Guhring 9012420042000 Screw Machine Drill Bit 0.1654in

Product Description

The GUHRING 9012420042000 is a solid carbide screw machine length drill bit designed for high-performance drilling in cast iron and steel. It measures 4.20 mm (0.1654 inches) in diameter with a 140-degree split point (SU type) and a web-thinned geometry that reduces thrust and improves centering. The overall length is 55.00 mm with a flute length of 22.00 mm, giving a compact stub-length profile suited for rigid setups. With a 3xD flute-to-diameter ratio and parallel web configuration, this bit delivers consistent chip evacuation in demanding production environments. HVAC, plumbing, and general metalworking trades rely on this type of bit for precision drilling in metal fabrication and mechanical assembly work.

This drill bit is intended for use in screw machine and CNC drilling operations where close tolerances and clean entry are required. Primary workpiece materials are cast iron and steel. The straight-cylindrical shank fits standard drill chucks and collet holders. The Series 1242 designation places it within a high-performance carbide stub drill family built to DIN 6539 standards. It is a single-piece, individually packaged tool suited for shop floor use in light manufacturing, mechanical contracting, and precision metalwork applications.

Key Features

• Solid carbide construction with submicron grade material for extended tool life in ferrous metals
• 140-degree SU split-point geometry reduces walking and minimizes burr formation
• Web-thinned, parallel web design lowers thrust force and improves hole entry
• 2-flute regular spiral configuration promotes efficient chip removal
• Coated finish for improved wear resistance and reduced friction
• Conforms to DIN 6539 specification for dimensional and geometric consistency

Compatibility

Designed for use in standard drill chucks and collet holders accepting straight-cylindrical shanks. Suitable for drilling cast iron and steel in screw machine, CNC, and manual drill press applications within the 3.50 mm to 5.00 mm diameter range.

Installation Notes

This tool should be installed by a qualified machinist or trade professional familiar with carbide tooling. Ensure the machine spindle is fully stopped and locked out before changing or inspecting the bit. Carbide is brittle — avoid lateral loading, interrupted cuts without proper support, or dropping the tool on hard surfaces. Verify shank seating and runout before beginning a drilling operation, and confirm the workpiece is securely fixtured.