Precision Twist Drill 5999671 Cobalt Jobber Drill 1.70mm

Product Description

The PRECISION TWIST DRILL 5999671 is a cobalt high-speed steel jobber-length drill bit designed for general-purpose drilling in steel, cast iron, aluminum, non-ferrous metals, and high-temperature alloys. It measures 1.70 mm in diameter with an overall length of 1.6875 inches and a 135-degree split point that reduces walking on contact and lowers thrust force at entry. The straw oxide finish provides light lubricity and heat resistance during operation. With a straight cylindrical shank and two regular-spiral flutes, this bit fits standard drill chucks and collets across a wide range of benchtop and handheld drilling equipment used by machinists and maintenance tradespeople.

This bit is suited for production and maintenance drilling applications where a small-diameter hole is required in ferrous and non-ferrous materials. The 12xD flute-to-diameter ratio supports consistent chip evacuation in jobber-depth holes. It carries DIN 338 and ANSI standards, making it appropriate for shops that specify dimensionally standardized tooling. Primary workpiece material codes P, M, K, N, and S indicate suitability across steel, stainless, cast iron, non-ferrous, and superalloy materials. It is sold individually but requires a minimum order of 12 units.

Key Features

• Cobalt HSS construction for improved heat resistance and hardness retention in steel and alloy drilling
• 135-degree split point reduces entry walking and lowers feed force compared to conventional 118-degree points
• Straw oxide coating provides light lubrication and corrosion resistance during use
• Web-thinned, tapered web design reduces cutting resistance and improves chip flow
• DIN 338 and ANSI compliant dimensioning for interchangeability with standard toolholders
• Right-hand cutting, regular-spiral flute geometry suited for general-purpose production drilling

Compatibility

Designed as a standard jobber-length drill bit per DIN 338 and ANSI specifications, compatible with any drill chuck or collet system accepting a 1.70 mm straight cylindrical shank. Suitable for drilling workpiece material codes P (steel), M (stainless steel), K (cast iron), N (non-ferrous), and S (superalloys).

Installation Notes

Installation and use should be performed by a qualified machinist or maintenance technician familiar with small-diameter tooling. Secure the shank fully in the chuck or collet before operation and verify runout is within acceptable limits for the application. Disconnect and lock out all power to the drilling equipment before changing bits. Do not exceed the rated speed for the workpiece material and bit diameter, and use cutting fluid where required by the workpiece material to extend tool life.