Hertel 74130956 Cobalt Screw Machine Drill Bit Size 43

Product Description

The HERTEL 74130956 is a cobalt screw machine length drill bit designed for high-speed, precision drilling in tough materials. Built to the Series HSCO135 standard, it features a 135-degree split point that reduces walking and requires no center punch on most work surfaces. The bit measures 1.75 inches overall with a 0.75-inch flute length and a wire gauge diameter of Number 43, equal to 0.0890 inches. Right-hand cut with a regular spiral flute and straight cylindrical shank, this bit suits production drilling environments where short, rigid tooling reduces deflection and improves hole accuracy. Machinists, tool-and-die techs, and metalworking pros reach for this bit when drilling hard alloys, stainless, and heat-treated steels.

This drill bit is sized for Number 43 wire gauge applications, covering decimal inch sizes in the 0.0000 to 0.1000 inch range. The screw machine length body keeps the tool short and stiff, making it well-suited for drill press, CNC turret, and manual lathe work where tool overhang must be minimized. The web-thinned, parallel web configuration reduces thrust and keeps cutting action clean even in interrupted cuts or cross-hole entry. It is sold individually and requires a minimum order of 12 units.

Key Features

• Cobalt construction for drilling hard metals including stainless steel and heat-treated alloys
• 135-degree split point reduces drill walk and lowers entry thrust without center punching
• Web-thinned parallel web design reduces axial cutting load and extends tool life
• Screw machine length body (1.75 inches OAL) provides rigidity and minimizes deflection
• Regular spiral flute with right-hand cut for standard metalworking applications
• Straight cylindrical shank fits standard drill chucks and collets without modification

Compatibility

Designed as an OEM-style replacement or direct-use cobalt drill bit for any standard drill press, CNC turret, or hand drill chuck accepting a straight-shank bit at Number 43 wire gauge (0.0890 inches) diameter.

Installation Notes

Installation and use of this drill bit should be performed by qualified machinists or metalworking technicians familiar with cutting speed and feed rate selection for cobalt tooling. Secure the straight shank fully in the chuck before operation, and verify chuck runout is within acceptable limits to prevent premature wear. Always use appropriate cutting fluid or coolant when drilling hard or stainless alloys, even though this bit does not support through-coolant delivery. Inspect the cutting edges before each use and remove from service if chipping or deformation is observed.