Sumitomo U101045 Screw Machine Drill Bit 0.191 in Carbide

Product Description

The SUMITOMO U101045 is a solid carbide screw machine length drill bit designed for precision drilling in ferrous materials. It measures 0.191 inches (4.85 mm) in diameter with an overall length of 2.5591 inches and a flute length of 0.9843 inches. The 135-degree split point reduces walking and cutting force at entry. The straight-cylindrical shank seats cleanly in standard drill chucks and collet holders. This bit carries a coated finish to improve wear resistance and heat dissipation during high-cycle operations. It is sized within the MDW-GS series range and suited for machinists and tool-room technicians running screw machine operations on cast iron and steel workpieces.

The U101045 is built for screw machine and short-hole drilling applications on cast iron and steel. The 2xD flute-by-diameter ratio and tapered web geometry support chip evacuation in shallow to moderate depth holes up to 0.6978 inches. Typical install environments include CNC machining centers, turret lathes, and manual drill presses where consistent hole quality and tool life in ferrous stock are priorities. The h8 diameter tolerance ensures dimensional accuracy for close-tolerance bore applications.

Key Features

• Solid carbide construction provides rigidity and wear resistance in cast iron and steel
• 135-degree drill point angle reduces entry deflection and cutting force
• Coated finish extends tool life in high-cycle and abrasive material conditions
• Tapered web configuration promotes chip flow and reduces heat buildup
• h8 diameter tolerance supports close-tolerance and precision bore work
• Straight-cylindrical shank compatible with standard collets and drill chucks

Compatibility

Designed for use in standard straight-shank collet holders and drill chucks accepting a 0.191-inch diameter bit; primary workpiece materials are cast iron and steel as specified by the MDW-GS series designation.

Installation Notes

Installation and tool changes should be performed by a qualified machinist with the machine fully de-energized and spindle at rest. Verify collet or chuck runout before seating the bit to maintain h8 tolerance at the bore. Do not exceed the recommended maximum drilling depth of 0.6978 inches without withdrawing to clear chips. Coolant-through is not supported on this bit; apply external coolant or cutting fluid as appropriate to the workpiece material and feed rate.