Guhring 9038990011900 Micro Drill Bit 3/64 in Carbide

Product Description

The GUHRING 9038990011900 is a solid carbide micro drill bit engineered for precision drilling in demanding industrial and machining applications. It features a 140-degree faceted point with web thinning for accurate centering and reduced thrust force at entry. The TiAlN coating improves heat resistance and extends tool life when drilling at elevated speeds. At 1.19 mm (3/64 inch) diameter with a straight-cylindrical shank and spiral flute geometry, this bit is sized for small-diameter, high-precision bore work. A licensed machinist or tooling technician installs and uses this bit in CNC machining centers, drill presses, or precision hand-held equipment.

This micro drill bit is designed for use in cast iron and steel workpieces, making it suitable for production machining, toolroom work, and precision fabrication environments. The 5xD flute-to-diameter ratio and 10 mm flute length provide chip evacuation in shallow-to-moderate depth holes. Maximum drilling depth is 8.22 mm (0.324 inches). The Series 3899 design targets right-hand spiral cutting in ferrous materials where tight tolerances and consistent hole quality are required.

Key Features

• Solid carbide construction in Material Grade K40 for rigidity and wear resistance in ferrous materials
• TiAlN coating for elevated heat resistance and extended tool life at high cutting speeds
• 140-degree faceted point with web thinning for self-centering entry and reduced thrust
• Straight-cylindrical shank with h7 diameter tolerance for consistent chuck fit and runout control
• Right-hand spiral flute with 5xD ratio for effective chip evacuation in cast iron and steel
• Overall length of 38 mm for use in standard micro-drill toolholders and collet chucks

Compatibility

Designed for use in CNC machining centers, drill presses, and precision rotary toolholders accepting a 3 mm straight-cylindrical shank. Rated for primary workpiece materials including cast iron (Material Code K) and steel (Material Code P).

Installation Notes

Installation and use of this drill bit should be performed by a qualified machinist or CNC tooling technician. Ensure the machine spindle is fully stopped and power is locked out before loading or removing the bit from the toolholder or collet chuck. Verify shank seating and runout before commencing drilling, as micro-diameter carbide tooling is sensitive to misalignment and side loading. Follow the machine manufacturer and cutting tool manufacturer guidelines for speed and feed parameters appropriate to the workpiece material.