Import BDNA--20925-1 Mechanics Drill Bit 29/64 Inch Hss

Product Description

The IMPORT BDNA--20925-1 is a mechanics-length drill bit designed for general-purpose metal drilling in professional and industrial settings. It measures 29/64 inch (0.4531 inch) in diameter with a 135-degree split point that reduces walking and allows drilling to start without a center punch. The bit is manufactured from high speed steel (HSS) and features an oxide finish for basic corrosion and heat resistance. The Weldon shank with three flats prevents slipping in compatible chucks. Overall length is 4-5/8 inches with a 3-inch spiral flute length. Machinists, maintenance technicians, and fabricators use this bit for through-hole and blind-hole work in ferrous metals.

This drill bit is suited for drilling carbon steel, cast iron, high alloy steel, high tensile strength alloy, stainless steel, and general steel stock. The mechanics length makes it a practical choice for confined-space drilling and bench-top drill press work where a jobber-length bit would be excessive. The right-hand cut and regular spiral flute promote efficient chip evacuation on common structural metals. It is sold individually and is well suited for maintenance, repair, and fabrication operations.

Key Features

• 29/64 inch diameter with 0.4531 inch decimal equivalent for precise sizing
• 135-degree split point reduces entry force and eliminates center-punching in many applications
• Weldon shank with 3 flats prevents chuck slip under torque
• High speed steel construction handles ferrous metal drilling at standard spindle speeds
• Web-thinned, parallel web configuration improves chip clearance and reduces thrust
• Oxide finish provides baseline heat and corrosion resistance for general shop use

Compatibility

Designed for use in drill presses and hand drills equipped with Weldon-shank or set-screw chucks accepting a 3-flat shank. Suitable for general-purpose drilling in carbon steel, cast iron, high alloy steel, high tensile strength alloy, stainless steel, and general steel workpieces.

Installation Notes

This bit is installed by a machinist or maintenance technician into a Weldon-compatible chuck or end-mill holder; tighten the set screw against one of the three flats to secure the shank before operation. Ensure the drill press or hand drill is powered off and isolated before changing bits. Do not exceed the recommended spindle speed for the workpiece material and bit diameter. Use appropriate cutting fluid on stainless and high alloy steel to extend bit life and reduce heat buildup.