid carbide construction for hardness and heat resistance in ferrous materials
• 135-degree drill point angle reduces entry thrust and minimizes bit walking
• Coolant-through design delivers fluid directly to the cutting edge for chip evacuation and heat control
• Tapered web configuration adds core strength along the flute length
• Screw machine length (3xD flute-to-diameter ratio) provides rigidity for tight-tolerance drilling
• h8 diameter tolerance ensures consistent fit in precision toolholding systems

Compatibility

Designed for use on cast iron, stainless steel, and steel workpieces. Compatible with standard drill chucks and collet systems accepting a 14.00 mm straight-cylindrical shank. Part of the SUMITOMO MDW-HGS series with a drill bit size range of 0.5000 to 0.6000 inches (13.50 to 17.00 mm) within the series family.

Installation Notes

Installation and use should be performed by qualified machinists or tooling technicians familiar with CNC or manual drilling equipment. Power down and lock out the machine before loading or removing tooling. Verify shank seating and collet torque per machine manufacturer specifications before initiating a cut. Use the coolant-through feature with an appropriate cutting fluid matched to the workpiece material to maximize tool life and hole quality.