Irwin 49920 Solid Center Auger Bit 1-1/4 in Hss

Product Description

The IRWIN 49920 is a solid center auger bit designed for boring and drilling operations in wood and wood-composite materials. Manufactured from high-speed steel with a bright uncoated finish, this bit features a screw-point tip that draws the bit into the material for controlled, consistent entry. The straight cylindrical shank measures 0.759 inches in diameter and 3 inches in length, providing a secure grip in compatible chucks. Overall length is 7.5 inches, with a 4.5-inch twist section that efficiently clears chips during the cut. The single cutting edge and single spur deliver clean, accurate holes in a variety of boring applications.

This auger bit is suited for residential and commercial construction, rough framing, and trade work where consistent hole quality in wood is required. Electricians, plumbers, and HVAC technicians commonly use solid center auger bits when running pipe, conduit, or wire through structural framing members. The 1.25-inch cutting diameter is a common size for through-bore work in 2x lumber and dimensional framing stock. It is sold and packaged as an individual bit.

Key Features

• Screw-point tip draws the bit into material for self-feeding, controlled entry
• High-speed steel construction for durability across repetitive boring tasks
• Bright uncoated finish — no coating buildup to interfere with chip clearance
• Single cutting edge with one spur for clean hole walls
• 7.5-inch overall length with 4.5-inch twist for adequate reach in standard framing
• Straight cylindrical shank compatible with standard drill chucks

Compatibility

Designed as a standard cylindrical-shank solid center auger bit compatible with corded and cordless drills accepting a straight shank of approximately 0.759 inches in diameter.

Installation Notes

This bit is installed by trade professionals including electricians, plumbers, and HVAC technicians when boring through wood framing. Ensure the drill is powered off and the chuck is fully tightened before beginning work. Confirm that the bore path is clear of hidden fasteners, wiring, or piping before drilling. Follow applicable NEC, IPC, or IFGC clearance and protection requirements when boring through structural members for utility runs.