Irwin 1899978 DoubleLok Double...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$6.69
Irwin 1899978 DoubleLok Double-Ended Impact Driver Bit, 6-8 SL / #2PH

Irwin 1899978 DoubleLok Double-Ended Impact Driver Bit, 6-8 SL / #2PH

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Model: 1899978

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

$6.69
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Irwin 1899978 DoubleLok Double-Ended Impact Driver Bit, 6-8 SL / #2PH

The Irwin 1899978 Double-Ended Impact Driver Bit pairs a 6-8 SL slotted tip with a #2PH Phillips tip on a single cold-forged, high-grade steel shank, giving contractors and DIYers two fastening options from one compact bit. Built with Irwin's DoubleLok Technology, both ends of the bit lock securely into impact drivers and quick-change chucks, so each tip stays seated under high torque instead of slipping loose mid-drive. The Power Groove design on this bit allows compatibility with the Irwin Impact Performance Series Magnetic Screw-Hold Attachment, making one-handed fastener starts easier in tight or overhead spots. Precision-machined tip geometry delivers a tight, accurate fit inside slotted and Phillips fastener heads, reducing stripping and cam-out during repetitive high-torque driving.

Key Features

  • Double-Ended Design: Combines a 6-8 SL slotted tip and a #2PH Phillips tip on one bit, letting users switch fastener types without swapping bits mid-job.
  • DoubleLok Technology: Both ends of the bit lock securely into impact drivers and quick-change chucks, enabling use of two tips from a single bit for added convenience and extended service life.
  • Power Groove Compatibility: Engineered to work with the Irwin Impact Performance Series Magnetic Screw-Hold Attachment for faster, one-handed fastener starts.
  • Heavy-Duty Steel Construction: Manufactured from cold-forged, high-grade steel to withstand the high torque output generated by impact drivers.
  • Precision Tip Geometry: Delivers superior fitment in fastener heads, reducing stripping and cam-out for cleaner, faster driving on the jobsite.

Technical Specifications

  • Item #: 1899978
  • Bulk Item #: 1900325
  • First Tip: 6-8 SL
  • Second Tip: #2PH

Typical Applications

  • Impact Driver and Drill/Driver Fastening Tasks
  • Quick-Change Chuck Bit Holders
  • Slotted and Phillips Fastener Driving
  • Use with the Irwin Impact Performance Series Magnetic Screw-Hold Attachment
  • Professional Trade and DIY Fastening Applications

Why Irwin?

Irwin builds the 1899978 Double-Ended Impact Driver Bit from cold-forged, high-grade steel so it can stand up to the high torque output of modern impact drivers, while precision tip geometry helps keep fasteners seated tight and resistant to cam-out. DoubleLok Technology secures both ends of the bit in the chuck so users get full use out of each tip, and Power Groove compatibility with the Impact Performance Series Magnetic Screw-Hold Attachment adds convenience for one-handed starts. Together these features make the 1899978 a dependable, job-ready bit for slotted and Phillips fastening work.

Manufacturer Resources

Product Specs

list_batch:
IRW-20260923
Product Type:
Driver Bit
Department:
Electrical
Product Subgroup:
Drill & Driver Bits
Product Material:
High-Grade Steel
Product Group:
Power Tools & Accessories

Irwin 1899978 – Frequently Asked Questions

1) What tips are on the Irwin 1899978 double-ended impact bit?
The Irwin 1899978 carries a 6-8 slotted tip on one end and a #2 Phillips tip on the other, both on a single shank. That covers the two most common fastener heads on panel, device and trim work without swapping bits between drives.
2) Will a double-ended bit stay locked in an impact driver chuck, or will it work loose?
Both ends of the 1899978 are built with Irwin's DoubleLok Technology, so whichever tip is facing out, the opposite end locks into an impact driver or quick-change chuck and stays seated under high torque instead of backing out mid-drive.
3) Can I use this Irwin bit with a magnetic screw-holding attachment?
Yes. The 1899978 has Irwin's Power Groove design, which makes it compatible with the Irwin Impact Performance Series Magnetic Screw-Hold Attachment. That attachment is what makes one-handed fastener starts practical overhead or inside a panel, and it is sold separately from the bit.
4) Is this bit rated for an impact driver or just a drill/driver?
Both. The 1899978 is an impact driver bit, cold-forged from high-grade steel specifically to take the torque output of an impact driver, and it also runs fine in a standard drill/driver or a quick-change bit holder.
5) Which bit should an electrician carry for device screws and panel work, a #2 Phillips or a slotted?
Device and switch screws are commonly combination heads, which is why the 1899978 pairs both on one bit: a 6-8 slotted end sized for #6 and #8 screws and a #2 Phillips end. For an electrician flipping between receptacle screws, cover plates and panel hardware, one double-ended bit replaces two single bits in the pouch.
6) Does the Irwin 1899978 come as a single bit or in a bulk pack?
Item 1899978 is the single-bit configuration. Irwin lists 1900325 as the bulk item number for the same 6-8 SL / #2PH double-ended bit, which is the one to ask for if you are stocking a crew or an MRO crib rather than buying one.
7) Will this bit cam out of Phillips screws under high torque?
The tips on the 1899978 are precision-machined for a tight fit inside slotted and Phillips heads, which is what reduces stripping and cam-out during repetitive high-torque driving. On badly worn or painted-over screw heads no bit geometry saves the fastener, but on clean heads the fit is the point of the design.
How fast can I get the Irwin 1899978 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 1899978 come with a warranty?
Absolutely. The Irwin 1899978 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 1899978?
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 1899978 from ZenSupply?
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