Precision Twist Drill 5995876 Letter Z Hss Jobber Drill

Product Description

The PRECISION TWIST DRILL 5995876 is a Letter Z jobber-length drill bit designed for general-purpose and heavy-duty drilling in demanding materials. Built from M2 high-speed steel with a bronze (straw) coating, it features a 135-degree split-point tip with web thinning for reduced thrust and faster starts without a center punch. The straight shank measures 0.4130 inches in diameter and seats in standard drill chucks. With an overall length of 5.25 inches and a flute length of 3.875 inches, this bit handles drilling depths up to 3.875 inches. A right-hand, regular spiral flute pattern evacuates chips efficiently during operation.

This drill bit is rated for use in high-temperature alloys and general metalworking applications. The Series HX10-HX15-HX18 designation covers a range of heavy-duty cutting scenarios found in aerospace, tool-and-die, and industrial maintenance environments. It follows ANSI standards and carries a 9xD flute-to-diameter ratio, making it a practical choice for machinists, maintenance mechanics, and fabricators working with ferrous and non-ferrous metals as well as high-temp alloys.

Key Features

• Letter Z size — 0.4130 inch decimal equivalent for precise hole sizing
• 135-degree split point with web thinning reduces walking and cutting force
• M2 high-speed steel construction for hardness and wear resistance at elevated cutting temperatures
• Bronze (straw) coating provides lubricity and mild heat resistance
• Right-hand, regular spiral flute promotes efficient chip evacuation
• Straight cylindrical shank fits standard 3-jaw and keyless drill chucks

Compatibility

Designed as a general-purpose jobber drill bit in the HX10-HX15-HX18 series, suitable for use in standard drill presses, milling machines, and handheld power drills with compatible chuck capacity for a 0.4130-inch shank.

Installation Notes

Installation and use of this drill bit should be performed by qualified machinists or maintenance professionals familiar with proper speeds and feeds for HSS tooling. Secure the straight shank firmly in the chuck before operation and verify the workpiece is clamped or fixtured to prevent movement. Apply appropriate cutting fluid when drilling high-temp alloys or hard steels to extend tool life. Inspect the cutting edges before each use and replace the bit if chipping or excessive wear is observed.