Precision Twist Drill 5999625 Cobalt Jobber Drill 3/64 in

Product Description

The PRECISION TWIST DRILL 5999625 is a cobalt high-speed steel jobber-length drill bit designed for drilling into steel and other demanding workpiece materials. The 135-degree split point reduces walking at drill entry and lowers the thrust force required to start a hole without a center punch. An oxide and straw finish provides light lubricity and surface protection during dry or lightly lubricated drilling operations. With a straight cylindrical shank measuring 3/64 inch (0.0469 decimal inch) in diameter and an overall length of 1.5 inches, the bit fits standard keyless and keyed drill chucks in handheld and bench-mounted applications. It carries a two-flute regular spiral configuration with a web-thinned, tapered web for improved chip evacuation.

This jobber drill is suited for general-purpose drilling in steel, cast iron, non-ferrous metals, and similar materials as indicated by the P, M, K, N, and S workpiece material codes. Its compact 1.5-inch overall length and 5/8-inch flute length make it appropriate for close-quarter or shallow-hole applications. Electricians, HVAC technicians, plumbers, and general service trades commonly use small-diameter jobber bits like this one when installing hardware, mounting brackets, or routing components through sheet metal and structural members. The 3/64-inch diameter targets fine fastener pilot holes and precision layout work.

Key Features

• Cobalt high-speed steel construction provides elevated heat and wear resistance compared to standard M2 HSS
• 135-degree split point reduces drill walking and lowers required feed pressure at entry
• Oxide and straw coating adds surface lubricity and corrosion resistance
• Web-thinned, tapered web improves chip flow and reduces heat buildup in the flutes
• Right-hand cutting, regular spiral flute geometry for conventional drilling operations
• Meets ANSI standards and conforms to DIN 338 specification

Compatibility

Designed as a general-purpose jobber-length drill bit compatible with standard 3-jaw keyless and keyed drill chucks accepting straight cylindrical shanks. Suitable for workpiece materials including steel, stainless, cast iron, non-ferrous metals, and composites as designated by material codes P, M, K, N, and S per DIN classification.

Installation Notes

Install the shank fully and securely into the drill chuck before operation and verify the chuck key is removed before starting the spindle. When drilling steel with small-diameter bits, use appropriate cutting fluid or cutting oil to extend tool life and reduce heat. Avoid excessive feed pressure on 3/64-inch diameter bits, as the small cross-section is susceptible to breakage under lateral load. Ensure the workpiece is clamped or otherwise secured before drilling.