Guhring 9003050063500 Cobalt Jobber Drill Bit Letter E

Product Description

The GUHRING 9003050063500 is a cobalt jobber-length drill bit sized at Letter E (0.250 inch decimal) with a 118-degree standard point angle. Finished with an oxide coating for added wear resistance, it is built to DIN 338 specification and carries a web-thinned, tapered web configuration that reduces thrust during entry. The straight-cylindrical shank measures 0.250 inch in diameter and seats securely in standard drill chucks. With a 2-flute right-hand spiral flute design and a general-purpose tool performance rating, this bit is suited for machinists, maintenance technicians, and fabricators working with ferrous and cast iron materials.

This drill bit is designed for general-purpose drilling in cast iron and steel in both production and maintenance environments. The Series 305 designation places it in a jobber-length family intended for through-hole and blind-hole work where a standard flute-to-diameter ratio is appropriate. It is a single-piece, individually packaged bit commonly used in manual drill presses, CNC machines, and hand-held power drills where a 1/4-inch straight-shank tool is required.

Key Features

• Cobalt construction with oxide coating for improved heat and wear resistance
• 118-degree standard point angle suitable for general-purpose ferrous drilling
• Web-thinned tapered web reduces drill thrust and improves chip clearance
• Right-hand cut, 2-flute spiral design for efficient chip evacuation
• DIN 338 specification ensures dimensional consistency
• Straight-cylindrical shank fits standard chucks without adapters

Compatibility

Designed as a general-purpose jobber-length drill bit compatible with any drill press, machining center, or hand-held drill accepting a 0.250-inch straight-cylindrical shank. Rated for primary workpiece materials cast iron and steel per material codes K and P.

Installation Notes

Installation and use should be performed by qualified machinists or maintenance technicians familiar with drill press and machining safety practices. Secure the shank fully in the chuck and verify concentricity before drilling. Disconnect power to the machine before changing bits or adjusting workpiece fixturing. Operator should select appropriate feed rate and cutting speed for the workpiece material to avoid premature bit wear or breakage.