Guhring 9005520090900 Drill Bit 0.3579 in Hss Series 552

Product Description

The GUHRING 9005520090900 is a stub-length, screw machine drill bit designed for high-performance drilling in aluminum and similar non-ferrous workpiece materials. Built to DIN 1897 standards from high speed steel with a bright, uncoated finish, this bit features a parabolic flute geometry and a web-thinned, parallel web configuration that reduces cutting resistance and improves chip evacuation. The 130-degree split point provides accurate starting without a center punch in most setups. At 0.3579 inches in diameter — letter size T — it suits production environments where consistent, repeatable hole sizing is required. This is a professional-grade tool intended for machinists and tool-room technicians.

The 9005520090900 fits standard drill chucks that accept a straight-cylindrical shank. Its stub overall length of 3-5/16 inches and 1-9/16 inch flute length make it suited for close-quarters or gang-plate drilling operations where a jobber-length bit would introduce too much deflection. Maximum drilling depth is 1.0380 inches, and the 3xD flute-to-diameter ratio supports efficient chip clearing at that depth. It is appropriate for CNC machining centers, manual drill presses, and hand-held pneumatic or electric drills used in production or maintenance applications.

Key Features

• Parabolic flute geometry with web thinning improves chip flow and reduces thrust force
• 130-degree drill point angle for self-centering entry, particularly effective in aluminum
• Bright, uncoated high speed steel construction suitable for non-ferrous and general-purpose drilling
• Stub length reduces deflection in short-reach and gang-drilling setups
• DIN 1897 specification ensures dimensional conformance for production tooling
• Diameter tolerance of plus 0.000 to minus 0.022 mm supports close-tolerance hole requirements

Compatibility

Designed as a DIN 1897 screw machine length drill bit in GUHRING Series 552, suitable for straight-shank drill chucks in CNC machining centers, drill presses, and handheld power tools where a stub-length, letter-size T bit is specified. Primary workpiece material is aluminum; the uncoated HSS construction also suits other non-ferrous and softer materials.

Installation Notes

Installation and use of this drill bit should be performed by a qualified machinist or tooling technician. Secure the straight-cylindrical shank fully into the chuck and verify runout before cutting. Follow the machine manufacturer's recommended speeds and feeds for HSS tooling in the workpiece material. Inspect the cutting edges for wear or chipping before each use and replace when the bit no longer holds tolerance.