Sumitomo U101112 Drill Bit 5/16 in 135 Deg Solid Carbide

Product Description

The SUMITOMO U101112 is a screw machine length drill bit designed for high-performance drilling in demanding metalworking applications. Built from solid carbide, it features a 135-degree split point, a 5/16 inch diameter, and a straight-cylindrical shank measuring 0.3125 inches in diameter. The overall length is 3.7008 inches, with a flute length of 1.5748 inches. Coolant-through capability makes this bit well-suited for sustained high-speed operations where heat management is critical. It belongs to the MDW-HGS series and carries a tapered web configuration for improved chip evacuation and point strength. Licensed machinists and CNC operators are the primary users of this bit in production environments.

This drill bit is intended for use on cast iron, stainless steel, and carbon steel workpieces. Its screw machine length profile makes it a practical choice for drilling operations on lathes, drill presses, and CNC machining centers where stub-length rigidity is needed. The 3xD flute-to-diameter ratio and two-margin design support accurate hole entry and consistent hole quality across production runs. It is a single-piece, individually packaged bit suited for precision replacement or tooling stock in machine shops and manufacturing facilities.

Key Features

• Solid carbide construction for high wear resistance and rigidity in ferrous materials
• 135-degree split point for fast engagement and reduced walking on hard surfaces
• Coolant-through design for effective heat and chip management at depth
• Straight-cylindrical shank at 0.3125 inches diameter for standard chuck compatibility
• Tapered web configuration improves chip flow and point stability
• Two-margin geometry supports tight hole tolerances with h8 diameter tolerance class

Compatibility

Designed as an OEM-style replacement or production tooling option for machining setups requiring a screw machine length drill bit with a 5/16 inch diameter and straight-cylindrical shank. Compatible with cast iron, stainless steel, and steel workpieces per MDW-HGS series specifications.

Installation Notes

Installation is performed by machinists or CNC operators. Secure the shank fully in the drill chuck or collet before operation, and confirm coolant lines are connected and flowing before engaging the cut. Inspect the cutting edge for chips or wear before each use, as carbide tooling can fracture if run on damaged edges. Follow applicable machine shop safety protocols and the equipment manufacturer's speed-and-feed guidelines for solid carbide tooling in ferrous materials.