Precision Twist Drill 5999639 Jobber Drill 1.35 Mm

Product Description

The PRECISION TWIST DRILL 5999639 is a cobalt-steel jobber-length drill bit designed for general-purpose drilling in metal and other demanding workpiece materials. It measures 1.35 mm (0.0531 inches) in diameter with an overall length of 1-37/64 inches (1.5781 inches) and a flute length of 45/64 inches (0.7031 inches). The 135-degree split point reduces walking on contact and requires no center punch on most surfaces. A straw oxide finish provides light lubrication and surface protection during cutting. The straight cylindrical shank seats in standard drill chucks without modification.

This bit is suited for drilling steel, cast iron, non-ferrous metals, and similar materials in production or maintenance environments. It carries a DIN 338 specification and meets ANSI standards, making it appropriate for machine shop, fabrication, and industrial maintenance applications. The two-flute regular spiral configuration promotes efficient chip evacuation in through-hole and blind-hole drilling. The web-thinned, tapered web geometry reduces thrust force in harder materials. Maximum drilling depth is 0.7087 inches.

Key Features

• Cobalt construction rated for heavy-duty service in steel and hard alloys
• 135-degree standard point with web thinning reduces entry thrust and eliminates the need for a center punch on flat stock
• Straw oxide finish provides surface protection and light lubricity during drilling operations
• Two-flute regular spiral design promotes clean chip evacuation
• Straight cylindrical shank fits standard drill chucks and collets
• DIN 338 specification with ANSI compliance for consistent dimensional tolerancing

Compatibility

Designed as a general-purpose replacement or stock jobber drill for use in any standard drill press, CNC machining center, or hand drill accepting a 1.35 mm straight-shank bit. Compatible with primary workpiece material codes P, M, K, N, and S per ISO material classification.

Installation Notes

Machinist or maintenance technician installation. Secure the shank fully in the chuck and confirm runout before drilling. Power down and lock out the machine before changing bits. Follow applicable ANSI and shop-floor safety standards for rotating cutting tools, including the use of appropriate cutting fluid on steel workpieces to extend bit life.