Irwin 304600 Series 1-1/8" 3-C...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$38.93
Irwin 304600 Series 1-1/8" 3-Cutter Self-Feed Wood Boring Drill Bit, High Carbon Steel

Irwin 304600 Series 1-1/8" 3-Cutter Self-Feed Wood Boring Drill Bit, High Carbon Steel

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Model: 3046005

In Stock (leaves warehouse same day if ordered before 3pm ET)

$38.93
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Irwin 304600 Series 1-1/8" 3-Cutter Self-Feed Wood Boring Drill Bit, High Carbon Steel

The Irwin 304600 Series is a family of 1-1/8" 3-cutter self-feed drill bits engineered for electricians, plumbers, and contractors who need fast, clean, large-diameter holes through framing and joists. Offered as Models 3046005, 3046008, and 3046009, every bit in the series is forged in one piece from high carbon steel and fitted with a 7/16" hex quick-change impact shank that fits 1/2" or larger drills as well as 7/16" hex impact wrench drills. With three times the cutting area and edges of a standard Irwin self-feed bit, the 304600 Series drills faster and lasts longer, making it ideal for large-diameter holes in wood for pipe and conduit systems.

Key Features

  • Trade Size: 1-1/8" diameter self-feed bit for drilling large-diameter holes in wood, shared across the 304600 Series.
  • Durable Construction: Forged in one piece from high carbon steel for maximum strength under tough drilling conditions.
  • 3X Cutting Edges: Delivers three times the cutting area and edges of standard self-feed bits, extending bit life.
  • Quick-Change Shank: 7/16" hex quick-change impact shank fits 1/2" or larger drills and 7/16" hex impact wrench drills.
  • Aggressive Screw Pitch: Pulls the bit through material quickly for faster, more efficient drilling.
  • Precision Milled Shank: Eliminates run-out and wobble for accurate, true-running holes.
  • Ideal for Pipe & Conduit Systems: Sized and built for drilling clearance holes for pipe and conduit runs through wood framing.
  • Carded Packaging: Individually carded for easy identification and retail display.

Technical Specifications

  • Warranty: NLW
  • Claims Needed: No
  • Country of Origin: China
  • Battery Included: No
  • Power Source: NON-ENERGY USING

Typical Applications

  • Drilling Large-Diameter Holes in Wood
  • Pipe and Conduit Installation Systems
  • Electrical Wiring Rough-In Through Framing
  • Plumbing and HVAC Rough-In
  • Residential and Commercial Construction
  • New Construction and Renovation Projects

Why Irwin?

Irwin builds every bit in the 304600 Series as a single forged piece of high carbon steel, giving it the strength to stand up to repeated use under demanding drilling conditions. The precision milled 7/16" hex quick-change shank keeps each bit running true and eliminates run-out and wobble, while the aggressive screw pitch and 3X cutting edges keep jobs moving on site. Backed by Irwin's reputation for professional-grade cutting tools, the 304600 Series is built to perform reliably shift after shift, making it a dependable choice for contractors and tradespeople who need consistent, large-diameter holes in wood for pipe, conduit, and cable runs.

Manufacturer Resources

Product Specs

Warranty:
NLW
Claims Needed:
No
Individual Vs. Set (Syndigo):
INDIVIDUAL
Battery Included:
No
Power Source:
NON-ENERGY USING
list_batch:
IRW-20260923
Product Type:
Wood Boring Bit
Series:
304600
Configuration:
3-Cutter
Department:
Electrical
Product Subgroup:
Drill & Driver Bits
Product Material:
High Carbon Steel
Product Width:
3.7 inches
Product Group:
Power Tools & Accessories

Irwin 3046005 – Frequently Asked Questions

1) What diameters does the Irwin 304600 Series self-feed bit come in?
Three diameters are offered in the 304600 Series self-feed wood boring bits: 1-1/8 inch (model 3046005), 1-1/2 inch (model 3046008), and 1-3/4 inch (model 3046009). Pick by the pipe or conduit you're running through the framing, plus clearance.
2) Will an Irwin 304600 self-feed bit fit my impact driver or drill?
The shank is a 7/16 inch hex quick-change impact shank. It fits 1/2 inch or larger drills and 7/16 inch hex impact wrench drills. A standard 1/4 inch hex impact driver chuck will not take it, so you need either a 1/2 inch chuck drill or a 7/16 inch hex impact wrench.
3) Is a self-feed bit or a hole saw better for boring through studs and joists for conduit?
For clean, large-diameter holes through wood framing, the self-feed bit is the faster tool. Its aggressive screw pitch pulls the bit through the material instead of you having to push, and the 3-cutter head clears wood rather than trapping a plug the way a hole saw does. Hole saws are the choice when you have to cut materials other than wood or need to go through a thin panel. The 304600 Series is wood only, built for pipe, conduit, and cable runs.
4) What is the difference between the 3-cutter Irwin self-feed bit and a standard self-feed bit?
The 3-cutter head gives three times the cutting area and cutting edges of a standard Irwin self-feed bit. In practice that means it drills faster and the edges last longer between sharpenings, which matters when you are boring a whole floor of studs in one shift rather than a handful of holes.
5) Do I get one bit or a set when I order an Irwin 304600 self-feed bit?
These are sold individually, one bit per order, each one carded. If you want more than one diameter for a rough-in, order the 1-1/8, 1-1/2, and 1-3/4 inch models separately.
6) Can these self-feed bits be resharpened, and what are they made of?
Each bit is forged in one piece from high carbon steel. High carbon steel cutting edges can be filed and dressed by hand, which is why self-feed bits are usually kept in service rather than thrown away, and the one-piece forging means there is no brazed joint at the head to fail under load.
7) Will the Irwin 304600 bit wander off the mark when I start the hole?
The shank is precision milled to eliminate run-out and wobble, and the feed screw sets the center before the cutters engage, so the hole starts where you put the point and runs true. That matters on a stud bay where you need the bore centered in the framing member to keep the conduit or cable at proper depth.
8) Should a plumber use these bits or are they only for electrical work?
Both trades use them. The bits are catalogued for electrical rough-in but the application is the same for plumbing and HVAC: clearance holes through wood framing and joists for pipe, conduit, and cable. Wood only, though, not for steel studs.
How fast can I get the Irwin 3046005 delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
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 3046005 come with a warranty?
Absolutely. The Irwin 3046005 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 3046005?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
Why buy the Irwin 3046005 from ZenSupply?
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