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Irwin 4990 I-100 Series Solid Center Auger Bit with Cutting Spur
Model: IRW-4990
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Irwin
Starting at
$11.68
Irwin 49916 1" x 7-1/2" Solid Center Auger Bit
The Irwin 49916 1" x 7-1/2" Solid Center Auger Bit (Model #I-100) is a wood-boring bit engineered for fast, straight, and clean holes in hard and soft woods. Measuring 1" in diameter with a 4-1/2" twist length and 7-1/2" overall length, this solid-center auger bit is built for extra rigidity while boring. A coarse screw point pulls the bit through the workpiece quickly, while wide lands and a single spur cutting edge keep the bore straight and the finish smooth. Packaged individually and pouched for jobsite-ready convenience, this bit is manufactured in Brazil and supplied 24 pieces per case for retailers and trade professionals.
Key Features
- Trade Size: 1" diameter with a 4-1/2" twist length and 7-1/2" overall length for boring standard-size holes in wood.
- Durable Construction: Full-length heat-treated bit guards against bending in heavy-duty applications and strengthens the twist where the greatest strain occurs.
- Solid-Center Design: Increases durability and provides extra rigidity while boring, allowing for smooth, straight drilling.
- Wide Lands: Keep the bit straight as it bores through the hole for consistent, accurate results.
- Chip-Clearing Flutes: Flutes are ground behind the lands to funnel chips to the inside of the bit and away from the outside diameter, producing a faster, cleaner cut.
- Single Spur Cutting Edge: Scribes the circumference of the hole for a smoother finish.
- Coarse Screw Point: Provides fast boring in both hard and soft woods.
Technical Specifications
- Warranty: NLW
- Claims Needed: No
- Net Lit-Ion Y/N: No
- Battery Included: No
- Country of Origin: Brazil
- Power Source: Non-Energy Using
- Packaging: 24 ea
Typical Applications
- Woodworking and Cabinetry
- Framing and Rough Carpentry
- Doweling and Furniture Assembly
- Boring Holes for Hardware Installation
- General Construction and Renovation
Why Irwin?
Irwin engineers the 49916 auger bit with a full-length heat-treated twist and solid-center construction to guard against bending in heavy-duty boring applications. The wide-land design and single spur cutting edge work together to keep the bit straight and deliver a smoother, cleaner hole every time. For professionals and woodworkers who need dependable, fast-boring performance in hard and soft woods, Irwin's auger bit is built to hold up to repeated heavy-duty use. Backed by Irwin's reputation for dependable woodworking tools, this auger bit delivers consistent results project after project.
Manufacturer Resources
Product Specs
- list_batch:
- IRW-20260923
- Product Type:
- Wood Boring Bit
- Department:
- Electrical
- Product Subgroup:
- Drill & Driver Bits
- Product Size:
- 1" x 7-1/2"
- Product Group:
- Power Tools & Accessories
- Product Length:
- 8.3 in
- Product Width:
- 1.2 in
- Product Weight:
- 0.511 lb
- Product Height:
- 1.2 in
Irwin IRW49916 – Frequently Asked Questions
1) Will the Irwin 49916 auger bit bore deep enough for a 2x4 wall plate or a door stile?
The 49916 is 7-1/2 inches overall with a 4-1/2 inch twist length, so usable boring depth is the 4-1/2 inch twist, not the full 7-1/2 inches. That clears a doubled 2x top plate (3 inches) with room to spare and handles standard 1-3/4 inch door stiles easily. For boring through deeper built-up framing or stacked plates thicker than 4-1/2 inches, you'd want a bit extension or a longer ship auger.
2) Is the Irwin 49916 auger bit any good for hardwood, or only framing lumber?
Both. The coarse screw point is specified for fast boring in hard and soft woods, and the single spur scribes the hole circumference so the entry is clean rather than torn out, which is what matters in oak or maple. The solid center gives the shaft rigidity so it tracks straight in dense stock, and the flutes are ground behind the lands to pull chips inward and away from the hole wall. One caution from the field: a coarse screw point feeds fast and can split thin or short hardwood pieces, so back up the work and ease off at breakthrough.
3) Will the Irwin 49916 bend if I lean on it boring through framing?
The twist is heat treated full length, which Irwin specifies to guard against bending in heavy-duty boring and to strengthen the twist where strain is highest. The solid center construction adds rigidity through the body rather than leaving a hollow core. It will still bend if you pry sideways in a bound hole, so the practical rule is to let the screw point do the feeding and keep the drill square to the work.
4) Is the Irwin 49916 sold as a single bit or only in a case quantity?
Each bit is packaged individually in a pouch, and the case pack is 24 pieces. So it works either way: one bit for a service van, or the 24-count case if you are stocking a shop, a counter, or crews who go through 1 inch augers.
5) How do I order the right 1 inch Irwin auger bit, and what is the part number?
Order by Irwin part number 49916. That is the 1 inch by 7-1/2 inch solid center auger with the coarse screw point, also carrying the Model I-100 designation in Irwin's literature. Country of origin is Brazil. If someone hands you a number for a different length or diameter in the same family, the diameter and overall length are what change, so confirm 1 inch and 7-1/2 inch when you cross-reference.
6) Should I use an auger bit or a hole saw to bore 1 inch holes in studs?
For wood framing, the auger wins on speed and chip clearing. The screw point pulls itself through and the flutes eject chips, so you are not stopping to clear a plug every hole the way you do with a hole saw. A hole saw is the better choice when you need a shallow hole in sheet material, when the stock is thicker than the auger's 4-1/2 inch twist and you can cut from both faces, or when you may hit a nail, which destroys an auger's screw point and spur. For running cable through studs and plates all day, the 1 inch auger is the faster tool.
How fast can I get the Irwin IRW49916 delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the
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Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit,
reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Irwin IRW49916 come with a warranty?
Absolutely. The Irwin IRW49916 is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Irwin IRW49916?
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