Precision Twist Drill 6000684 Jobber Drill 3.50mm Cobalt

Product Description

The PRECISION TWIST DRILL 6000684 is a cobalt high-speed steel jobber-length drill bit sized at 3.50 mm (0.1378 inches) with a 135-degree split point angle. It is web-thinned for improved center penetration and reduced thrust on entry. The bit carries an oxide/bronze straw coating that provides lubricity and mild heat resistance during drilling operations. Overall length is 2.75 inches with a 1.53-inch flute length. Two right-hand spiral flutes evacuate chips efficiently during through-hole and blind-hole work. This bit is installed by machinists, maintenance technicians, pipefitters, and general fabricators using standard drill presses, CNC machining centers, or hand-held power drills.

The 6000684 is intended for general-purpose drilling in steel and other metallic workpiece materials, including ferrous and non-ferrous alloys. Its cobalt-grade construction and heavy-duty grading make it appropriate for production environments and job-site metalwork where mild-to-moderate hardness materials are common. The DIN 338 specification governs its dimensional standards, and the bit meets ANSI requirements. The straight cylindrical shank fits standard three-jaw drill chucks without adapters, making it straightforward to deploy in both benchtop and portable setups.

Key Features

• 3.50 mm (0.1378 inches) diameter cobalt HSS construction for improved heat and wear resistance over standard HSS
• 135-degree split point reduces walking and lowers entry thrust on hard materials
• Web-thinned tapered web configuration improves chip clearance and cutting efficiency
• Oxide/bronze straw coating provides lubricity and moderate corrosion resistance
• DIN 338 and ANSI compliant dimensions ensure interchangeability with standard tooling
• Right-hand regular spiral flutes with 11xD flute-to-diameter ratio for deep-hole chip evacuation

Compatibility

Designed as a general-purpose jobber drill for use in standard three-jaw drill chucks accepting straight cylindrical shanks at 3.50 mm (0.1378 inches) shank diameter, compatible with drill presses, CNC machining centers, and handheld power drills across production and maintenance applications.

Installation Notes

A licensed machinist or qualified maintenance technician should secure the straight shank fully in a properly sized drill chuck before operation. Ensure the drilling machine is powered down and locked out before changing or inspecting bits. Use appropriate cutting fluid or coolant on the workpiece when drilling steel to extend bit life, noting that this bit does not support through-coolant delivery. Inspect the cutting edges and web-thinned point for wear before each use in production applications.