Hertel 2386647 Screw Machine Drill Bit Size 57 Hss

Product Description

The HERTEL 2386647 is a screw machine length drill bit designed for high-cycle drilling in metal, plastic, and similar materials where a stubby, rigid profile is required. Built from high-speed steel with an oxide finish, it carries a wire gauge size 57 designation, corresponding to a decimal diameter of 0.0430 inches. The 135-degree split point reduces walking on entry and lowers thrust force compared to conventional 118-degree points. At 1-3/8 inches overall length with a 1/2-inch flute, this short-body geometry maximizes rigidity and minimizes deflection in screw machine, turret lathe, and CNC drilling operations. Right-hand spiral flutes evacuate chips efficiently in through-hole and blind-hole applications.

This bit is suited for production drilling environments including screw machines, turret lathes, drill presses, and CNC machining centers where a short, stiff drill is preferred over jobber-length tooling. The straight-cylindrical shank accepts standard chucks without additional toolholding. The oxide coating provides moderate lubricity and corrosion resistance during dry or lightly lubricated cutting. This is a single-piece package sold in multiples of 12, making it appropriate for toolroom stocking and high-volume replacement programs in machine shops and production facilities.

Key Features

• Wire gauge size 57 (0.0430 inches) straight-cylindrical shank for standard chuck compatibility
• 135-degree split point reduces thrust and self-centers on entry without a center punch
• Web-thinned, parallel web construction lowers cutting resistance at small diameters
• High-speed steel construction retains hardness at elevated cutting temperatures
• Oxide finish provides light lubricity and basic corrosion protection
• Screw machine length (1-3/8 inches OAL) maximizes rigidity and minimizes deflection

Compatibility

Designed as a screw machine length replacement drill bit suitable for standard chucks and collets accepting a 0.0430-inch straight-cylindrical shank in screw machine, turret lathe, and CNC drilling applications.

Installation Notes

Installation is performed by machining professionals using standard drill chucks or collet systems rated for small-diameter tooling. Ensure the machine spindle is fully stopped and locked out before changing tooling. Confirm chuck jaw condition and runout before seating small-diameter bits, as jaw wear increases deflection and breakage risk at sub-1/16-inch diameters. Coolant-through is not supported; use external flood or mist coolant if the workpiece material and cutting speed require lubrication.