Import -20870-I Mechanics Drill Bit Letter I Hss 135

Product Description

The IMPORT -20870-I is a Letter I mechanics drill bit designed for general-purpose drilling in metal and ferrous materials. It is manufactured from high-speed steel with an oxide finish and features a 135-degree split point that reduces walking on contact and requires no center punch on most surfaces. The Weldon flat shank with three flats locks securely in compatible chuck styles to prevent slipping under torque. Overall length is 3.75 inches with a flute length of 2.25 inches. This bit is suited for production and maintenance drilling applications where consistent hole diameter of 0.272 inches is required.

This bit is intended for right-hand cutting in materials including carbon steel, cast iron, high alloy steel, high tensile strength alloy, stainless steel, and general steel stock. The mechanics length profile is shorter than a jobber bit, providing added rigidity in drill press and hand-drill applications where reduced deflection matters. The spiral flute with web-thinned, parallel web geometry helps clear chips efficiently during through-hole drilling. It is commonly used by machinists, maintenance technicians, and fabricators working with structural metals and plate stock.

Key Features

• 135-degree split point reduces walking and eliminates center-punch step on most metal surfaces
• High-speed steel construction with oxide coating for heat and wear resistance
• Weldon flat shank with three flats prevents chuck slippage under high torque
• Mechanics length for increased rigidity and reduced deflection versus jobber length
• Web-thinned parallel web improves chip evacuation in ferrous materials
• Right-hand cut, spiral flute geometry for standard drilling operations

Compatibility

Designed as a general-purpose replacement mechanics drill bit for use in drill presses, milling machines, and hand drills equipped with Weldon flat-compatible chucks or collets accepting a Weldon shank profile.

Installation Notes

Installation and use should be performed by machinists or qualified maintenance technicians following applicable shop safety procedures. Ensure the drill press or machine is fully powered down and locked out before changing bits. Secure the Weldon shank firmly in the chuck with set screws engaged against the flats before operation. Do not exceed the recommended speed range for the workpiece material and bit diameter.