Hertel 74130543 Cobalt Screw Machine Drill Bit Size 3

Product Description

The HERTEL 74130543 is a cobalt screw machine length drill bit designed for high-performance drilling in hard and abrasive materials. Built from high-speed cobalt (HSCo) steel, this bit handles heat buildup better than standard HSS tooling, making it well-suited for stainless steel, cast iron, and other tough workpiece materials. The wire size 3 designation corresponds to a decimal diameter of 0.2130 inches. A 135-degree split point geometry reduces walking on entry and lowers thrust requirements, while the web-thinned, parallel web construction improves chip evacuation. Overall length is 2.375 inches with a 1.25-inch flute length and a straight cylindrical shank for standard chuck mounting.

Screw machine length drill bits are shorter than jobber-length bits, providing increased rigidity and reduced deflection in applications where precise hole location and finish matter. This bit is suited for machine shop production work, short-hole drilling on lathes, drill presses, CNC machining centers, and manual milling setups. Right-hand cutting direction suits standard spindle rotation. The straw finish is a heat-treatment indicator consistent with cobalt tooling and provides light oxidation resistance. Typical users include machinists, toolroom technicians, and maintenance trades working with ferrous and hard non-ferrous stock.

Key Features

• Cobalt (HSCo) construction for improved heat and wear resistance over standard HSS
• 135-degree split point reduces entry walking and lowers drilling thrust
• Web-thinned parallel web improves chip flow and reduces heat at the cutting edge
• Screw machine length body increases rigidity and minimizes deflection
• Straight cylindrical shank fits standard drill chucks and collets without modification
• Right-hand spiral flute for use with standard clockwise spindle rotation

Compatibility

Designed as a direct-fit replacement or stock tooling option for any setup requiring a wire size 3 (0.2130 inch) screw machine length drill bit with a straight shank, compatible with standard 3-jaw drill chucks and ER collet systems accepting that shank diameter.

Installation Notes

Installation and use should be performed by qualified machinists or trade technicians familiar with rotating cutting tool safety. Ensure the spindle is fully stopped and the machine is locked out before mounting or removing the bit. Secure the straight shank firmly in the chuck or collet to the minimum recommended grip depth to prevent pullout under load. Do not exceed the recommended feed and speed parameters for the workpiece material and bit diameter.