Irwin 18373 Series Square Rece...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$1.97
Irwin 18373 Series Square Recess Impact Insert Bits, 2-Piece Set, 1/4" Hex Shank

Irwin 18373 Series Square Recess Impact Insert Bits, 2-Piece Set, 1/4" Hex Shank

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Model: 1837385

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

$1.97
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Irwin 18373 Series Square Recess Impact Insert Bits, 2-Piece Set, 1/4" Hex Shank

The Irwin 18373 Series Square Recess Impact Insert Bit Set pairs two 1/4" hex shank square recess insert bits engineered specifically for use with impact drivers rather than standard drills. This family is available across two matched models within the set, each manufactured from cold-forged, high-grade steel to withstand the extremely high torque output generated by impact tools, with a black oxide finish that resists corrosion and extends usable life. Precision tip geometry ensures a tight, accurate fit inside square recess fasteners, reducing slippage, stripping, and cam-out during repetitive driving tasks on the jobsite or in the shop. This set is part of Irwin's broader Impact Performance Series lineup, engineered for impact drivers rather than general-purpose drilling.

Key Features

  • Shank Diameter: 1/4" hex shank fits standard impact driver and drill/driver chucks for quick, secure bit changes.
  • Durable Construction: Cold-forged, high-grade steel construction withstands the extremely high torque output produced by impact drivers.
  • Square Recess Drive: Precision tip geometry delivers superior fitment inside square recess fasteners, reducing stripping and cam-out compared to standard bits.
  • Impact Performance Series Design: Engineered as part of Irwin's Impact Performance Series specifically for maximum durability and long life with impact drivers, not just compatibility.
  • Extended Bit Life: Forged construction, rather than the milled construction used on traditional bits, allows fasteners to fit more precisely and gives these bits up to three times longer life.
  • Corrosion-Resistant Finish: Black oxide finish resists corrosion and further increases the working life of each bit.
  • Application-Specific Engineering: Designed for repetitive impact driving rather than general-purpose drilling, helping maintain fastener engagement over time.
  • Set Configuration: Sold as a convenient 2-piece set of matching square recess impact insert bits, with two models available within this family.

Technical Specifications

  • Shank Diameter: 1/4"
  • Bit Type: Square Recess Impact Insert Bit
  • Pack Quantity: 2-Piece
  • Material: Cold-Forged, High-Grade Steel
  • Finish: Black Oxide
  • Description: Square Recess Impact Insert Bit (2-pc)

Typical Applications

  • Driving Square Recess Fasteners with Impact Drivers
  • Cabinetry, Furniture, and Woodworking Assembly
  • Deck, Framing, and General Construction
  • Professional Trade and Jobsite Fastening Tasks
  • Everyday DIY and Home Improvement Projects

Why Irwin?

Irwin engineers its Impact Performance Series bits specifically for the demanding torque loads of impact drivers rather than simply adapting standard screwdriving bits. The cold-forged, high-grade steel construction paired with a black oxide finish reflects a manufacturing approach focused on precise fastener fitment, corrosion resistance, and long-term durability that tradespeople can rely on for repetitive daily use. This 2-piece square recess set gives professionals and DIYers a matched pair of bits engineered for reliable, long-lasting performance on the jobsite or in the shop, backed by Irwin's reputation for durable, application-specific tooling.

Manufacturer Resources

Product Specs

Shank Diameter:
1/4"
Description:
Square Recess Impact Insert Bit (2-pc)
list_batch:
IRW-20260923
Product Type:
Driver Bit Set
Product Finish:
Black Oxide
Configuration:
Square Recess Drive
Series:
Impact Performance Series
Department:
Electrical
Product Subgroup:
Drill & Driver Bits
Product Material:
Steel
Product Size:
1/4"
Overall Length:
1 inch
Product Group:
Power Tools & Accessories

Irwin 1837385 – Frequently Asked Questions

1) Which square recess bit sizes come in the Irwin 18373 impact insert bit set?
Two sizes are offered: a #1 square recess set (MPN 1837379) and a #3 square recess set (MPN 1837385). Each is sold as a 2-piece pack of matching bits, so you order by the square drive number your fasteners use. If your screws are the common #2 square drive, neither of these is the right call.
2) Will these Irwin square recess bits fit my impact driver chuck?
Yes. They use a 1/4 inch hex shank, which is the standard quick-change collet size on cordless impact drivers, and the same shank drops into a drill/driver chuck or a magnetic bit holder.
3) How long are these Irwin 18373 insert bits?
Overall length is 1 inch, the standard insert bit length. That means they seat directly in an impact driver collet for tight work, or go into a magnetic bit holder when you need extra reach down into a recessed fastener or a cabinet carcass.
4) Can I use regular screwdriver bits in an impact driver instead of these?
You can, but standard milled bits are not built for the torque pulses an impact driver puts out and they snap or round off. The Irwin Impact Performance Series bits are cold-forged from high-grade steel specifically for that load, and the forged tip fits the fastener more precisely than a milled one, which Irwin rates at up to three times longer life.
5) Will a square recess bit work on Torx or Phillips screws?
No. These are square recess (Robertson) drive only, with tip geometry cut to fit square recess fasteners tightly. Phillips, Torx, or Pozi heads need their own bit profile; forcing a square bit into them cams out and chews the head.
6) Are these bits okay for outdoor deck work and damp jobsite storage?
The black oxide finish resists corrosion and extends working life, so they hold up in a truck box or a damp site better than bare steel. They are listed for deck, framing, and general construction fastening as well as cabinetry and furniture assembly.
7) Why do my square drive bits keep slipping and stripping screw heads?
Usually a loose tip fit or the wrong square size. These Irwin insert bits are made with precision tip geometry for a tight fit inside the recess, which cuts slippage, stripping, and cam-out on repetitive driving. Match the square number too: a #1 bit in a #3 recess will wobble and round the head out fast.
How fast can I get the Irwin 1837385 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 1837385 come with a warranty?
Absolutely. The Irwin 1837385 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 1837385?
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 1837385 from ZenSupply?
ZenSupply makes it easy to get the commercial door hardware you need—fast shipping, expert support, and rewards on every order. Our team is always ready to help you choose the right product for your project.
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