Sumitomo U103677 Taper Length Drill Bit 1/8 in Carbide

Product Description

The SUMITOMO U103677 is a taper length drill bit engineered for precision drilling in demanding industrial and machining applications. Built from solid carbide with a DEX coating, this bit delivers consistent performance in hard or abrasive materials where high-speed steel tooling falls short. The 135-degree split point reduces walking and allows drilling without a center punch. At 1/8 inch (0.1250 inches) diameter with a J-Flute geometry and coolant-through capability, it is designed for high-efficiency chip evacuation and thermal management during deep-hole drilling operations. Machinists and CNC operators working in production environments are the primary users.

This drill bit is suited for taper-length drilling cycles in metalworking, aerospace, and precision manufacturing environments. The MDW-HGS series targets applications requiring an 8xD flute-to-diameter ratio, making it appropriate for moderately deep holes where chip clearance and rigidity are both critical. The straight cylindrical shank fits standard drill chucks and collet holders without modification. Coolant-through design supports both flood and through-spindle coolant delivery, extending tool life in ferrous and non-ferrous materials.

Key Features

• Solid carbide construction with DEX coating for hardness and wear resistance
• 135-degree point angle reduces entry force and minimizes workpiece walking
• J-Flute geometry promotes efficient chip evacuation in deep-hole drilling
• Coolant-through design supports through-spindle coolant for thermal control
• 8xD flute length ratio balances reach and rigidity at 1.2992 inches flute length
• Tapered web configuration adds strength at the core without sacrificing cutting performance

Compatibility

Designed as an OEM-style replacement and standard tooling option for CNC machining centers and drill presses accepting a 0.1250-inch straight cylindrical shank in the MDW-HGS series configuration.

Installation Notes

Installation should be performed by a qualified machinist following standard toolholding procedures. Ensure the spindle is fully stopped and the machine is in a safe, locked-out state before inserting or removing the bit from the collet or chuck. Verify runout with a dial indicator before production drilling to protect both the tool and workpiece. Consult the machine tool manufacturer and applicable OSHA machining safety standards for speed, feed, and coolant setup guidance.